Chiang Rai
September
Weather in Chiang Rai for September 2025
Your guide to Chiang Rai weather in September - trends and predictions
In general, the average temperature in Chiang Rai at the beginning of September is 30.7 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 28.4 °C by the end of September.
Chiang Rai 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 Rai? check out the best time to travel to Chiang Rai page.
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5
Dry days
25
Rainy days
0
Snow days
29°/22°
Temperatures
5 km/h
Avg max wind
90 %
Avg humidity
Chiang Rai in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  30° | 2  27° | 3  32° | 4 32° | 5  32° | 6 30° | 7 32° |
| 8 28° | 9 27° | 10 26° | 11 26° | 12  28° | 13 28° | 14 29° |
| 15 30° | 16 31° | 17 29° | 18 28° | 19 28° | 20 28° | 21 30° |
| 22 28° | 23 28° | 24 28° | 25 29° | 26 31° | 27 28° | 28 28° |
| 29 28° | 30 27° |
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Temperatures trend during September in Chiang Rai
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. | Patchy light rain with thunder | 30° /22° | 29 mm | 7 | |
| 2 Sept. | Torrential rain shower | 27° /22° | 39 mm | 6 | |
| 3 Sept. | Light rain shower | 32° /22° | 4.1 mm | 7 | |
| 4 Sept. | Light rain shower | 32° /22° | 6 mm | 7 | |
| 5 Sept. | Moderate or heavy rain shower | 32° /22° | 23.6 mm | 7 | |
| 6 Sept. | Light rain shower | 30° /22° | 10.7 mm | 7 | |
| 7 Sept. | Patchy light rain with thunder | 32° /22° | 27.9 mm | 7 | |
| 8 Sept. | Patchy light rain with thunder | 28° /22° | 25.1 mm | 6 | |
| 9 Sept. | Moderate or heavy rain shower | 27° /22° | 26.1 mm | 6 | |
| 10 Sept. | Moderate or heavy rain shower | 26° /21° | 24.5 mm | 6 | |
| 11 Sept. | Moderate or heavy rain shower | 26° /21° | 12.8 mm | 6 | |
| 12 Sept. | Fog | 28° /21° | 4.4 mm | 6 | |
| 13 Sept. | Fog | 28° /21° | 2.3 mm | 7 | |
| 14 Sept. | Fog | 29° /22° | 2 mm | 7 | |
| 15 Sept. | Moderate or heavy rain shower | 30° /21° | 3 mm | 7 | |
| 16 Sept. | Light rain shower | 31° /21° | 10.9 mm | 7 | |
| 17 Sept. | Light rain shower | 29° /21° | 9.4 mm | 7 | |
| 18 Sept. | Light rain shower | 28° /22° | 14.7 mm | 7 | |
| 19 Sept. | Light rain shower | 28° /21° | 5.7 mm | 6 | |
| 20 Sept. | Light rain shower | 28° /21° | 6.8 mm | 6 | |
| 21 Sept. | Patchy light rain with thunder | 30° /21° | 5.9 mm | 7 | |
| 22 Sept. | Patchy light rain with thunder | 28° /21° | 15.5 mm | 6 | |
| 23 Sept. | Mist | 28° /21° | 3.4 mm | 6 | |
| 24 Sept. | Patchy rain possible | 28° /21° | 1.9 mm | 6 | |
| 25 Sept. | Patchy light rain with thunder | 29° /21° | 9 mm | 7 | |
| 26 Sept. | Fog | 31° /20° | 6.5 mm | 7 | |
| 27 Sept. | Light rain shower | 28° /21° | 5 mm | 6 | |
| 28 Sept. | Light rain shower | 28° /21° | 8.7 mm | 7 | |
| 29 Sept. | Light rain shower | 28° /21° | 9.1 mm | 7 | |
| 30 Sept. | Light rain shower | 27° /21° | 14.1 mm | 6 | |
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Important Notice
Our weather forecast for Chiang Rai 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 Rai forecast closer to your planned date for the most up-to-date weather information.
Chiang Rai in September - FAQ
What are the expected maximum and minimum temperatures in Chiang Rai 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 Rai during September?
Significant rainfall exceeding 444.5 mm is expected in Chiang Rai during September, occurring over more than 25 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Chiang Rai during September?
The average wind speed in Chiang Rai during September is 5 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Chiang Rai in September?
As you prepare for your trip to Chiang Rai 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 Rai, 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 Rai
Explore the daily rainfall trends and prepare for Chiang Rais September weather 💧
UV exposure in Chiang Rai during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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