Climate averages 1991–2020
Haikou, China weather
in September.
A mild, wet month: the 6th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Haikou, China: daytime highs average 21.6°C and nights cool to about 15.9°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 147 mm of rain on roughly 20 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 19 min on an average September day.
The nearest other city in this atlas is Anning (18 km away). In September its highs average 22.4°C, 0.9°C warmer than Haikou, China, with 152 mm of rain.
Among the 884 cities listed in China, Haikou, China ranks joint 759th of 884 for the warmest September highs and joint 744th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Haikou, China is 4.1°C cooler than that mean.
From September to October, average highs fall by 2.3°C to 19.3°C, and monthly rainfall falls from 147 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
Haikou, China climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.3°C6.4°C | 6.4°C | 27 | 4.3 | 10.811 h |
| February | 17.2°C8.2°C | 8.2°C | 22 | 3.8 | 11.311 h |
| March | 20.9°C11.3°C | 11.3°C | 28 | 5.1 | 12.012 h |
| April | 23.6°C13.9°C | 13.9°C | 46 | 7.2 | 12.713 h |
| May | 24.2°C15.8°C | 15.8°C | 107 | 13.2 | 13.313 h |
| June | 23.7°C17.2°C | 17.2°C | 215 | 22.7 | 13.614 h |
| July | 23.1°C17.4°C | 17.4°C | 254 | 26.1 | 13.514 h |
| August | 23.1°C17.2°C | 17.2°C | 235 | 25.4 | 13.013 h |
| September, selected | 21.6°C15.9°C | 15.9°C | 147 | 20.3 | 12.312 h |
| October | 19.3°C13.4°C | 13.4°C | 87 | 13.7 | 11.612 h |
| November | 16.7°C9.8°C | 9.8°C | 28 | 4.7 | 11.011 h |
| December | 13.9°C6.7°C | 6.7°C | 16 | 3.4 | 10.611 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
- Anning in SeptemberChina · 18 kmHigh 22.4°C · Low 16.0°C · 152 mm rain
- Majie in SeptemberChina · 29 kmHigh 22.0°C · Low 15.5°C · 165 mm rain
- Kunming in SeptemberChina · 32 kmHigh 22.0°C · Low 15.3°C · 165 mm rain
- Longquan in SeptemberChina · 44 kmHigh 24.3°C · Low 17.0°C · 129 mm rain
- Yuxi in SeptemberChina · 47 kmHigh 23.5°C · Low 16.6°C · 125 mm rain
- Miyang in SeptemberChina · 97 kmHigh 24.4°C · Low 17.3°C · 95 mm rain
- Chuxiong in SeptemberChina · 108 kmHigh 23.0°C · Low 15.9°C · 126 mm rain
- Zhongshu in SeptemberChina · 124 kmHigh 22.5°C · Low 15.8°C · 117 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 Haikou) is explained once on the Haikou, China year overview and on the Sources, method and limits page.