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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.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
5
Dry days
Average rainy days
25
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/22°
Temperatures
Average wind speed
5 km/h
Avg max wind
Average humidity
90 %
Avg humidity

Chiang Rai in September average weather

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Temperatures trend during September in Chiang Rai

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Patchy light rain with thunder
Patchy light rain with thunder
30° /22° 29 mm 7
2 Sept. Torrential rain shower
Torrential rain shower
27° /22° 39 mm 6
3 Sept. Light rain shower
Light rain shower
32° /22° 4.1 mm 7
4 Sept. Light rain shower
Light rain shower
32° /22° 6 mm 7
5 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
32° /22° 23.6 mm 7
6 Sept. Light rain shower
Light rain shower
30° /22° 10.7 mm 7
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
32° /22° 27.9 mm 7
8 Sept. Patchy light rain with thunder
Patchy light rain with thunder
28° /22° 25.1 mm 6
9 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
27° /22° 26.1 mm 6
10 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
26° /21° 24.5 mm 6
11 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
26° /21° 12.8 mm 6
12 Sept. Fog
Fog
28° /21° 4.4 mm 6
13 Sept. Fog
Fog
28° /21° 2.3 mm 7
14 Sept. Fog
Fog
29° /22° 2 mm 7
15 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
30° /21° 3 mm 7
16 Sept. Light rain shower
Light rain shower
31° /21° 10.9 mm 7
17 Sept. Light rain shower
Light rain shower
29° /21° 9.4 mm 7
18 Sept. Light rain shower
Light rain shower
28° /22° 14.7 mm 7
19 Sept. Light rain shower
Light rain shower
28° /21° 5.7 mm 6
20 Sept. Light rain shower
Light rain shower
28° /21° 6.8 mm 6
21 Sept. Patchy light rain with thunder
Patchy light rain with thunder
30° /21° 5.9 mm 7
22 Sept. Patchy light rain with thunder
Patchy light rain with thunder
28° /21° 15.5 mm 6
23 Sept. Mist
Mist
28° /21° 3.4 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
28° /21° 1.9 mm 6
25 Sept. Patchy light rain with thunder
Patchy light rain with thunder
29° /21° 9 mm 7
26 Sept. Fog
Fog
31° /20° 6.5 mm 7
27 Sept. Light rain shower
Light rain shower
28° /21° 5 mm 6
28 Sept. Light rain shower
Light rain shower
28° /21° 8.7 mm 7
29 Sept. Light rain shower
Light rain shower
28° /21° 9.1 mm 7
30 Sept. Light rain shower
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

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Location coordinates 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.

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