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Weather in Chiang Rai for September 2025

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

    Temperatures

  • Until now, September 2025 in Chiang Rai has been nearly identical to the historical average, with a temperature of 30 °C (showing only a slight deviation of 0.4 °C).

  • The forecast for the next days in Chiang Rai predicts temperatures to be around 30 °C, close to the historical average.

  • In general, the average temperature in Chiang Rai at the beginning of September is 31 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 29.6 °C by the end of September.

    • Rain 🌧️

  • Chiang Rai experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 367.2 mm.

    • More

  • 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
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
90 %
Avg humidity

Chiang Rai Weather September

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

Temperatures trend during September in Chiang Rai

See the weather trend as well as the moving average line

September weather in Chiang Rai day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 30° /21° 23.4 mm 6
2 Sept. Torrential rain shower
Torrential rain shower
 29° /21° 27.8 mm 6
3 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 31° /22° 6.5 mm 7
4 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 32° /22° 6.8 mm 7
5 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 32° /22° 16.5 mm 7
6 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 31° /22° 8.5 mm 7
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 32° /22° 19.3 mm 7
8 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 29° /22° 17.5 mm 6
9 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /22° 18.3 mm 6
10 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /21° 24 mm 6
11 Sept. Light rain shower
Light rain shower
 26° /21° 16.5 mm 6
12 Sept. Fog
Fog
 28° /21° 5.8 mm 6
13 Sept. Fog
Fog
 28° /21° 4 mm 6
14 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 30° /21° 9.3 mm 7
15 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /21° 3 mm 7
16 Sept. Moderate rain
Moderate rain
 31° /21° 9.5 mm 2.7
17 Sept. Patchy rain possible
Patchy rain possible
 31° /22° 3.5 mm 2.5
18 Sept. Moderate rain
Moderate rain
 31° /22° 10.3 mm 2
19 Sept. Moderate rain
Moderate rain
 30° /22° 15.9 mm 2.4
20 Sept. Moderate rain
Moderate rain
 29° /21° 18.9 mm 2.9
21 Sept. Patchy rain possible
Patchy rain possible
 26° /22° 3.3 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 29° /21° 2.1 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 29° /21° 5 mm 5
24 Sept. Patchy rain possible
Patchy rain possible
 31° /22° 1.7 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
 31° /22° 2.3 mm 6
26 Sept. Patchy rain possible
Patchy rain possible
 28° /22° 3.4 mm 5
27 Sept. Patchy rain possible
Patchy rain possible
 30° /21° 0.1 mm 5
28 Sept. Patchy rain possible
Patchy rain possible
 29° /20° 0.6 mm 5
29 Sept. Cloudy
Cloudy
 31° /21° 0.1 mm 5
30 Sept. Light rain shower
Light rain shower
 27° /21° 14.1 mm 6
Next
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.
Change Month
‹
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Chiang Rai weather in September vs August vs October

Compare September weather in Chiang Rai 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
Temperatures28°/22°29°/22°29°/20°
Rainfall415 mm367 mm249 mm
Wind4.9 km/h4.9 km/h4.6 km/h
Humidity91%90%87%
Rainy days29 days30 days31 days
Dry days2 days0 days0 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?
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 367.2 mm is expected in Chiang Rai 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 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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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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