Climate averages 1991–2020
Sihanoukville weather
in December.
A hot, moderately wet month: the joint 5th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Sihanoukville: daytime highs average 29.4°C and nights cool to about 24.5°C. By daytime temperature it is the joint 5th warmest of the 12 months.
Expect about 44 mm of rain on roughly 9 days, which makes December a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 31 min on an average December day.
The nearest other city in this atlas is Phú Quốc (64 km away). In December its highs average 27.3°C, 2.2°C cooler than Sihanoukville, with 45 mm of rain.
Among the 8 cities listed in Cambodia, Sihanoukville ranks 8th of 8 for the warmest December highs and 8th of 8 for the driest December (rainfall, lowest first). The mean December high of those 8 cities is 30.3°C; Sihanoukville is 0.8°C cooler than that mean.
From December to January, average highs fall by 0.1°C to 29.4°C, and monthly rainfall falls from 44 mm to 37 mm.
The annual picture
December 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 | 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, selected | 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
December in nearby cities
- Phú Quốc in DecemberVietnam · 64 kmHigh 27.3°C · Low 24.3°C · 45 mm rain
- Hà Tiên in DecemberVietnam · 108 kmHigh 29.8°C · Low 23.1°C · 47 mm rain
- Takeo in DecemberCambodia · 144 kmHigh 30.4°C · Low 22.7°C · 36 mm rain
- Tịnh Biên in DecemberVietnam · 154 kmHigh 30.2°C · Low 22.6°C · 54 mm rain
- Châu Đốc in DecemberVietnam · 174 kmHigh 30.2°C · Low 22.6°C · 47 mm rain
- Dangkao in DecemberCambodia · 179 kmHigh 30.5°C · Low 22.8°C · 27 mm rain
- Rạch Giá in DecemberVietnam · 182 kmHigh 29.3°C · Low 23.0°C · 57 mm rain
- Phnom Penh in DecemberCambodia · 185 kmHigh 30.5°C · Low 22.7°C · 27 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.