Siem Reap · AutumnMonth summary
Siem Reap weather in September
⚠️ Fair
🌡️ Temperature min / max
75°F – 88°F
🌧 Rainy days
91% of days
☀️ Sunshine
8.6h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
5.5/10
📅 📅 Best month
January (8.3/10)
Quick decision
Should you visit Siem Reap 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 Siem Reap. January (8.3/10) is clearly preferable.
By trip type
Siem Reap 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 Siem Reap. Temperatures drop (31°F) and rain returns (91% of days). With 91% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. January (8.3/10) is significantly better if possible.
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All months for Siem Reap
Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ☀️ January | 72°F | 88°F | 7% | 0.0in | 10.5h | 8.3/10 |
| ☀️ February | 73°F | 90°F | 15% | 0.0in | 10.8h | 8.0/10 |
| 🌤️ March | 77°F | 93°F | 35% | 0.1in | 11.0h | 7.1/10 |
| 🌤️ April | 79°F | 93°F | 47% | 0.1in | 11.5h | 7.0/10 |
| ⛅ May | 79°F | 91°F | 77% | 0.3in | 11.0h | 6.1/10 |
| ⛅ June | 79°F | 90°F | 76% | 0.2in | 10.4h | 7.0/10 |
| 🌧️ July | 79°F | 90°F | 85% | 0.3in | 9.2h | 5.8/10 |
| 🌧️ August | 77°F | 90°F | 81% | 0.3in | 9.5h | 6.2/10 |
| 🌧️ September | 75°F | 88°F | 91% | 0.4in | 8.6h | 5.5/10 |
| ⛅ October | 75°F | 88°F | 75% | 0.3in | 9.7h | 7.0/10 |
| 🌤️ November | 73°F | 88°F | 45% | 0.1in | 10.3h | 7.4/10 |
| ☀️ December | 72°F | 86°F | 15% | 0.0in | 10.1h | 8.3/10 |
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, Siem Reap averages 88°F, 91% rainy days and 8.6h of sunshine per day. Overall weather score: 5.5/10.
See methodology →
Comparison
September vs January (best month)
The best month is January (score 8.3/10). Difference:
- 🌡️ Max temperature : +0°F
- 🌧 Rainy days : -84%
- ☀️ Sunshine : +1.9h/day
FAQ
FAQ — Siem Reap in September
Is September a good time to visit Siem Reap?
September is an acceptable time for Siem Reap (score 5.5/10). Conditions are decent but not optimal — consider January (8.3/10) if possible.
Does it rain a lot in Siem Reap in September?
Yes, 91% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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