Best time to visit Cat Ba
The best time to visit Cat Ba is November–March, judged on twenty years of weather records and the events worth going for.
Cat Ba, Hai Phong, Vietnam
°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 | 18.5 °C / 65 °F | 16.1 °C / 61 °F | 43 mm / 1.7 in | best month |
| February | 19.3 °C / 67 °F | 17.1 °C / 63 °F | 25 mm / 1 in | best month |
| March | 21.6 °C / 71 °F | 19.6 °C / 67 °F | 40 mm / 1.6 in | best month |
| April | 25 °C / 77 °F | 22.8 °C / 73 °F | 59 mm / 2.3 in | good month |
| May | 28.5 °C / 83 °F | 26.1 °C / 79 °F | 169 mm / 6.7 in | neither best nor good |
| June | 30.6 °C / 87 °F | 28.3 °C / 83 °F | 219 mm / 8.6 in | neither best nor good |
| July | 30.5 °C / 87 °F | 28.1 °C / 83 °F | 322 mm / 12.7 in | neither best nor good |
| August | 30.2 °C / 86 °F | 27.5 °C / 82 °F | 423 mm / 16.7 in | neither best nor good |
| September | 29.7 °C / 85 °F | 26.7 °C / 80 °F | 359 mm / 14.1 in | neither best nor good |
| October | 27.8 °C / 82 °F | 24.8 °C / 77 °F | 177 mm / 7 in | neither best nor good |
| November | 24.8 °C / 77 °F | 21.8 °C / 71 °F | 54 mm / 2.1 in | best month |
| December | 20.6 °C / 69 °F | 17.8 °C / 64 °F | 36 mm / 1.4 in | best 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: best
- FFebruary: best
- MMarch: best
- AApril: good
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: neither
- NNovember: best
- DDecember: best
- Best
- November–March
- Good
- April
Why these months
January · best
In its favour: feels like (high) 18 °C / 64 °F, average daily high 18.5 °C / 65 °F, precipitation 43 mm / 1.7 in, share of daylight that is sunny 52%, days with heavy rain 0.8 days, wet days 7.5 days, average daily low 16.1 °C / 61 °F.
Against: relative humidity 78%.
February · best
In its favour: feels like (high) 19.7 °C / 67 °F, average daily high 19.3 °C / 67 °F, precipitation 25 mm / 1 in, share of daylight that is sunny 53%, days with heavy rain 0.5 days, wet days 6.2 days, average daily low 17.1 °C / 63 °F.
Against: relative humidity 83%.
March · best
In its favour: feels like (high) 23.5 °C / 74 °F, average daily high 21.6 °C / 71 °F, precipitation 40 mm / 1.6 in, share of daylight that is sunny 60%, days with heavy rain 0.8 days, wet days 7.8 days, average daily low 19.6 °C / 67 °F.
Against: relative humidity 86%.
April · good
In its favour: feels like (high) 28.6 °C / 83 °F, average daily high 25 °C / 77 °F, precipitation 59 mm / 2.3 in, share of daylight that is sunny 73%, days with heavy rain 1.3 days, wet days 7.8 days.
Against: relative humidity 86%, average daily low 22.8 °C / 73 °F.
November · best
In its favour: feels like (high) 26.1 °C / 79 °F, average daily high 24.8 °C / 77 °F, precipitation 54 mm / 2.1 in, share of daylight that is sunny 76%, days with heavy rain 1.1 days, wet days 8.8 days, relative humidity 74%, average daily low 21.8 °C / 71 °F.
December · best
In its favour: feels like (high) 20.1 °C / 68 °F, average daily high 20.6 °C / 69 °F, precipitation 36 mm / 1.4 in, share of daylight that is sunny 62%, days with heavy rain 0.9 days, wet days 6.5 days, average daily low 17.8 °C / 64 °F, relative humidity 72%.
Beach and swimming
Hot, dry and sunny. Penalises the monsoon hard.
- JJanuary: neither
- FFebruary: neither
- MMarch: good
- AApril: best
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: neither
- NNovember: best
- DDecember: neither
- Best
- April, November
- Good
- March
Why these months
March · good
In its favour: precipitation 40 mm / 1.6 in, share of daylight that is sunny 60%, days with heavy rain 0.8 days, wet days 7.8 days, feels like (high) 23.5 °C / 74 °F, average daily low 19.6 °C / 67 °F, wind (daily max) 20 km/h / 12 mph.
Against: average daily high 21.6 °C / 71 °F.
April · best
In its favour: share of daylight that is sunny 73%, average daily high 25 °C / 77 °F, precipitation 59 mm / 2.3 in, feels like (high) 28.6 °C / 83 °F, days with heavy rain 1.3 days, wet days 7.8 days, average daily low 22.8 °C / 73 °F, wind (daily max) 21 km/h / 13 mph.
November · best
In its favour: precipitation 54 mm / 2.1 in, share of daylight that is sunny 76%, average daily high 24.8 °C / 77 °F, feels like (high) 26.1 °C / 79 °F, days with heavy rain 1.1 days, wet days 8.8 days, average daily low 21.8 °C / 71 °F, wind (daily max) 22 km/h / 13 mph.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: best
- FFebruary: best
- MMarch: best
- AApril: good
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: neither
- NNovember: good
- DDecember: best
- Best
- December–March
- Good
- April, November
Why these months
January · best
In its favour: average daily high 18.5 °C / 65 °F, precipitation 43 mm / 1.7 in, days with heavy rain 0.8 days, wet days 7.5 days, feels like (high) 18 °C / 64 °F, share of daylight that is sunny 52%, daylight per day 11 h, wind (daily max) 21 km/h / 13 mph, average daily low 16.1 °C / 61 °F.
February · best
In its favour: average daily high 19.3 °C / 67 °F, precipitation 25 mm / 1 in, wet days 6.2 days, days with heavy rain 0.5 days, feels like (high) 19.7 °C / 67 °F, share of daylight that is sunny 53%, daylight per day 11.5 h, wind (daily max) 20 km/h / 12 mph.
Against: average daily low 17.1 °C / 63 °F.
March · best
In its favour: average daily high 21.6 °C / 71 °F, precipitation 40 mm / 1.6 in, days with heavy rain 0.8 days, wet days 7.8 days, share of daylight that is sunny 60%, daylight per day 12 h, feels like (high) 23.5 °C / 74 °F, wind (daily max) 20 km/h / 12 mph.
Against: average daily low 19.6 °C / 67 °F.
April · good
In its favour: precipitation 59 mm / 2.3 in, days with heavy rain 1.3 days, wet days 7.8 days, average daily high 25 °C / 77 °F, share of daylight that is sunny 73%, daylight per day 12.6 h, wind (daily max) 21 km/h / 13 mph.
Against: average daily low 22.8 °C / 73 °F, feels like (high) 28.6 °C / 83 °F.
November · good
In its favour: precipitation 54 mm / 2.1 in, days with heavy rain 1.1 days, average daily high 24.8 °C / 77 °F, wet days 8.8 days, share of daylight that is sunny 76%, daylight per day 11.2 h, wind (daily max) 22 km/h / 13 mph.
Against: average daily low 21.8 °C / 71 °F, feels like (high) 26.1 °C / 79 °F.
December · best
In its favour: average daily high 20.6 °C / 69 °F, precipitation 36 mm / 1.4 in, wet days 6.5 days, days with heavy rain 0.9 days, feels like (high) 20.1 °C / 68 °F, share of daylight that is sunny 62%, daylight per day 10.9 h, wind (daily max) 22 km/h / 14 mph.
Against: average daily low 17.8 °C / 64 °F.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Jade Dragon Mountain, 984 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) | 18 °C | 19.7 °C | 23.5 °C | 28.6 °C | 33.7 °C | 36.4 °C | 36.4 °C | 36.4 °C | 35.1 °C | 30.6 °C | 26.1 °C | 20.1 °C |
| Days with heavy rain | 0.8 days | 0.5 days | 0.8 days | 1.3 days | 5.2 days | 7.5 days | 10.1 days | 13.1 days | 11 days | 4.4 days | 1.1 days | 0.9 days |
| Time rain usually falls | 4 am | 7 am | 10 am | 9 am | 3 am | 3 am | 4 am | 4 am | 3 am | 4 am | 1 am | 6 am |
| Sunshine per day | 5.7 h | 6 h | 7.2 h | 9.2 h | 9.9 h | 9 h | 9.1 h | 8.1 h | 8.6 h | 8.9 h | 8.5 h | 6.8 h |
| Relative humidity | 78% | 83% | 86% | 86% | 84% | 82% | 82% | 83% | 81% | 75% | 74% | 72% |
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 | 18.9 °C | 18.9 °C | 21 °C | 25.5 °C | 29.1 °C | 31.2 °C | 31.5 °C | 31.5 °C | 30.5 °C | 28.2 °C | 25.1 °C | 21.3 °C |
| Sea temperature (daily max) 2022–2025 | 19.1 °C | 19.1 °C | 21.2 °C | 25.7 °C | 29.3 °C | 31.4 °C | 31.8 °C | 31.7 °C | 30.8 °C | 28.5 °C | 25.3 °C | 21.5 °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 | 40.9 µg/m³ | 36.5 µg/m³ | 37.4 µg/m³ | 36.3 µg/m³ | 33.9 µg/m³ | 31.6 µg/m³ | 30.6 µg/m³ | 30.4 µg/m³ | 35 µg/m³ | 26.3 µg/m³ | 23.8 µg/m³ | 30.7 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 63.7 µg/m³ | 62.2 µg/m³ | 58.8 µg/m³ | 56.9 µg/m³ | 71.1 µg/m³ | 64.8 µg/m³ | 52.4 µg/m³ | 57.4 µg/m³ | 63.6 µg/m³ | 41 µg/m³ | 37.6 µg/m³ | 45.1 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.
World Heritage sites nearby
UNESCO World Heritage sites within 25 km, nearest first.
- Ha Long Bay
24 km away