Best time to visit Half Moon Bay
The best time to visit Half Moon Bay is June–October, judged on twenty years of weather records and the events worth going for.
Half Moon Bay, California, 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 | 13.2 °C / 56 °F | 9.2 °C / 49 °F | 92 mm / 3.6 in | neither best nor good |
| February | 13.4 °C / 56 °F | 9.4 °C / 49 °F | 87 mm / 3.4 in | good month |
| March | 13.7 °C / 57 °F | 9.9 °C / 50 °F | 80 mm / 3.2 in | good month |
| April | 14.1 °C / 57 °F | 10.3 °C / 51 °F | 35 mm / 1.4 in | good month |
| May | 14.8 °C / 59 °F | 11.1 °C / 52 °F | 13 mm / 0.5 in | good month |
| June | 16.2 °C / 61 °F | 12.3 °C / 54 °F | 3 mm / 0.1 in | best month |
| July | 17 °C / 63 °F | 13.1 °C / 56 °F | 1 mm / 0 in | best month |
| August | 17.8 °C / 64 °F | 13.9 °C / 57 °F | 1 mm / 0 in | best month |
| September | 18.6 °C / 65 °F | 14.1 °C / 57 °F | 3 mm / 0.1 in | best month |
| October | 17.8 °C / 64 °F | 13.2 °C / 56 °F | 26 mm / 1 in | best month |
| November | 15.3 °C / 60 °F | 11.3 °C / 52 °F | 51 mm / 2 in | good month |
| December | 13.1 °C / 56 °F | 9.5 °C / 49 °F | 98 mm / 3.8 in | neither best nor good |
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: neither
- FFebruary: good
- MMarch: good
- AApril: good
- MMay: good
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: best
- NNovember: good
- DDecember: neither
- Best
- June–October
- Good
- February–May, November
Why these months
February · good
In its favour: share of daylight that is sunny 82%, precipitation 87 mm / 3.4 in, wet days 8.1 days, average daily high 13.4 °C / 56 °F, days with heavy rain 3.2 days, average daily low 9.4 °C / 49 °F.
Against: feels like (high) 11.2 °C / 52 °F, relative humidity 80%.
March · good
In its favour: share of daylight that is sunny 81%, precipitation 80 mm / 3.2 in, average daily high 13.7 °C / 57 °F, days with heavy rain 3.2 days, wet days 10 days, average daily low 9.9 °C / 50 °F.
Against: feels like (high) 11.7 °C / 53 °F, relative humidity 80%.
April · good
In its favour: precipitation 35 mm / 1.4 in, share of daylight that is sunny 87%, feels like (high) 12.6 °C / 55 °F, wet days 4.6 days, days with heavy rain 1.2 days, average daily high 14.1 °C / 57 °F, average daily low 10.3 °C / 51 °F.
Against: relative humidity 80%.
May · good
In its favour: precipitation 13 mm / 0.5 in, share of daylight that is sunny 90%, feels like (high) 13.7 °C / 57 °F, wet days 2.3 days, days with heavy rain 0.3 days, average daily high 14.8 °C / 59 °F, average daily low 11.1 °C / 52 °F.
Against: relative humidity 82%.
June · best
In its favour: feels like (high) 15.8 °C / 60 °F, precipitation 3 mm / 0.1 in, share of daylight that is sunny 90%, average daily high 16.2 °C / 61 °F, wet days 0.5 days, days with heavy rain 0.1 days, average daily low 12.3 °C / 54 °F.
Against: relative humidity 83%.
July · best
In its favour: feels like (high) 17.2 °C / 63 °F, precipitation 1 mm / 0 in, share of daylight that is sunny 90%, average daily high 17 °C / 63 °F, wet days 0.1 days, days with heavy rain 0 days, average daily low 13.1 °C / 56 °F.
Against: relative humidity 85%.
August · best
In its favour: feels like (high) 18.2 °C / 65 °F, precipitation 1 mm / 0 in, share of daylight that is sunny 91%, average daily high 17.8 °C / 64 °F, wet days 0.1 days, days with heavy rain 0 days, average daily low 13.9 °C / 57 °F.
Against: relative humidity 85%.
September · best
In its favour: feels like (high) 18.5 °C / 65 °F, average daily high 18.6 °C / 65 °F, precipitation 3 mm / 0.1 in, share of daylight that is sunny 93%, wet days 0.7 days, days with heavy rain 0.1 days, average daily low 14.1 °C / 57 °F.
Against: relative humidity 83%.
October · best
In its favour: feels like (high) 16.8 °C / 62 °F, precipitation 26 mm / 1 in, share of daylight that is sunny 87%, average daily high 17.8 °C / 64 °F, wet days 3.1 days, days with heavy rain 0.7 days, average daily low 13.2 °C / 56 °F.
Against: relative humidity 80%.
November · good
In its favour: precipitation 51 mm / 2 in, share of daylight that is sunny 84%, feels like (high) 13.7 °C / 57 °F, wet days 6.2 days, average daily high 15.3 °C / 60 °F, days with heavy rain 1.4 days, average daily low 11.3 °C / 52 °F.
Against: relative humidity 81%.
Beach and swimming
Hot, dry and sunny. Penalises the monsoon hard.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: neither
- NNovember: neither
- DDecember: neither
No month is good for this in Half Moon Bay.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: best
- FFebruary: best
- MMarch: best
- AApril: best
- MMay: best
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: best
- NNovember: best
- DDecember: best
- Best
- January–December
Why these months
January · best
In its favour: average daily high 13.2 °C / 56 °F, precipitation 92 mm / 3.6 in, wet days 8.4 days, feels like (high) 11.1 °C / 52 °F, average daily low 9.2 °C / 49 °F, share of daylight that is sunny 76%, days with heavy rain 3.4 days, wind (daily max) 19 km/h / 12 mph.
Against: daylight per day 9.9 h.
February · best
In its favour: average daily high 13.4 °C / 56 °F, precipitation 87 mm / 3.4 in, wet days 8.1 days, feels like (high) 11.2 °C / 52 °F, average daily low 9.4 °C / 49 °F, share of daylight that is sunny 82%, days with heavy rain 3.2 days, daylight per day 10.8 h, wind (daily max) 22 km/h / 13 mph.
March · best
In its favour: average daily high 13.7 °C / 57 °F, precipitation 80 mm / 3.2 in, feels like (high) 11.7 °C / 53 °F, average daily low 9.9 °C / 50 °F, share of daylight that is sunny 81%, daylight per day 12 h, wet days 10 days, days with heavy rain 3.2 days, wind (daily max) 22 km/h / 14 mph.
April · best
In its favour: average daily high 14.1 °C / 57 °F, precipitation 35 mm / 1.4 in, wet days 4.6 days, days with heavy rain 1.2 days, feels like (high) 12.6 °C / 55 °F, average daily low 10.3 °C / 51 °F, share of daylight that is sunny 87%, daylight per day 13.2 h, wind (daily max) 23 km/h / 14 mph.
May · best
In its favour: average daily high 14.8 °C / 59 °F, precipitation 13 mm / 0.5 in, wet days 2.3 days, days with heavy rain 0.3 days, feels like (high) 13.7 °C / 57 °F, average daily low 11.1 °C / 52 °F, share of daylight that is sunny 90%, daylight per day 14.2 h, wind (daily max) 23 km/h / 14 mph.
June · best
In its favour: average daily high 16.2 °C / 61 °F, precipitation 3 mm / 0.1 in, wet days 0.5 days, days with heavy rain 0.1 days, feels like (high) 15.8 °C / 60 °F, average daily low 12.3 °C / 54 °F, share of daylight that is sunny 90%, daylight per day 14.7 h, wind (daily max) 22 km/h / 13 mph.
July · best
In its favour: average daily high 17 °C / 63 °F, precipitation 1 mm / 0 in, wet days 0.1 days, days with heavy rain 0 days, feels like (high) 17.2 °C / 63 °F, average daily low 13.1 °C / 56 °F, share of daylight that is sunny 90%, daylight per day 14.4 h, wind (daily max) 19 km/h / 11 mph.
August · best
In its favour: average daily high 17.8 °C / 64 °F, precipitation 1 mm / 0 in, wet days 0.1 days, days with heavy rain 0 days, feels like (high) 18.2 °C / 65 °F, average daily low 13.9 °C / 57 °F, share of daylight that is sunny 91%, daylight per day 13.6 h, wind (daily max) 18 km/h / 11 mph.
September · best
In its favour: average daily high 18.6 °C / 65 °F, precipitation 3 mm / 0.1 in, wet days 0.7 days, days with heavy rain 0.1 days, feels like (high) 18.5 °C / 65 °F, share of daylight that is sunny 93%, daylight per day 12.4 h, average daily low 14.1 °C / 57 °F, wind (daily max) 18 km/h / 11 mph.
October · best
In its favour: average daily high 17.8 °C / 64 °F, precipitation 26 mm / 1 in, wet days 3.1 days, days with heavy rain 0.7 days, feels like (high) 16.8 °C / 62 °F, average daily low 13.2 °C / 56 °F, share of daylight that is sunny 87%, daylight per day 11.2 h, wind (daily max) 18 km/h / 11 mph.
November · best
In its favour: average daily high 15.3 °C / 60 °F, precipitation 51 mm / 2 in, wet days 6.2 days, days with heavy rain 1.4 days, feels like (high) 13.7 °C / 57 °F, average daily low 11.3 °C / 52 °F, share of daylight that is sunny 84%, wind (daily max) 18 km/h / 11 mph, daylight per day 10.2 h.
December · best
In its favour: average daily high 13.1 °C / 56 °F, precipitation 98 mm / 3.8 in, feels like (high) 11.1 °C / 52 °F, average daily low 9.5 °C / 49 °F, wet days 9.8 days, share of daylight that is sunny 74%, days with heavy rain 3.4 days, wind (daily max) 20 km/h / 12 mph.
Against: daylight per day 9.6 h.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Dodge Ridge Ski Area, 233 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) | 11.1 °C | 11.2 °C | 11.7 °C | 12.6 °C | 13.7 °C | 15.8 °C | 17.2 °C | 18.2 °C | 18.5 °C | 16.8 °C | 13.7 °C | 11.1 °C |
| Days with heavy rain | 3.4 days | 3.2 days | 3.2 days | 1.2 days | 0.3 days | 0.1 days | 0 days | 0 days | 0.1 days | 0.7 days | 1.4 days | 3.4 days |
| Time rain usually falls | 5 pm | 7 am | 12 pm | 6 am | 1 pm | 10 am | 12 pm | 12 pm | 1 pm | 5 pm | 12 pm | 4 am |
| Sunshine per day | 7.5 h | 8.8 h | 9.7 h | 11.5 h | 12.8 h | 13.2 h | 13 h | 12.3 h | 11.5 h | 9.8 h | 8.5 h | 7.1 h |
| Relative humidity | 81% | 80% | 80% | 80% | 82% | 83% | 85% | 85% | 83% | 80% | 81% | 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 | 12.6 °C | 12.4 °C | 12 °C | 11.8 °C | 12 °C | 13 °C | 13.9 °C | 14.6 °C | 15.7 °C | 15.2 °C | 13.4 °C | 13 °C |
| Sea temperature (daily max) 2022–2025 | 12.7 °C | 12.6 °C | 12.2 °C | 12.1 °C | 12.3 °C | 13.3 °C | 14.2 °C | 14.8 °C | 15.9 °C | 15.4 °C | 13.5 °C | 13.2 °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 | 13.1 µg/m³ | 13.9 µg/m³ | 11.2 µg/m³ | 11.2 µg/m³ | 9.7 µg/m³ | 10.1 µg/m³ | 8.9 µg/m³ | 9.1 µg/m³ | 10.4 µg/m³ | 11.3 µg/m³ | 13.8 µg/m³ | 16.4 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 20.6 µg/m³ | 21.7 µg/m³ | 16.4 µg/m³ | 15.4 µg/m³ | 13.1 µg/m³ | 13.2 µg/m³ | 11.9 µg/m³ | 12.9 µg/m³ | 15.1 µg/m³ | 17.2 µg/m³ | 21.1 µg/m³ | 24.9 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.