Climate averages 1991–2020
Sihanoukville weather
in September.
A hot, very wet month: the coolest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Sihanoukville: daytime highs average 28.0°C and nights cool to about 25.0°C. By daytime temperature it is the coolest month of the year.
Expect about 554 mm of rain on roughly 28 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 11 min on an average September day.
The nearest other city in this atlas is Phú Quốc (64 km away). In September its highs average 26.7°C, 1.3°C cooler than Sihanoukville, with 393 mm of rain.
Among the 8 cities listed in Cambodia, Sihanoukville ranks 8th of 8 for the warmest September highs and 8th of 8 for the driest September (rainfall, lowest first). The mean September high of those 8 cities is 30.4°C; Sihanoukville is 2.4°C cooler than that mean.
From September to October, average highs rise by 0.5°C to 28.5°C, and monthly rainfall falls from 554 mm to 343 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
Sihanoukville climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.4°C24.1°C | 24.1°C | 37 | 9.7 | 11.612 h |
| February | 29.9°C24.5°C | 24.5°C | 30 | 8.3 | 11.812 h |
| March | 30.6°C25.5°C | 25.5°C | 65 | 13.4 | 12.112 h |
| April | 30.9°C26.2°C | 26.2°C | 115 | 19.0 | 12.412 h |
| May | 29.8°C26.1°C | 26.1°C | 377 | 27.9 | 12.613 h |
| June | 28.8°C25.7°C | 25.7°C | 489 | 27.7 | 12.713 h |
| July | 28.3°C25.3°C | 25.3°C | 558 | 29.4 | 12.713 h |
| August | 28.1°C25.3°C | 25.3°C | 556 | 28.9 | 12.512 h |
| September, selected | 28.0°C25.0°C | 25.0°C | 554 | 28.4 | 12.212 h |
| October | 28.5°C24.7°C | 24.7°C | 343 | 27.1 | 11.912 h |
| November | 29.3°C24.9°C | 24.9°C | 104 | 15.4 | 11.612 h |
| December | 29.4°C24.5°C | 24.5°C | 44 | 9.3 | 11.512 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
- Phú Quốc in SeptemberVietnam · 64 kmHigh 26.7°C · Low 24.7°C · 393 mm rain
- Hà Tiên in SeptemberVietnam · 108 kmHigh 29.0°C · Low 25.1°C · 239 mm rain
- Takeo in SeptemberCambodia · 144 kmHigh 30.6°C · Low 24.2°C · 221 mm rain
- Tịnh Biên in SeptemberVietnam · 154 kmHigh 30.3°C · Low 24.6°C · 294 mm rain
- Châu Đốc in SeptemberVietnam · 174 kmHigh 30.4°C · Low 24.4°C · 271 mm rain
- Dangkao in SeptemberCambodia · 179 kmHigh 31.0°C · Low 24.5°C · 245 mm rain
- Rạch Giá in SeptemberVietnam · 182 kmHigh 29.0°C · Low 24.9°C · 352 mm rain
- Phnom Penh in SeptemberCambodia · 185 kmHigh 31.0°C · Low 24.5°C · 245 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 Sihanoukville) is explained once on the Sihanoukville year overview and on the Sources, method and limits page.