Phnom Penh · AutumnMonth summary
Phnom Penh weather in September
⚠️ Fair
🌡️ Temperature min / max
25°C – 31°C
🌧 Rainy days
93% of days
☀️ Sunshine
8.5h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
5.4/10
📅 📅 Best month
January (8.1/10)
Quick decision
Should you visit Phnom Penh in September?
⚠️ Fair
✅ Yes if: you prefer off-season travel with reduced prices and very few tourists.
❌ No if: you want to avoid rain — more than half the days are rainy.
Our take: Phnom Penh in September is possible but January offers a score of 8.1/10 vs 5.4.
By trip type
Phnom Penh in September by trip type
- 🏙️ 🏙️ City break / culture : ⚠️ Possible
- 🚶 🚶 Outdoor activities : ❌ Not recommended
- 🏖️ Beach / swimming : ❌ Not recommended
- 💰 💰 Budget : ✅ Low season
Local context
What to expect in September
🎯 Harvest season — fresh local produce at markets and restaurants Autumn marks the end of peak season in Phnom Penh. Temperatures drop (31°C) and rain returns (93% of days). With 93% of rainy days, always have indoor alternatives planned.
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All months for Phnom Penh
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ☀️ January | 23°C | 32°C | 12% | 0.6 | 11.0h | 8.1/10 |
| ☀️ February | 24°C | 33°C | 11% | 0.6 | 11.1h | 7.8/10 |
| ☀️ March | 25°C | 34°C | 19% | 1.4 | 11.6h | 7.4/10 |
| 🌤️ April | 26°C | 35°C | 47% | 3.4 | 12.0h | 7.0/10 |
| ⛅ May | 26°C | 33°C | 82% | 6.3 | 10.5h | 5.5/10 |
| ⛅ June | 26°C | 32°C | 79% | 5.9 | 10.0h | 6.6/10 |
| 🌧️ July | 25°C | 32°C | 80% | 6.3 | 8.7h | 6.0/10 |
| 🌧️ August | 25°C | 32°C | 84% | 7.1 | 9.5h | 6.0/10 |
| 🌧️ September | 25°C | 31°C | 93% | 10.4 | 8.5h | 5.4/10 |
| 🌧️ October | 24°C | 31°C | 82% | 10.2 | 9.2h | 6.6/10 |
| 🌤️ November | 24°C | 30°C | 53% | 5.2 | 10.9h | 7.4/10 |
| ☀️ December | 24°C | 31°C | 22% | 1.3 | 10.7h | 8.0/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Phnom Penh averages 31°C, 93% rainy days and 8.5h of sunshine per day. Overall weather score: 5.4/10.
See methodology →
Comparison
September vs January (best month)
The best month is January (score 8.1/10). Difference:
- 🌡️ Max temperature : +1°C
- 🌧 Rainy days : -81%
- ☀️ Sunshine : +2.5h/day
FAQ
FAQ — Phnom Penh in September
Is September a good time to visit Phnom Penh?
September is not recommended for Phnom Penh (score 5.4/10). With 93% rainy days and 8.5h of sunshine, consider January (8.1/10) instead.
Does it rain a lot in Phnom Penh in September?
Yes, 93% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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