Monthly climate guide
Siem Reap weather in December
December in Siem Reap is typically very hot, with average daytime highs around 32°C (90°F) and night-time lows near 21°C (69°F). The month usually brings about 7 mm of rain (very dry) and is often cloudy. Daytime highs are about the same as November and 2°C cooler than January.
What stands out in December
- Expect a big gap between day and night — about 12°C.
- December sits in Siem Reap's drier season — usually a comfortable time to visit.
- It's one of the drier months, with about 93% less rain than Siem Reap's average.
- Siem Reap is usually about 3°C warmer than Kampot, 310 km away, in December.
It's usually the driest month of the year.
Avg high
32°C
90°F
Avg low
21°C
69°F
Rainfall
7 mm
very dry
Humidity
66%
relative
Sky
55%
cloud · often cloudy
Siem Reap weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 34°C / 93°F | 21°C / 70°F | 12 mm | 57% | 47% |
| February | 36°C / 97°F | 23°C / 73°F | 9 mm | 51% | 35% |
| March | 37°C / 99°F | 26°C / 78°F | 38 mm | 55% | 61% |
| April | 36°C / 97°F | 26°C / 79°F | 62 mm | 63% | 75% |
| May | 35°C / 94°F | 26°C / 79°F | 114 mm | 72% | 84% |
| June | 32°C / 90°F | 25°C / 77°F | 173 mm | 81% | 87% |
| July | 31°C / 87°F | 24°C / 76°F | 187 mm | 85% | 89% |
| August | 31°C / 88°F | 24°C / 76°F | 185 mm | 85% | 91% |
| September | 31°C / 87°F | 24°C / 76°F | 232 mm | 86% | 91% |
| October | 31°C / 88°F | 24°C / 75°F | 148 mm | 83% | 76% |
| November | 32°C / 90°F | 23°C / 73°F | 42 mm | 78% | 66% |
| December | 32°C / 90°F | 21°C / 69°F | 7 mm | 66% | 55% |
What to pack for December
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
Is December a good time to visit Siem Reap?
Compare the months in the chart above to find your ideal window.
Best time to visit Siem Reap →Other Cambodia cities in December
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Siem Reap weather in December. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/cambodia/siem-reap/december
<a href="https://weathercompare.eu/weather/cambodia/siem-reap/december">Siem Reap weather in December</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/cambodia/siem-reap" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Siem Reap weather in December"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/cambodia/siem-reap/december">Siem Reap weather in December</a> – WeatherCompare</p>
Siem Reap in December: quick answers
Is December a good time to visit Siem Reap?
Yes. December is one of the best months for Siem Reap, with highs around 32°C and about 7 mm of rain.
How warm is Siem Reap in December?
Average highs are about 32°C (90°F) and average lows about 21°C (69°F), based on 10 years of daily data.
Does it rain a lot in Siem Reap in December?
Siem Reap typically gets around 7 mm of rain in December — very dry. It's usually the driest month of the year.
Figures are long-term averages for the area around Siem Reap (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.