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Weather in Chiang Mai for September 2025

Your guide to Chiang Mai weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Chiang Mai has been nearly identical to the historical average, with a temperature of 30.3 °C (showing only a slight deviation of 0.4 °C).

  • Expect cooler weather in the next days in Chiang Mai with the forecast suggesting a temperature of 27.9 °C, lower than the historical average.

  • In general, the average temperature in Chiang Mai at the beginning of September is 30.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.1 °C by the end of September.

    • Rain 🌧️

  • Chiang Mai experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 326.6 mm.

    • More

  • Is September a good time to visit Chiang Mai? check out the best time to travel to Chiang Mai page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
0
Dry days
Average rainy days
30
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/22°
Temperatures
Average wind speed
5 km/h
Avg max wind
Average humidity
88 %
Avg humidity

Chiang Mai Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
30°
2
Light rain shower
31°
3
Moderate rain at times
32°
4
Light rain shower
32°
5
Patchy light rain with thunder
31°
6
Moderate rain at times
29°
7
Patchy light rain with thunder
31°
8
Moderate or heavy rain shower
31°
9
Moderate or heavy rain shower
28°
10
Light rain shower
28°
11
Light rain shower
27°
12
Patchy rain possible
29°
13
Patchy rain possible
31°
14
Moderate or heavy rain shower
29°
15
Heavy rain at times
29°
16
Moderate rain
30°
17
Patchy rain possible
32°
18
Moderate rain
31°
19
Moderate rain
30°
20
Heavy rain
29°
21
Patchy rain possible
25°
22
Moderate rain
30°
23
Patchy rain possible
30°
24
Patchy rain possible
32°
25
Moderate rain
29°
26
Patchy rain possible
24°
27
Moderate rain
23°
28
Patchy rain possible
23°
29
Moderate rain
23°
30
Patchy rain possible
29°

Temperatures trend during September in Chiang Mai

See the weather trend as well as the moving average line

September weather in Chiang Mai day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 30° /22° 12.1 mm 7
2 Sept. Light rain shower
Light rain shower
 31° /21° 11 mm 7
3 Sept. Moderate rain at times
Moderate rain at times
 32° /22° 4.7 mm 7
4 Sept. Light rain shower
Light rain shower
 32° /22° 6.5 mm 7
5 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 31° /22° 13.9 mm 7
6 Sept. Moderate rain at times
Moderate rain at times
 29° /21° 12 mm 6
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 31° /21° 14.1 mm 7
8 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 31° /21° 14.1 mm 7
9 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /21° 28.2 mm 6
10 Sept. Light rain shower
Light rain shower
 28° /21° 12.5 mm 6
11 Sept. Light rain shower
Light rain shower
 27° /21° 14.5 mm 6
12 Sept. Patchy rain possible
Patchy rain possible
 29° /20° 2 mm 6
13 Sept. Patchy rain possible
Patchy rain possible
 31° /21° 3.5 mm 7
14 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /21° 9.4 mm 6
15 Sept. Heavy rain at times
Heavy rain at times
 29° /21° 3.7 mm 6
16 Sept. Moderate rain
Moderate rain
 30° /21° 5.8 mm 2.6
17 Sept. Patchy rain possible
Patchy rain possible
 32° /22° 1.1 mm 2.6
18 Sept. Moderate rain
Moderate rain
 31° /22° 5.6 mm 2.1
19 Sept. Moderate rain
Moderate rain
 30° /22° 15.3 mm 2.6
20 Sept. Heavy rain
Heavy rain
 29° /22° 28 mm 2
21 Sept. Patchy rain possible
Patchy rain possible
 25° /22° 4 mm 5
22 Sept. Moderate rain
Moderate rain
 30° /22° 5.4 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 30° /23° 2.9 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
 32° /22° 4.1 mm 6
25 Sept. Moderate rain
Moderate rain
 29° /22° 5.1 mm 5
26 Sept. Patchy rain possible
Patchy rain possible
 24° /22° 1.8 mm 5
27 Sept. Moderate rain
Moderate rain
 23° /20° 13.6 mm 5
28 Sept. Patchy rain possible
Patchy rain possible
 23° /20° 2.1 mm 5
29 Sept. Moderate rain
Moderate rain
 23° /21° 5.1 mm 5
30 Sept. Patchy rain possible
Patchy rain possible
 29° /21° 11 mm 7
Next
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.
Change Month
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Chiang Mai weather in September vs August vs October

Compare September weather in Chiang Mai with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures29°/22°29°/22°29°/20°
Rainfall240 mm327 mm271 mm
Wind5.4 km/h5.4 km/h5.2 km/h
Humidity86%88%86%
Rainy days31 days30 days29 days
Dry days0 days0 days2 days

Planning a trip to Chiang Mai? Discover the best time to visit

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 326.6 mm is expected in Chiang Mai during September, occurring over more than 30 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 5 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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Get accurate weather forecasts for Chiang Mai, located at latitude 18.79 and longitude 98.985. Stay updated with localized weather information tailored for Chiang Mai.

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