Siem Reap
September
Weather in Siem Reap for September 2025
Your guide to Siem Reap weather in September - trends and predictions
In general, the average temperature in Siem Reap at the beginning of September is 31.3 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 30.6 °C by the end of September.
Siem Reap experiences an exceptionally high level of rainfall in September, with more than 24 rainy days on average.
Is September a good time to visit Siem Reap? check out the best time to travel to Siem Reap page.
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4
Dry days
26
Rainy days
0
Snow days
31°/24°
Temperatures
13 km/h
Avg max wind
81 %
Avg humidity
Siem Reap in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  31° | 2  32° | 3 31° | 4 31° | 5 31° | 6 31° | 7 32° |
| 8 32° | 9 32° | 10 32° | 11 29° | 12  31° | 13 30° | 14 30° |
| 15 30° | 16 31° | 17 31° | 18 29° | 19 31° | 20 32° | 21  30° |
| 22 30° | 23 31° | 24 31° | 25 29° | 26 30° | 27  30° | 28 29° |
| 29 33° | 30 32° |
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Temperatures trend during September in Siem Reap
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Moderate or heavy rain shower | 31° /24° | 17 mm | 7 | |
| 2 Sept. | Light rain shower | 32° /24° | 8.6 mm | 7 | |
| 3 Sept. | Patchy rain possible | 31° /24° | 16.5 mm | 7 | |
| 4 Sept. | Moderate or heavy rain shower | 31° /24° | 14.4 mm | 7 | |
| 5 Sept. | Moderate or heavy rain shower | 31° /24° | 31.3 mm | 7 | |
| 6 Sept. | Moderate or heavy rain shower | 31° /24° | 15.1 mm | 7 | |
| 7 Sept. | Patchy rain possible | 32° /24° | 1.7 mm | 7 | |
| 8 Sept. | Patchy rain possible | 32° /25° | 5.8 mm | 7 | |
| 9 Sept. | Moderate or heavy rain shower | 32° /25° | 24.1 mm | 7 | |
| 10 Sept. | Moderate or heavy rain shower | 32° /24° | 11.3 mm | 7 | |
| 11 Sept. | Light rain shower | 29° /24° | 4.7 mm | 7 | |
| 12 Sept. | Overcast | 31° /24° | 1.3 mm | 7 | |
| 13 Sept. | Overcast | 30° /24° | 7.5 mm | 7 | |
| 14 Sept. | Overcast | 30° /24° | 0.3 mm | 7 | |
| 15 Sept. | Overcast | 30° /23° | 0.2 mm | 7 | |
| 16 Sept. | Light rain shower | 31° /24° | 4.2 mm | 7 | |
| 17 Sept. | Light rain shower | 31° /24° | 6.9 mm | 7 | |
| 18 Sept. | Light rain shower | 29° /24° | 6 mm | 7 | |
| 19 Sept. | Light rain shower | 31° /23° | 5.7 mm | 7 | |
| 20 Sept. | Light rain shower | 32° /24° | 7.3 mm | 7 | |
| 21 Sept. | Patchy light rain with thunder | 30° /24° | 13.7 mm | 7 | |
| 22 Sept. | Patchy rain possible | 30° /24° | 9.9 mm | 7 | |
| 23 Sept. | Light rain shower | 31° /24° | 4.7 mm | 7 | |
| 24 Sept. | Light rain shower | 31° /24° | 9.6 mm | 7 | |
| 25 Sept. | Patchy rain possible | 29° /24° | 4.7 mm | 7 | |
| 26 Sept. | Light rain shower | 30° /23° | 5.6 mm | 7 | |
| 27 Sept. | Patchy light drizzle | 30° /23° | 4.5 mm | 7 | |
| 28 Sept. | Light rain shower | 29° /24° | 8.8 mm | 7 | |
| 29 Sept. | Light rain shower | 33° /24° | 1.7 mm | 7 | |
| 30 Sept. | Light rain shower | 32° /24° | 4.9 mm | 7 | |
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Important Notice
Our weather forecast for Siem Reap in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Siem Reap forecast closer to your planned date for the most up-to-date weather information.
Siem Reap in September - FAQ
What are the expected maximum and minimum temperatures in Siem Reap during September?
During September, expect a variety of temperatures with highs around 31° and lows near 24°, suitable for diverse activities and preferences.
How much rainfall should be expected in Siem Reap during September?
Significant rainfall exceeding 322.9 mm is expected in Siem Reap during September, occurring over more than 26 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Siem Reap during September?
The average wind speed in Siem Reap during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Siem Reap in September?
As you prepare for your trip to Siem Reap in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Siem Reap, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Sandals/Flip-flops: Comfortable for warm climates
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
- Insect Repellent: For destinations with mosquitos or other insects
September rainfall patterns in Siem Reap
Explore the daily rainfall trends and prepare for Siem Reaps September weather 💧
UV exposure in Siem Reap during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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