Weather in Siem Reap for September 2025
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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Siem Reap in September average weather
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
September weather day by day
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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Siem Reap in September - FAQ
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
UV exposure in Siem Reap during September
Quick links
Get accurate weather forecasts for Siem Reap, located at latitude 13.362 and longitude 103.861. Stay updated with localized weather information tailored for Siem Reap.