Climate averages 1991–2020
Long Bien weather
in September.
A hot, very wet month: the 5th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Long Bien: daytime highs average 30.3°C and nights cool to about 24.1°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 248 mm of rain on roughly 20 days, which makes September a very wet month (the 10th 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 Hanoi (6 km away). In September its highs average 30.3°C, about as warm as Long Bien, with 226 mm of rain.
Among the 136 cities listed in Vietnam, Long Bien ranks joint 28th of 136 for the warmest September highs and joint 52nd of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Long Bien is 0.6°C warmer than that mean.
From September to October, average highs fall by 2.0°C to 28.3°C, and monthly rainfall falls from 248 mm to 125 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
Long Bien climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.7°C13.6°C | 13.6°C | 37 | 7.4 | 11.011 h |
| February | 21.8°C15.2°C | 15.2°C | 26 | 6.9 | 11.411 h |
| March | 24.9°C18.1°C | 18.1°C | 50 | 10.0 | 12.012 h |
| April | 28.7°C21.6°C | 21.6°C | 87 | 10.9 | 12.613 h |
| May | 31.1°C24.3°C | 24.3°C | 232 | 18.2 | 13.113 h |
| June | 32.5°C26.0°C | 26.0°C | 241 | 19.0 | 13.413 h |
| July | 32.3°C26.1°C | 26.1°C | 280 | 21.4 | 13.313 h |
| August | 31.4°C25.4°C | 25.4°C | 350 | 24.4 | 12.913 h |
| September, selected | 30.3°C24.1°C | 24.1°C | 248 | 19.7 | 12.312 h |
| October | 28.3°C21.5°C | 21.5°C | 125 | 12.5 | 11.712 h |
| November | 25.1°C18.0°C | 18.0°C | 59 | 7.2 | 11.211 h |
| December | 21.0°C14.2°C | 14.2°C | 31 | 6.0 | 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
- Hanoi in SeptemberVietnam · 6 kmHigh 30.3°C · Low 24.1°C · 226 mm rain
- Tây Hồ in SeptemberVietnam · 10 kmHigh 30.3°C · Low 24.1°C · 226 mm rain
- Bắc Từ Liêm in SeptemberVietnam · 16 kmHigh 30.2°C · Low 24.0°C · 226 mm rain
- Thuận Thanh in SeptemberVietnam · 19 kmHigh 30.4°C · Low 24.1°C · 248 mm rain
- Mỹ Hào in SeptemberVietnam · 23 kmHigh 30.4°C · Low 24.2°C · 248 mm rain
- Bắc Ninh in SeptemberVietnam · 25 kmHigh 30.4°C · Low 24.0°C · 233 mm rain
- Sóc Sơn in SeptemberVietnam · 26 kmHigh 30.4°C · Low 24.1°C · 229 mm rain
- Phúc Yên in SeptemberVietnam · 30 kmHigh 30.3°C · Low 24.1°C · 229 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 Long Bien) is explained once on the Long Bien year overview and on the Sources, method and limits page.
Thuận Thanh and Mỹ Hào lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.