Climate averages 1991–2020
Kampong Chhnang weather
in September.
A hot, very wet month: the 9th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Kampong Chhnang: daytime highs average 30.8°C and nights cool to about 24.5°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 234 mm of rain on roughly 27 days, which makes September a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 12 min on an average September day.
The nearest other city in this atlas is Phnom Penh (81 km away). In September its highs average 31.0°C, about as warm as Kampong Chhnang, with 245 mm of rain.
Among the 8 cities listed in Cambodia, Kampong Chhnang ranks 4th of 8 for the warmest September highs and 3rd of 8 for the driest September (rainfall, lowest first). The mean September high of those 8 cities is 30.4°C; Kampong Chhnang is 0.4°C warmer than that mean.
From September to October, average highs fall by 0.5°C to 30.3°C, and monthly rainfall falls from 234 mm to 209 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
Kampong Chhnang climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.9°C22.5°C | 22.5°C | 10 | 1.9 | 11.511 h |
| February | 33.5°C23.9°C | 23.9°C | 8.5 | 1.8 | 11.712 h |
| March | 34.8°C25.6°C | 25.6°C | 43 | 6.3 | 12.112 h |
| April | 34.9°C26.1°C | 26.1°C | 86 | 14.1 | 12.412 h |
| May | 33.6°C25.9°C | 25.9°C | 151 | 22.5 | 12.713 h |
| June | 32.2°C25.3°C | 25.3°C | 158 | 23.5 | 12.813 h |
| July | 31.7°C24.9°C | 24.9°C | 166 | 25.6 | 12.813 h |
| August | 31.5°C24.7°C | 24.7°C | 186 | 26.7 | 12.513 h |
| September, selected | 30.8°C24.5°C | 24.5°C | 234 | 26.6 | 12.212 h |
| October | 30.3°C24.0°C | 24.0°C | 209 | 22.8 | 11.912 h |
| November | 30.4°C23.3°C | 23.3°C | 71 | 9.8 | 11.612 h |
| December | 30.5°C22.4°C | 22.4°C | 22 | 3.4 | 11.411 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
- Phnom Penh in SeptemberCambodia · 81 kmHigh 31.0°C · Low 24.5°C · 245 mm rain
- Dangkao in SeptemberCambodia · 86 kmHigh 31.0°C · Low 24.5°C · 245 mm rain
- Takeo in SeptemberCambodia · 141 kmHigh 30.6°C · Low 24.2°C · 221 mm rain
- Siem Reap in SeptemberCambodia · 151 kmHigh 30.3°C · Low 24.5°C · 244 mm rain
- Tân Châu in SeptemberVietnam · 173 kmHigh 30.7°C · Low 24.5°C · 254 mm rain
- Hồng Ngự in SeptemberVietnam · 178 kmHigh 30.8°C · Low 24.5°C · 254 mm rain
- Châu Đốc in SeptemberVietnam · 179 kmHigh 30.4°C · Low 24.4°C · 271 mm rain
- Battambang in SeptemberCambodia · 185 kmHigh 31.2°C · Low 24.5°C · 192 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 Kampong Chhnang) is explained once on the Kampong Chhnang year overview and on the Sources, method and limits page.