Climate in Siem Reap — Annual Weather Overview
Siem Reap has a tropical climate — hot and humid year-round with a distinct wet season. The hottest month is March (average high 34.6°C) and the coolest is December (29.8°C). Temperatures are consistent year-round, with highs ranging only 4.8°C between the warmest and coolest months. Annual rainfall totals around 2033mm. September is the wettest month at 396.0mm, while December averages just 28.9mm. Average daily sunshine is 9.4 hours.
**Spring (March, April, May):** average highs 33.8°C, 431mm rain. **Summer (June, July, August):** average highs 32.1°C, 669mm rain. **Autumn (September, October, November):** average highs 30.2°C, 838mm rain. **Winter (December, January, February):** average highs 31.2°C, 96mm rain.
Siem Reap — Monthly Temperatures
Siem Reap — Monthly Rainfall
✅ Best months to visit
All year
ℹ️ No months to avoid
Weather in Siem Reap stays reasonable all year.
Siem Reap weather by month
| Month | High | Low | Rain | Sun/day | Rainy days | Rating |
|---|---|---|---|---|---|---|
| January | 31.0°C | 21.0°C | 31.1mm | 10.3h | 2 | 10/10 |
| February | 32.7°C | 22.2°C | 36.1mm | 10.6h | 4 | 10/10 |
| March | 34.6°C | 24.7°C | 47.5mm | 11.1h | 8 | 10/10 |
| April | 33.6°C | 25.1°C | 156.1mm | 10.2h | 18 | 9/10 |
| May | 33.1°C | 25.7°C | 227.2mm | 9.9h | 22 | 8/10 |
| June | 32.9°C | 25.5°C | 162.3mm | 9.6h | 22 | 9/10 |
| July | 31.7°C | 25.2°C | 268.7mm | 8.7h | 26 | 8/10 |
| August | 31.7°C | 25.1°C | 237.6mm | 8.1h | 26 | 8/10 |
| September | 30.3°C | 24.3°C | 396.0mm | 6.8h | 29 | 8/10 |
| October | 30.0°C | 23.4°C | 309.8mm | 7.6h | 24 | 8/10 |
| November | 30.2°C | 22.8°C | 132.1mm | 9.4h | 14 | 9/10 |
| December | 29.8°C | 21.1°C | 28.9mm | 10.1h | 4 | 10/10 |
For the full verdict on when to go, see the best time to visit Siem Reap and the Siem Reap rainy season guide. Seasonal breakdowns: spring, summer, autumn and winter.
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Frequently Asked Questions
What type of climate does Siem Reap have?
Siem Reap has a tropical climate — hot and humid year-round with a distinct wet season. Average highs range from 29.8°C in December to 34.6°C in March.
What is the hottest month in Siem Reap?
March is the hottest month in Siem Reap, with average highs of 34.6°C and lows of 24.7°C.
What is the coldest month in Siem Reap?
December is the coolest month, with average highs of 29.8°C and lows of 21.0°C.
What is the wettest month in Siem Reap?
September is the wettest month, averaging 396.0mm of rainfall over around 29 rainy days.
When is rainy season in Siem Reap?
Rainy season in Siem Reap runs April to November, when rainfall is significantly higher than the rest of the year. Full rainy season guide →
How much rain does Siem Reap get per year?
Siem Reap receives around 2033mm of rain per year. The driest month is December (28.9mm).
When is the best time to visit Siem Reap?
The best time to visit Siem Reap is All year. See the full month-by-month guide →
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For the packing side of things, our sister site has a ready-made checklist: Siem Reap packing list at 247PackingList. For currency, language and country facts see the Cambodia guide at 247CountryInfo. Some travellers fund a longer stay in Siem Reap by teaching English along the way — a TEFL certificate is usually all it takes.
Trip essentials for Siem Reap
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.