Climate averages 1991–2020
Haiphong weather
in September.
A hot, very wet month: the 5th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Haiphong: daytime highs average 29.9°C and nights cool to about 24.4°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 290 mm of rain on roughly 20 days, which makes September a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 17 min on an average September day.
The nearest other city in this atlas is Kiến An (9 km away). In September its highs average 29.7°C, about as warm as Haiphong, with 290 mm of rain.
Among the 136 cities listed in Vietnam, Haiphong ranks joint 75th of 136 for the warmest September highs and joint 91st of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Haiphong is 0.2°C warmer than that mean.
From September to October, average highs fall by 1.8°C to 28.1°C, and monthly rainfall falls from 290 mm to 133 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Haiphong climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.6°C13.9°C | 13.9°C | 37 | 7.0 | 11.011 h |
| February | 21.2°C15.4°C | 15.4°C | 22 | 5.6 | 11.411 h |
| March | 24.0°C18.3°C | 18.3°C | 39 | 7.6 | 12.012 h |
| April | 27.6°C21.8°C | 21.8°C | 57 | 8.4 | 12.613 h |
| May | 30.1°C24.7°C | 24.7°C | 207 | 16.9 | 13.113 h |
| June | 31.6°C26.6°C | 26.6°C | 214 | 18.3 | 13.413 h |
| July | 31.5°C26.6°C | 26.6°C | 281 | 20.1 | 13.313 h |
| August | 30.8°C25.8°C | 25.8°C | 381 | 24.4 | 12.813 h |
| September, selected | 29.9°C24.4°C | 24.4°C | 290 | 20.0 | 12.312 h |
| October | 28.1°C21.9°C | 21.9°C | 133 | 12.4 | 11.712 h |
| November | 25.1°C18.5°C | 18.5°C | 60 | 8.2 | 11.211 h |
| December | 21.1°C14.7°C | 14.7°C | 37 | 6.5 | 10.911 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Kiến An in SeptemberVietnam · 9 kmHigh 29.7°C · Low 24.7°C · 290 mm rain
- Thị Trấn Mạo Khê in SeptemberVietnam · 24 kmHigh 30.2°C · Low 24.1°C · 236 mm rain
- Thị Trấn Đông Triều in SeptemberVietnam · 30 kmHigh 30.2°C · Low 24.1°C · 236 mm rain
- Hải Dương in SeptemberVietnam · 37 kmHigh 30.2°C · Low 24.2°C · 243 mm rain
- Hạ Long in SeptemberVietnam · 42 kmHigh 29.6°C · Low 25.0°C · 243 mm rain
- Chí Linh in SeptemberVietnam · 44 kmHigh 30.3°C · Low 24.1°C · 243 mm rain
- Chũ in SeptemberVietnam · 58 kmHigh 30.0°C · Low 23.4°C · 233 mm rain
- Mỹ Hào in SeptemberVietnam · 63 kmHigh 30.4°C · Low 24.2°C · 248 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Haiphong) is explained once on the Haiphong year overview and on the Sources, method and limits page.
Kiến An lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.