Weather in Chiang Rai for September 2026
Until now, September 2026 in Chiang Rai is slightly cooler than the historical average by 1.8 °C.
Expect cooler weather in the next days in Chiang Rai with the forecast suggesting a temperature of 27.3 °C, lower than the historical average.
In general, the average temperature in Chiang Rai at the beginning of September is 30 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 27.4 °C by the end of September.
Chiang Rai experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 340.7 mm.
Is September a good time to visit Chiang Rai? check out the best time to travel to Chiang Rai page.
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Chiang Rai Weather September
Temperatures trend during September in Chiang Rai
September weather in Chiang Rai day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy light rain with thunder | 29° /21° | 20.9 mm | 5 | |
| 2 Sept. |  Light rain shower | 28° /21° | 23.9 mm | 5 | |
| 3 Sept. | Light rain shower | 30° /21° | 16 mm | 6 | |
| 4 Sept. | Light rain shower | 31° /21° | 10.9 mm | 6 | |
| 5 Sept. | Patchy light rain with thunder | 31° /21° | 14.5 mm | 7 | |
| 6 Sept. | Patchy light rain with thunder | 30° /22° | 9.6 mm | 7 | |
| 7 Sept. | Patchy light rain with thunder | 31° /21° | 18.5 mm | 7 | |
| 8 Sept. | Patchy light rain with thunder | 29° /21° | 19.9 mm | 6 | |
| 9 Sept. |  Moderate or heavy rain shower | 28° /22° | 15.7 mm | 5 | |
| 10 Sept. | Moderate or heavy rain shower | 27° /21° | 23.9 mm | 5 | |
| 11 Sept. | Light rain shower | 27° /21° | 14.7 mm | 6 | |
| 12 Sept. |  Fog | 28° /21° | 5 mm | 7 | |
| 13 Sept. | Fog | 28° /21° | 3.1 mm | 7 | |
| 14 Sept. | Patchy light rain with thunder | 30° /22° | 7 mm | 6 | |
| 15 Sept. | Moderate or heavy rain shower | 29° /21° | 7.1 mm | 6 | |
| 16 Sept. | Light rain shower | 26° /21° | 14.8 mm | 11.3 | |
| 17 Sept. | Light rain shower | 28° /20° | 19.4 mm | 10.9 | |
| 18 Sept. | Light rain shower | 26° /20° | 17.9 mm | 11.7 | |
| 19 Sept. | Light rain shower | 27° /21° | 9.9 mm | 11.7 | |
| 20 Sept. | Light rain shower | 27° /21° | 5.1 mm | 11.5 | |
| 21 Sept. | Patchy rain possible | 28° /22° | 1.4 mm | 7 | |
| 22 Sept. | Light rain shower | 28° /21° | 3 mm | 7 | |
| 23 Sept. | Light rain shower | 26° /21° | 3.4 mm | 6 | |
| 24 Sept. | Patchy rain possible | 26° /20° | 1 mm | 6 | |
| 25 Sept. |  Overcast | 28° /20° | 0 mm | 7 | |
| 26 Sept. |  Sunny | 29° /22° | 0 mm | 7 | |
| 27 Sept. | Sunny | 30° /23° | 0 mm | 7 | |
| 28 Sept. | Patchy rain possible | 28° /21° | 20.7 mm | 7 | |
| 29 Sept. | Patchy rain possible | 25° /21° | 28.2 mm | 7 | |
| 30 Sept. | Light rain shower | 26° /21° | 13.1 mm | 6 | |
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Chiang Rai weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 28°/22° | 29°/22° | 29°/20° |
| Rainfall | 374 mm | 341 mm | 230 mm |
| Wind | 5 km/h | 5 km/h | 4.7 km/h |
| Humidity | 90% | 89% | 86% |
| Rainy days | 31 days | 30 days | 30 days |
| Dry days | 0 days | 0 days | 1 days |
Planning a trip to Chiang Rai? Discover the best time to visit
Chiang Rai in September - FAQ
What are the expected maximum and minimum temperatures in Chiang Rai during September?
How much rainfall should be expected in Chiang Rai during September?
What are the typical wind conditions in Chiang Rai during September?
September rainfall patterns in Chiang Rai
UV exposure in Chiang Rai during September
What to pack to Chiang Rai in September?
Warm & sunny · highs around 29 °C, frequent showers
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
👟 Footwear
🎒 Accessories
🧴 Personal Items
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Where is Chiang Rai?Get accurate weather forecasts for Chiang Rai, located at latitude 19.909 and longitude 99.833. Stay updated with localized weather information tailored for Chiang Rai.