Chiang Mai
September
Weather in Chiang Mai for September 2025
Your guide to Chiang Mai weather in September - trends and predictions
In general, the average temperature in Chiang Mai at the beginning of September is 30.7 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 29 °C by the end of September.
Chiang Mai experiences an exceptionally high level of rainfall in September, with more than 24 rainy days on average.
Is September a good time to visit Chiang Mai? check out the best time to travel to Chiang Mai page.
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3
Dry days
27
Rainy days
0
Snow days
29°/22°
Temperatures
6 km/h
Avg max wind
90 %
Avg humidity
Chiang Mai in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  31° | 2 29° | 3 32° | 4  33° | 5  31° | 6 28° | 7 31° |
| 8 30° | 9 26° | 10 27° | 11 27° | 12  29° | 13 31° | 14 28° |
| 15  29° | 16 29° | 17 26° | 18 27° | 19 28° | 20  29° | 21 30° |
| 22 31° | 23 28° | 24 28° | 25 30° | 26 31° | 27 29° | 28 29° |
| 29 28° | 30 28° |
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Temperatures trend during September in Chiang Mai
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. | Light rain shower | 31° /22° | 17 mm | 7 | |
| 2 Sept. | Light rain shower | 29° /22° | 17.7 mm | 7 | |
| 3 Sept. | Light rain shower | 32° /22° | 5.6 mm | 7 | |
| 4 Sept. | Patchy light rain with thunder | 33° /21° | 7 mm | 7 | |
| 5 Sept. | Moderate or heavy rain shower | 31° /22° | 30 mm | 7 | |
| 6 Sept. | Moderate or heavy rain shower | 28° /22° | 17.2 mm | 6 | |
| 7 Sept. | Light rain shower | 31° /22° | 8.5 mm | 7 | |
| 8 Sept. | Light rain shower | 30° /22° | 13.7 mm | 7 | |
| 9 Sept. | Moderate or heavy rain shower | 26° /21° | 26 mm | 6 | |
| 10 Sept. | Light rain shower | 27° /21° | 6.6 mm | 6 | |
| 11 Sept. | Moderate or heavy rain shower | 27° /21° | 16.8 mm | 6 | |
| 12 Sept. | Fog | 29° /21° | 1.7 mm | 6 | |
| 13 Sept. | Fog | 31° /21° | 1.6 mm | 7 | |
| 14 Sept. | Fog | 28° /21° | 0.9 mm | 6 | |
| 15 Sept. | Moderate rain | 29° /21° | 2.8 mm | 7 | |
| 16 Sept. | Light rain shower | 29° /21° | 13 mm | 7 | |
| 17 Sept. | Light rain shower | 26° /21° | 11.6 mm | 6 | |
| 18 Sept. | Light rain shower | 27° /21° | 11.7 mm | 6 | |
| 19 Sept. | Light rain shower | 28° /21° | 4.9 mm | 6 | |
| 20 Sept. | Light drizzle | 29° /21° | 5.4 mm | 7 | |
| 21 Sept. | Patchy light rain with thunder | 30° /21° | 9.4 mm | 7 | |
| 22 Sept. | Patchy light rain with thunder | 31° /21° | 10.3 mm | 7 | |
| 23 Sept. | Fog | 28° /21° | 17.5 mm | 6 | |
| 24 Sept. | Fog | 28° /21° | 19.6 mm | 6 | |
| 25 Sept. | Patchy rain possible | 30° /21° | 7.4 mm | 7 | |
| 26 Sept. | Light rain shower | 31° /21° | 6.3 mm | 7 | |
| 27 Sept. | Light rain shower | 29° /21° | 14 mm | 7 | |
| 28 Sept. | Light rain shower | 29° /21° | 17.2 mm | 7 | |
| 29 Sept. | Light rain shower | 28° /21° | 6.2 mm | 6 | |
| 30 Sept. | Light rain shower | 28° /21° | 13.3 mm | 7 | |
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Important Notice
Our weather forecast for Chiang Mai 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 Chiang Mai forecast closer to your planned date for the most up-to-date weather information.
Chiang Mai in September - FAQ
What are the expected maximum and minimum temperatures in Chiang Mai during September?
During September, expect a variety of temperatures with highs around 29° and lows near 22°, suitable for diverse activities and preferences.
How much rainfall should be expected in Chiang Mai during September?
Significant rainfall exceeding 407.5 mm is expected in Chiang Mai during September, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Chiang Mai during September?
The average wind speed in Chiang Mai during September is 6 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Chiang Mai in September?
As you prepare for your trip to Chiang Mai 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 Chiang Mai, 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
September rainfall patterns in Chiang Mai
Explore the daily rainfall trends and prepare for Chiang Mais September weather 💧
UV exposure in Chiang Mai during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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