Climate averages 1991–2020
Sihanoukville weather
by month.
See how the year changes. April has the highest average daily maximum; February has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Sihanoukville averages a daytime high of 29.3°C and a nighttime low of 25.2°C, with about 3,272 mm of rain on roughly 245 days. April is the warmest month (average high 30.9°C) and September the coolest (28.0°C). July is the wettest month with 558 mm; February is the driest with 30 mm.
The annual picture
A year in Sihanoukville
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 | 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
Nearby cities
- Phú QuốcVietnam · 64 kmHigh 27.4°C · Low 24.9°C · 2,596 mm rain a year
- Hà TiênVietnam · 108 kmHigh 30.3°C · Low 24.7°C · 1,692 mm rain a year
- TakeoCambodia · 144 kmHigh 31.7°C · Low 24.1°C · 1,385 mm rain a year
- Tịnh BiênVietnam · 154 kmHigh 31.3°C · Low 24.1°C · 1,939 mm rain a year
- Châu ĐốcVietnam · 174 kmHigh 31.3°C · Low 24.1°C · 1,727 mm rain a year
- DangkaoCambodia · 179 kmHigh 32.2°C · Low 24.4°C · 1,374 mm rain a year
- Rạch GiáVietnam · 182 kmHigh 30.2°C · Low 24.5°C · 2,218 mm rain a year
- Phnom PenhCambodia · 185 kmHigh 32.2°C · Low 24.4°C · 1,374 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+7, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 10.60°, 103.60° (8 km from the city centre), adjusted up by 0.3°C for the difference between the city's elevation (6 m) and the cell's (55 m). Rain comes from the 0.25° cell at 10.50°, 103.50°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.