Climate averages 1991–2020
Cao Bằng weather
in September.
A hot, wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Cao Bằng: daytime highs average 29.4°C and nights cool to about 22.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 156 mm of rain on roughly 17 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 18 min on an average September day.
The nearest other city in this atlas is Pingxiang, China (81 km away). In September its highs average 28.0°C, 1.4°C cooler than Cao Bằng, with 149 mm of rain.
Among the 136 cities listed in Vietnam, Cao Bằng ranks joint 107th of 136 for the warmest September highs and 2nd of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Cao Bằng is 0.2°C cooler than that mean.
From September to October, average highs fall by 2.5°C to 26.9°C, and monthly rainfall falls from 156 mm to 87 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
Cao Bằng climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.2°C11.3°C | 11.3°C | 66 | 13.3 | 10.911 h |
| February | 19.4°C13.0°C | 13.0°C | 53 | 11.6 | 11.411 h |
| March | 22.8°C16.3°C | 16.3°C | 89 | 16.0 | 12.012 h |
| April | 26.9°C20.0°C | 20.0°C | 111 | 17.1 | 12.713 h |
| May | 29.2°C22.5°C | 22.5°C | 213 | 22.3 | 13.213 h |
| June | 30.5°C24.3°C | 24.3°C | 293 | 25.2 | 13.513 h |
| July | 30.5°C24.6°C | 24.6°C | 302 | 26.4 | 13.413 h |
| August | 30.6°C24.2°C | 24.2°C | 268 | 24.4 | 12.913 h |
| September, selected | 29.4°C22.5°C | 22.5°C | 156 | 16.8 | 12.312 h |
| October | 26.9°C19.7°C | 19.7°C | 87 | 12.0 | 11.612 h |
| November | 23.3°C15.8°C | 15.8°C | 69 | 9.7 | 11.111 h |
| December | 18.9°C11.8°C | 11.8°C | 50 | 9.4 | 10.811 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
- Pingxiang, China in SeptemberChina · 81 kmHigh 28.0°C · Low 21.5°C · 149 mm rain
- Lạng Sơn in SeptemberVietnam · 104 kmHigh 28.8°C · Low 22.6°C · 164 mm rain
- Chongzuo in SeptemberChina · 118 kmHigh 29.7°C · Low 22.9°C · 143 mm rain
- Thái Nguyên in SeptemberVietnam · 126 kmHigh 30.2°C · Low 23.6°C · 227 mm rain
- Thị Trấn Đại Từ in SeptemberVietnam · 131 kmHigh 30.5°C · Low 24.2°C · 206 mm rain
- Thành phố Sông Công in SeptemberVietnam · 139 kmHigh 30.3°C · Low 23.8°C · 227 mm rain
- Baise in SeptemberChina · 141 kmHigh 29.7°C · Low 22.4°C · 124 mm rain
- Tuyên Quang in SeptemberVietnam · 142 kmHigh 30.3°C · Low 24.2°C · 232 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 Cao Bằng) is explained once on the Cao Bằng year overview and on the Sources, method and limits page.