Phnom Penh · AutumnMonth summary
Phnom Penh weather in September
⚠️ Fair
🌡️ Temperature min / max
77°F – 88°F
🌧 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: September is an average time for Phnom Penh. January (8.1/10) is clearly preferable.
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
Autumn marks the end of peak season in Phnom Penh. Temperatures drop (31°F) and rain returns (93% of days). With 93% of rainy days, always have indoor alternatives planned.
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Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ☀️ January | 73°F | 90°F | 12% | 0.0in | 11.0h | 8.1/10 |
| ☀️ February | 75°F | 91°F | 11% | 0.0in | 11.1h | 7.8/10 |
| ☀️ March | 77°F | 93°F | 19% | 0.1in | 11.6h | 7.4/10 |
| 🌤️ April | 79°F | 95°F | 47% | 0.1in | 12.0h | 7.0/10 |
| ⛅ May | 79°F | 91°F | 82% | 0.2in | 10.5h | 5.5/10 |
| ⛅ June | 79°F | 90°F | 79% | 0.2in | 10.0h | 6.6/10 |
| 🌧️ July | 77°F | 90°F | 80% | 0.2in | 8.7h | 6.0/10 |
| 🌧️ August | 77°F | 90°F | 84% | 0.3in | 9.5h | 6.0/10 |
| 🌧️ September | 77°F | 88°F | 93% | 0.4in | 8.5h | 5.4/10 |
| 🌧️ October | 75°F | 88°F | 82% | 0.4in | 9.2h | 6.6/10 |
| 🌤️ November | 75°F | 86°F | 53% | 0.2in | 10.9h | 7.4/10 |
| ☀️ December | 75°F | 88°F | 22% | 0.1in | 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 88°F, 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°F
- 🌧 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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Activities & tours
Activities and tours in Phnom Penh
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