Climate averages 1991–2020
Beihai weather
in September.
A hot, very wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Beihai: daytime highs average 29.5°C and nights cool to about 25.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 267 mm of rain on roughly 19 days, which makes September a very wet month (the 9th 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 Hepu (21 km away). In September its highs average 30.1°C, 0.6°C warmer than Beihai, with 199 mm of rain.
Among the 884 cities listed in China, Beihai ranks joint 106th of 884 for the warmest September highs and 881st of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Beihai is 3.8°C warmer than that mean.
From September to October, average highs fall by 1.8°C to 27.7°C, and monthly rainfall falls from 267 mm to 89 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
Beihai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 18.5°C13.6°C | 13.6°C | 53 | 8.9 | 11.011 h |
| February | 19.9°C15.2°C | 15.2°C | 43 | 7.9 | 11.411 h |
| March | 22.9°C18.1°C | 18.1°C | 63 | 10.1 | 12.012 h |
| April | 26.3°C22.1°C | 22.1°C | 79 | 10.0 | 12.613 h |
| May | 28.9°C25.2°C | 25.2°C | 197 | 17.0 | 13.113 h |
| June | 30.0°C27.2°C | 27.2°C | 399 | 22.8 | 13.413 h |
| July | 30.2°C27.5°C | 27.5°C | 463 | 23.4 | 13.313 h |
| August | 30.0°C27.0°C | 27.0°C | 439 | 24.7 | 12.913 h |
| September, selected | 29.5°C25.8°C | 25.8°C | 267 | 19.2 | 12.312 h |
| October | 27.7°C23.2°C | 23.2°C | 89 | 9.1 | 11.712 h |
| November | 24.4°C19.3°C | 19.3°C | 55 | 7.0 | 11.111 h |
| December | 20.1°C15.0°C | 15.0°C | 45 | 6.1 | 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
- Hepu in SeptemberChina · 21 kmHigh 30.1°C · Low 24.6°C · 199 mm rain
- Xichang, China in SeptemberChina · 24 kmHigh 29.7°C · Low 25.2°C · 202 mm rain
- Gongguan in SeptemberChina · 61 kmHigh 30.2°C · Low 24.3°C · 188 mm rain
- Shankou in SeptemberChina · 64 kmHigh 29.9°C · Low 25.1°C · 200 mm rain
- Baisha (Guangxi), China in SeptemberChina · 64 kmHigh 30.1°C · Low 24.7°C · 181 mm rain
- Qinzhou in SeptemberChina · 73 kmHigh 30.0°C · Low 23.9°C · 177 mm rain
- Fangchenggang in SeptemberChina · 85 kmHigh 29.7°C · Low 24.2°C · 223 mm rain
- Móng Cái in SeptemberVietnam · 119 kmHigh 29.1°C · Low 24.9°C · 253 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 Beihai) is explained once on the Beihai year overview and on the Sources, method and limits page.