Climate averages 1991–2020
Vĩnh Yên weather
in September.
A hot, very wet month: the 5th warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Vĩnh Yên: daytime highs average 30.4°C and nights cool to about 24.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 201 mm of rain on roughly 18 days, which makes September a very wet month (the joint 8th 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 Phúc Yên (13 km away). In September its highs average 30.3°C, about as warm as Vĩnh Yên, with 229 mm of rain.
Among the 136 cities listed in Vietnam, Vĩnh Yên ranks joint 15th of 136 for the warmest September highs and joint 13th of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Vĩnh Yên is 0.7°C warmer than that mean.
From September to October, average highs fall by 2.2°C to 28.2°C, and monthly rainfall falls from 201 mm to 100 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
Vĩnh Yên climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.2°C13.8°C | 13.8°C | 37 | 8.3 | 11.011 h |
| February | 21.4°C15.3°C | 15.3°C | 26 | 8.0 | 11.411 h |
| March | 24.6°C18.3°C | 18.3°C | 48 | 10.4 | 12.012 h |
| April | 28.6°C21.7°C | 21.7°C | 81 | 10.7 | 12.613 h |
| May | 31.0°C24.3°C | 24.3°C | 201 | 17.4 | 13.113 h |
| June | 32.3°C25.9°C | 25.9°C | 215 | 18.2 | 13.413 h |
| July | 32.0°C25.9°C | 25.9°C | 251 | 20.5 | 13.313 h |
| August | 31.4°C25.5°C | 25.5°C | 311 | 22.0 | 12.913 h |
| September, selected | 30.4°C24.3°C | 24.3°C | 201 | 17.8 | 12.312 h |
| October | 28.2°C21.8°C | 21.8°C | 100 | 10.5 | 11.712 h |
| November | 24.9°C18.3°C | 18.3°C | 48 | 6.7 | 11.111 h |
| December | 20.8°C14.5°C | 14.5°C | 29 | 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
- Phúc Yên in SeptemberVietnam · 13 kmHigh 30.3°C · Low 24.1°C · 229 mm rain
- Việt Trì in SeptemberVietnam · 21 kmHigh 30.1°C · Low 24.2°C · 201 mm rain
- Sơn Tây in SeptemberVietnam · 21 kmHigh 30.0°C · Low 24.2°C · 201 mm rain
- Sóc Sơn in SeptemberVietnam · 26 kmHigh 30.4°C · Low 24.1°C · 229 mm rain
- Bắc Từ Liêm in SeptemberVietnam · 31 kmHigh 30.2°C · Low 24.0°C · 226 mm rain
- Thành phố Sông Công in SeptemberVietnam · 31 kmHigh 30.3°C · Low 23.8°C · 227 mm rain
- Phổ Yên in SeptemberVietnam · 32 kmHigh 30.2°C · Low 23.8°C · 211 mm rain
- Ba Vì in SeptemberVietnam · 34 kmHigh 27.9°C · Low 22.2°C · 236 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 Vĩnh Yên) is explained once on the Vĩnh Yên year overview and on the Sources, method and limits page.
Việt Trì and Sơn Tây lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.