Best time to visit Kauai
The best time to visit Kauai is June–September, judged on twenty years of weather records and the events worth going for.
Kauai, Hawaii, United States
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 23.6 °C / 74 °F | 19.5 °C / 67 °F | 49 mm / 1.9 in | good month |
| February | 23.2 °C / 74 °F | 19.1 °C / 66 °F | 58 mm / 2.3 in | good month |
| March | 23.4 °C / 74 °F | 19.3 °C / 67 °F | 98 mm / 3.9 in | good month |
| April | 24.2 °C / 76 °F | 20.1 °C / 68 °F | 56 mm / 2.2 in | good month |
| May | 25.2 °C / 77 °F | 20.9 °C / 70 °F | 55 mm / 2.2 in | good month |
| June | 26.2 °C / 79 °F | 21.9 °C / 71 °F | 41 mm / 1.6 in | best month |
| July | 26.8 °C / 80 °F | 22.6 °C / 73 °F | 34 mm / 1.4 in | best month |
| August | 27.3 °C / 81 °F | 22.9 °C / 73 °F | 43 mm / 1.7 in | best month |
| September | 27.3 °C / 81 °F | 22.9 °C / 73 °F | 39 mm / 1.5 in | best month |
| October | 26.6 °C / 80 °F | 22.4 °C / 72 °F | 55 mm / 2.2 in | good month |
| November | 25.3 °C / 78 °F | 21.5 °C / 71 °F | 56 mm / 2.2 in | good month |
| December | 24.2 °C / 76 °F | 20.4 °C / 69 °F | 83 mm / 3.2 in | good month |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: good
- FFebruary: good
- MMarch: good
- AApril: good
- MMay: good
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: good
- NNovember: good
- DDecember: good
- Best
- June–September
- Good
- October–May
Kauai stays warm and humid all year, and rain leans toward afternoon showers most months; the trade-wind dry season from June to September, with the lightest heavy rain, is best, while March and December are the rainiest and only good.
Why these months
January · good
In its favour: feels like (high) 24.8 °C / 77 °F, average daily high 23.6 °C / 74 °F, precipitation 49 mm / 1.9 in, share of daylight that is sunny 92%, days with heavy rain 0.9 days, average daily low 19.5 °C / 67 °F.
Against: relative humidity 80%, wet days 9.9 days, share of rain falling in the daytime 54%.
Also on: Whale watching.
February · good
In its favour: feels like (high) 24.5 °C / 76 °F, average daily high 23.2 °C / 74 °F, precipitation 58 mm / 2.3 in, share of daylight that is sunny 91%, average daily low 19.1 °C / 66 °F.
Against: wet days 11.8 days, relative humidity 79%, days with heavy rain 1.1 days, share of rain falling in the daytime 48%.
Also on: Whale watching.
March · good
In its favour: feels like (high) 25.1 °C / 77 °F, average daily high 23.4 °C / 74 °F, share of daylight that is sunny 90%, average daily low 19.3 °C / 67 °F.
Against: wet days 14.9 days, relative humidity 80%, precipitation 98 mm / 3.9 in, days with heavy rain 1.9 days, share of rain falling in the daytime 53%.
Also on: Whale watching.
April · good
In its favour: feels like (high) 26.4 °C / 80 °F, average daily high 24.2 °C / 76 °F, precipitation 56 mm / 2.2 in, share of daylight that is sunny 93%, days with heavy rain 0.6 days, average daily low 20.1 °C / 68 °F.
Against: wet days 15.8 days, relative humidity 80%, share of rain falling in the daytime 61%.
May · good
In its favour: feels like (high) 28 °C / 82 °F, average daily high 25.2 °C / 77 °F, precipitation 55 mm / 2.2 in, share of daylight that is sunny 95%, days with heavy rain 1 days, average daily low 20.9 °C / 70 °F.
Against: wet days 15.2 days, relative humidity 79%, share of rain falling in the daytime 62%.
June · best
In its favour: feels like (high) 29.1 °C / 84 °F, precipitation 41 mm / 1.6 in, share of daylight that is sunny 95%, average daily high 26.2 °C / 79 °F, days with heavy rain 0.3 days, average daily low 21.9 °C / 71 °F.
Against: wet days 13.7 days, relative humidity 78%, share of rain falling in the daytime 56%.
July · best
In its favour: precipitation 34 mm / 1.4 in, share of daylight that is sunny 95%, average daily high 26.8 °C / 80 °F, feels like (high) 29.9 °C / 86 °F, days with heavy rain 0.1 days.
Against: wet days 14.8 days, relative humidity 79%, share of rain falling in the daytime 57%, average daily low 22.6 °C / 73 °F.
August · best
In its favour: precipitation 43 mm / 1.7 in, share of daylight that is sunny 96%, average daily high 27.3 °C / 81 °F, days with heavy rain 0.5 days.
Against: feels like (high) 30.6 °C / 87 °F, wet days 13.6 days, relative humidity 78%, share of rain falling in the daytime 55%, average daily low 22.9 °C / 73 °F.
September · best
In its favour: precipitation 39 mm / 1.5 in, share of daylight that is sunny 94%, average daily high 27.3 °C / 81 °F, days with heavy rain 0.3 days.
Against: feels like (high) 30.6 °C / 87 °F, wet days 14.2 days, relative humidity 78%, share of rain falling in the daytime 58%, average daily low 22.9 °C / 73 °F.
October · good
In its favour: precipitation 55 mm / 2.2 in, share of daylight that is sunny 92%, feels like (high) 29.7 °C / 85 °F, average daily high 26.6 °C / 80 °F, days with heavy rain 0.5 days.
Against: wet days 14.9 days, relative humidity 80%, share of rain falling in the daytime 59%, average daily low 22.4 °C / 72 °F.
November · good
In its favour: feels like (high) 27.3 °C / 81 °F, average daily high 25.3 °C / 78 °F, precipitation 56 mm / 2.2 in, share of daylight that is sunny 95%, average daily low 21.5 °C / 71 °F.
Against: wet days 13.4 days, relative humidity 80%, days with heavy rain 0.8 days, share of rain falling in the daytime 49%.
December · good
In its favour: feels like (high) 25.7 °C / 78 °F, average daily high 24.2 °C / 76 °F, share of daylight that is sunny 92%, average daily low 20.4 °C / 69 °F.
Against: wet days 13.6 days, relative humidity 81%, precipitation 83 mm / 3.2 in, days with heavy rain 1.6 days.
Also on: Whale watching.
Beach and swimming
Hot, dry and sunny. Penalises the monsoon hard.
- JJanuary: good
- FFebruary: good
- MMarch: good
- AApril: good
- MMay: good
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: good
- NNovember: good
- DDecember: good
- Best
- June–September
- Good
- October–May
Sea temperatures stay warm (24.5-27.7C) and air never gets hot enough to hurt a beach day, so the whole year is at least good; June through September are driest and best, while March and December see the heaviest, most frequent showers.
Why these months
January · good
In its favour: precipitation 49 mm / 1.9 in, share of daylight that is sunny 92%, days with heavy rain 0.9 days, average daily high 23.6 °C / 74 °F, feels like (high) 24.8 °C / 77 °F, average daily low 19.5 °C / 67 °F, wind (daily max) 16 km/h / 10 mph.
Against: wet days 9.9 days, share of rain falling in the daytime 54%.
Also on: Whale watching.
February · good
In its favour: precipitation 58 mm / 2.3 in, share of daylight that is sunny 91%, average daily high 23.2 °C / 74 °F, feels like (high) 24.5 °C / 76 °F, average daily low 19.1 °C / 66 °F, wind (daily max) 16 km/h / 10 mph.
Against: wet days 11.8 days, days with heavy rain 1.1 days, share of rain falling in the daytime 48%.
Also on: Whale watching.
March · good
In its favour: share of daylight that is sunny 90%, average daily high 23.4 °C / 74 °F, feels like (high) 25.1 °C / 77 °F, average daily low 19.3 °C / 67 °F, wind (daily max) 17 km/h / 10 mph.
Against: wet days 14.9 days, precipitation 98 mm / 3.9 in, days with heavy rain 1.9 days, share of rain falling in the daytime 53%.
Also on: Whale watching.
April · good
In its favour: precipitation 56 mm / 2.2 in, share of daylight that is sunny 93%, average daily high 24.2 °C / 76 °F, feels like (high) 26.4 °C / 80 °F, days with heavy rain 0.6 days, average daily low 20.1 °C / 68 °F, wind (daily max) 17 km/h / 10 mph.
Against: wet days 15.8 days, share of rain falling in the daytime 61%.
May · good
In its favour: average daily high 25.2 °C / 77 °F, precipitation 55 mm / 2.2 in, share of daylight that is sunny 95%, feels like (high) 28 °C / 82 °F, days with heavy rain 1 days, average daily low 20.9 °C / 70 °F, wind (daily max) 15 km/h / 9 mph.
Against: wet days 15.2 days, share of rain falling in the daytime 62%.
June · best
In its favour: average daily high 26.2 °C / 79 °F, precipitation 41 mm / 1.6 in, share of daylight that is sunny 95%, feels like (high) 29.1 °C / 84 °F, days with heavy rain 0.3 days, average daily low 21.9 °C / 71 °F, wind (daily max) 17 km/h / 10 mph.
Against: wet days 13.7 days, share of rain falling in the daytime 56%.
July · best
In its favour: average daily high 26.8 °C / 80 °F, precipitation 34 mm / 1.4 in, share of daylight that is sunny 95%, feels like (high) 29.9 °C / 86 °F, days with heavy rain 0.1 days, average daily low 22.6 °C / 73 °F, wind (daily max) 17 km/h / 11 mph.
Against: wet days 14.8 days, share of rain falling in the daytime 57%.
August · best
In its favour: average daily high 27.3 °C / 81 °F, precipitation 43 mm / 1.7 in, share of daylight that is sunny 96%, feels like (high) 30.6 °C / 87 °F, days with heavy rain 0.5 days, average daily low 22.9 °C / 73 °F, wind (daily max) 16 km/h / 10 mph.
Against: wet days 13.6 days, share of rain falling in the daytime 55%.
September · best
In its favour: average daily high 27.3 °C / 81 °F, precipitation 39 mm / 1.5 in, share of daylight that is sunny 94%, feels like (high) 30.6 °C / 87 °F, days with heavy rain 0.3 days, average daily low 22.9 °C / 73 °F, wind (daily max) 15 km/h / 9 mph.
Against: wet days 14.2 days, share of rain falling in the daytime 58%.
October · good
In its favour: average daily high 26.6 °C / 80 °F, precipitation 55 mm / 2.2 in, share of daylight that is sunny 92%, feels like (high) 29.7 °C / 85 °F, days with heavy rain 0.5 days, average daily low 22.4 °C / 72 °F, wind (daily max) 14 km/h / 9 mph.
Against: wet days 14.9 days, share of rain falling in the daytime 59%.
November · good
In its favour: average daily high 25.3 °C / 78 °F, precipitation 56 mm / 2.2 in, share of daylight that is sunny 95%, feels like (high) 27.3 °C / 81 °F, average daily low 21.5 °C / 71 °F, wind (daily max) 16 km/h / 10 mph.
Against: wet days 13.4 days, days with heavy rain 0.8 days, share of rain falling in the daytime 49%.
December · good
In its favour: share of daylight that is sunny 92%, average daily high 24.2 °C / 76 °F, feels like (high) 25.7 °C / 78 °F, average daily low 20.4 °C / 69 °F, wind (daily max) 16 km/h / 10 mph.
Against: wet days 13.6 days, precipitation 83 mm / 3.2 in, days with heavy rain 1.6 days.
Also on: Whale watching.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: good
- FFebruary: good
- MMarch: neither
- AApril: good
- MMay: good
- JJune: best
- JJuly: best
- AAugust: good
- SSeptember: good
- OOctober: good
- NNovember: good
- DDecember: neither
- Best
- June–July
- Good
- January–February, April–May, August–November
June and July are driest and mild enough for best hiking; August and September stay dry but turn hotter and muggier, while March and December's heaviest rain and most afternoon downpours make trails too wet to be good.
Why these months
January · good
In its favour: precipitation 49 mm / 1.9 in, average daily high 23.6 °C / 74 °F, days with heavy rain 0.9 days, share of daylight that is sunny 92%, daylight per day 11 h, wind (daily max) 16 km/h / 10 mph, feels like (high) 24.8 °C / 77 °F.
Against: wet days 9.9 days, share of rain falling in the daytime 54%, relative humidity 80%, average daily low 19.5 °C / 67 °F.
Also on: Whale watching.
February · good
In its favour: precipitation 58 mm / 2.3 in, average daily high 23.2 °C / 74 °F, share of daylight that is sunny 91%, daylight per day 11.4 h, feels like (high) 24.5 °C / 76 °F, wind (daily max) 16 km/h / 10 mph.
Against: wet days 11.8 days, days with heavy rain 1.1 days, share of rain falling in the daytime 48%, relative humidity 79%, average daily low 19.1 °C / 66 °F.
Also on: Whale watching.
April · good
In its favour: precipitation 56 mm / 2.2 in, average daily high 24.2 °C / 76 °F, days with heavy rain 0.6 days, share of daylight that is sunny 93%, daylight per day 12.7 h, wind (daily max) 17 km/h / 10 mph.
Against: wet days 15.8 days, share of rain falling in the daytime 61%, relative humidity 80%, average daily low 20.1 °C / 68 °F, feels like (high) 26.4 °C / 80 °F.
May · good
In its favour: precipitation 55 mm / 2.2 in, days with heavy rain 1 days, average daily high 25.2 °C / 77 °F, share of daylight that is sunny 95%, daylight per day 13.2 h, wind (daily max) 15 km/h / 9 mph.
Against: wet days 15.2 days, share of rain falling in the daytime 62%, relative humidity 79%, average daily low 20.9 °C / 70 °F, feels like (high) 28 °C / 82 °F.
June · best
In its favour: precipitation 41 mm / 1.6 in, days with heavy rain 0.3 days, share of daylight that is sunny 95%, daylight per day 13.5 h, wind (daily max) 17 km/h / 10 mph.
Against: wet days 13.7 days, relative humidity 78%, share of rain falling in the daytime 56%, average daily high 26.2 °C / 79 °F, average daily low 21.9 °C / 71 °F, feels like (high) 29.1 °C / 84 °F.
July · best
In its favour: precipitation 34 mm / 1.4 in, days with heavy rain 0.1 days, share of daylight that is sunny 95%, daylight per day 13.3 h, wind (daily max) 17 km/h / 11 mph.
Against: wet days 14.8 days, relative humidity 79%, share of rain falling in the daytime 57%, average daily high 26.8 °C / 80 °F, average daily low 22.6 °C / 73 °F, feels like (high) 29.9 °C / 86 °F.
August · good
In its favour: precipitation 43 mm / 1.7 in, days with heavy rain 0.5 days, share of daylight that is sunny 96%, daylight per day 12.9 h, wind (daily max) 16 km/h / 10 mph.
Against: average daily high 27.3 °C / 81 °F, feels like (high) 30.6 °C / 87 °F, wet days 13.6 days, relative humidity 78%, share of rain falling in the daytime 55%, average daily low 22.9 °C / 73 °F.
September · good
In its favour: precipitation 39 mm / 1.5 in, days with heavy rain 0.3 days, share of daylight that is sunny 94%, daylight per day 12.3 h, wind (daily max) 15 km/h / 9 mph.
Against: average daily high 27.3 °C / 81 °F, feels like (high) 30.6 °C / 87 °F, wet days 14.2 days, relative humidity 78%, share of rain falling in the daytime 58%, average daily low 22.9 °C / 73 °F.
October · good
In its favour: precipitation 55 mm / 2.2 in, days with heavy rain 0.5 days, share of daylight that is sunny 92%, daylight per day 11.6 h, wind (daily max) 14 km/h / 9 mph.
Against: wet days 14.9 days, share of rain falling in the daytime 59%, relative humidity 80%, average daily high 26.6 °C / 80 °F, average daily low 22.4 °C / 72 °F, feels like (high) 29.7 °C / 85 °F.
November · good
In its favour: precipitation 56 mm / 2.2 in, average daily high 25.3 °C / 78 °F, share of daylight that is sunny 95%, daylight per day 11.1 h, wind (daily max) 16 km/h / 10 mph.
Against: wet days 13.4 days, days with heavy rain 0.8 days, share of rain falling in the daytime 49%, relative humidity 80%, average daily low 21.5 °C / 71 °F, feels like (high) 27.3 °C / 81 °F.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Mount Ashland, 4073 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 24.8 °C | 24.5 °C | 25.1 °C | 26.4 °C | 28 °C | 29.1 °C | 29.9 °C | 30.6 °C | 30.6 °C | 29.7 °C | 27.3 °C | 25.7 °C |
| Days with heavy rain | 0.9 days | 1.1 days | 1.9 days | 0.6 days | 1 days | 0.3 days | 0.1 days | 0.5 days | 0.3 days | 0.5 days | 0.8 days | 1.6 days |
| Time rain usually falls | 4 pm | 4 pm | 3 pm | 4 pm | 3 pm | 2 pm | 4 pm | 4 pm | 2 pm | 3 pm | 3 pm | 7 am |
| Sunshine per day | 10.1 h | 10.4 h | 10.8 h | 11.8 h | 12.6 h | 12.8 h | 12.7 h | 12.4 h | 11.6 h | 10.7 h | 10.5 h | 10 h |
| Relative humidity | 80% | 79% | 80% | 80% | 79% | 78% | 79% | 78% | 78% | 80% | 80% | 81% |
Sea temperature
Averaged over a shorter period (2022–2025) than the twenty-year averages above.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature 2022–2025 | 25 °C | 24.5 °C | 24.6 °C | 25 °C | 25.7 °C | 26.5 °C | 26.8 °C | 27.3 °C | 27.7 °C | 27.6 °C | 26.7 °C | 25.9 °C |
| Sea temperature (daily max) 2022–2025 | 25.1 °C | 24.7 °C | 24.7 °C | 25.2 °C | 25.9 °C | 26.6 °C | 27 °C | 27.5 °C | 27.8 °C | 27.8 °C | 26.8 °C | 26 °C |
- Very cold 10 °C or less
- Cold 10 to 15 °C
- Cool 15 to 20 °C
- Comfortable 20 to 25 °C
- Warm 25 to 28 °C
- Very warm over 28 °C
The words describe how the water feels to swim in. They are ours, not an official standard.
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 4.6 µg/m³ | 5.9 µg/m³ | 5.8 µg/m³ | 5.7 µg/m³ | 5.4 µg/m³ | 5.3 µg/m³ | 5.4 µg/m³ | 5 µg/m³ | 4.4 µg/m³ | 4.1 µg/m³ | 4.9 µg/m³ | 4.5 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 6.5 µg/m³ | 7.9 µg/m³ | 7.8 µg/m³ | 7.7 µg/m³ | 7.2 µg/m³ | 7 µg/m³ | 7 µg/m³ | 6.4 µg/m³ | 5.9 µg/m³ | 5.7 µg/m³ | 6.6 µg/m³ | 6.3 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.
Events and seasons
What the weather records cannot show. A major event can lift a month to good or best. The warnings are there to help you plan, and never count against a month.
Reasons to go
- Whale watching
January, February, March and December