Climate in Phnom Penh — Annual Weather Overview
Phnom Penh has a tropical climate — hot and humid year-round with a distinct wet season. The hottest month is March (average high 34.2°C) and the coolest is October (30.2°C). Temperatures are consistent year-round, with highs ranging only 4.0°C between the warmest and coolest months. Annual rainfall totals around 2026mm. October is the wettest month at 382.8mm, while January averages just 22.2mm. Average daily sunshine is 9.6 hours.
**Spring (March, April, May):** average highs 33.7°C, 351mm rain. **Summer (June, July, August):** average highs 32.3°C, 647mm rain. **Autumn (September, October, November):** average highs 30.4°C, 946mm rain. **Winter (December, January, February):** average highs 31.2°C, 82mm rain.
Phnom Penh — Monthly Temperatures
Phnom Penh — Monthly Rainfall
✅ Best months to visit
All year
ℹ️ No months to avoid
Weather in Phnom Penh stays reasonable all year.
Phnom Penh weather by month
| Month | High | Low | Rain | Sun/day | Rainy days | Rating |
|---|---|---|---|---|---|---|
| January | 30.9°C | 22.6°C | 22.2mm | 10.3h | 4 | 10/10 |
| February | 32.4°C | 23.4°C | 26.1mm | 10.9h | 3 | 10/10 |
| March | 34.2°C | 24.9°C | 39.5mm | 11.4h | 5 | 10/10 |
| April | 33.6°C | 25.5°C | 121.7mm | 10.7h | 18 | 9/10 |
| May | 33.3°C | 26.2°C | 190.1mm | 10.0h | 24 | 9/10 |
| June | 32.9°C | 25.8°C | 167.4mm | 9.5h | 23 | 9/10 |
| July | 31.8°C | 25.3°C | 228.8mm | 8.4h | 26 | 8/10 |
| August | 32.3°C | 25.3°C | 250.5mm | 8.7h | 24 | 8/10 |
| September | 30.8°C | 24.9°C | 338.9mm | 7.6h | 29 | 8/10 |
| October | 30.2°C | 24.3°C | 382.8mm | 8.0h | 25 | 8/10 |
| November | 30.3°C | 24.0°C | 224.5mm | 9.7h | 18 | 8/10 |
| December | 30.2°C | 23.0°C | 33.6mm | 10.2h | 6 | 10/10 |
For the full verdict on when to go, see the best time to visit Phnom Penh and the Phnom Penh rainy season guide. Seasonal breakdowns: spring, summer, autumn and winter.
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Frequently Asked Questions
What type of climate does Phnom Penh have?
Phnom Penh has a tropical climate — hot and humid year-round with a distinct wet season. Average highs range from 30.2°C in October to 34.2°C in March.
What is the hottest month in Phnom Penh?
March is the hottest month in Phnom Penh, with average highs of 34.2°C and lows of 24.9°C.
What is the coldest month in Phnom Penh?
October is the coolest month, with average highs of 30.2°C and lows of 22.6°C.
What is the wettest month in Phnom Penh?
October is the wettest month, averaging 382.8mm of rainfall over around 25 rainy days.
When is rainy season in Phnom Penh?
Rainy season in Phnom Penh runs April to November, when rainfall is significantly higher than the rest of the year. Full rainy season guide →
How much rain does Phnom Penh get per year?
Phnom Penh receives around 2026mm of rain per year. The driest month is January (22.2mm).
When is the best time to visit Phnom Penh?
The best time to visit Phnom Penh 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: Phnom Penh packing list at 247PackingList. For currency, language and country facts see the Cambodia guide at 247CountryInfo. Some travellers fund a longer stay in Phnom Penh by teaching English along the way — a TEFL certificate is usually all it takes.
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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.