Climate averages 1991–2020
Lạng Sơn weather
in September.
A hot, wet month: the 5th 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 Lạng Sơn: daytime highs average 28.8°C and nights cool to about 22.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 164 mm of rain on roughly 18 days, which makes September a wet month (the 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 Pingxiang, China (27 km away). In September its highs average 28.0°C, 0.8°C cooler than Lạng Sơn, with 149 mm of rain.
Among the 136 cities listed in Vietnam, Lạng Sơn ranks joint 121st of 136 for the warmest September highs and 5th of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Lạng Sơn is 0.9°C cooler than that mean.
From September to October, average highs fall by 2.3°C to 26.5°C, and monthly rainfall falls from 164 mm to 75 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
Lạng Sơn climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.2°C10.8°C | 10.8°C | 57 | 11.2 | 11.011 h |
| February | 19.4°C12.6°C | 12.6°C | 44 | 10.2 | 11.411 h |
| March | 22.8°C15.9°C | 15.9°C | 79 | 14.4 | 12.012 h |
| April | 26.8°C19.8°C | 19.8°C | 97 | 14.8 | 12.613 h |
| May | 29.0°C22.6°C | 22.6°C | 220 | 21.2 | 13.213 h |
| June | 30.3°C24.4°C | 24.4°C | 257 | 23.6 | 13.413 h |
| July | 30.3°C24.6°C | 24.6°C | 270 | 24.9 | 13.313 h |
| August | 30.0°C24.1°C | 24.1°C | 285 | 25.2 | 12.913 h |
| September, selected | 28.8°C22.6°C | 22.6°C | 164 | 18.2 | 12.312 h |
| October | 26.5°C19.6°C | 19.6°C | 75 | 10.8 | 11.712 h |
| November | 23.2°C15.9°C | 15.9°C | 50 | 7.9 | 11.111 h |
| December | 18.8°C11.8°C | 11.8°C | 45 | 8.2 | 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 · 27 kmHigh 28.0°C · Low 21.5°C · 149 mm rain
- Chũ in SeptemberVietnam · 57 kmHigh 30.0°C · Low 23.4°C · 233 mm rain
- Chongzuo in SeptemberChina · 86 kmHigh 29.7°C · Low 22.9°C · 143 mm rain
- Bắc Giang in SeptemberVietnam · 87 kmHigh 30.1°C · Low 23.7°C · 230 mm rain
- Thị Trấn Đông Triều in SeptemberVietnam · 89 kmHigh 30.2°C · Low 24.1°C · 236 mm rain
- Thị Trấn Mạo Khê in SeptemberVietnam · 90 kmHigh 30.2°C · Low 24.1°C · 236 mm rain
- Việt Yên in SeptemberVietnam · 92 kmHigh 30.3°C · Low 23.8°C · 230 mm rain
- Cung Kiệm in SeptemberVietnam · 97 kmHigh 30.4°C · Low 23.9°C · 230 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 Lạng Sơn) is explained once on the Lạng Sơn year overview and on the Sources, method and limits page.