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Weather in Ko Si Chang for September 2025

Your guide to Ko Si Chang weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Ko Si Chang has been nearly identical to the historical average, with a temperature of 28.3 °C (showing only a slight deviation of -0.5 °C).

  • The forecast for the next days in Ko Si Chang predicts temperatures to be around 29 °C, close to the historical average.

  • In general, the average temperature in Ko Si Chang at the beginning of September is 28.7 °C. As the month progressed, temperatures tended to remain steady, reaching an average of 28.7 °C by the end of September.

    • Rain 🌧️

  • Ko Si Chang experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 231.4 mm.

    • More

  • Is September a good time to visit Ko Si Chang? check out the best time to travel to Ko Si Chang 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°/27°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Ko Si Chang Weather September

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

Temperatures trend during September in Ko Si Chang

See the weather trend as well as the moving average line

September weather in Ko Si Chang day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Overcast
Overcast
 29° /27° 7.7 mm 6
2 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /25° 33.5 mm 6
3 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /26° 29.3 mm 6
4 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /27° 16.6 mm 6
5 Sept. Overcast
Overcast
 29° /27° 4.2 mm 6
6 Sept. Moderate rain at times
Moderate rain at times
 29° /27° 11.6 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
 29° /26° 21.2 mm 6
8 Sept. Patchy rain possible
Patchy rain possible
 29° /27° 12.9 mm 6
9 Sept. Patchy rain possible
Patchy rain possible
 28° /27° 14.5 mm 6
10 Sept. Moderate rain at times
Moderate rain at times
 29° /27° 11 mm 6
11 Sept. Overcast
Overcast
 29° /27° 1.2 mm 6
12 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 0.3 mm 6
13 Sept. Patchy rain possible
Patchy rain possible
 30° /26° 1.1 mm 2.9
14 Sept. Moderate rain
Moderate rain
 31° /26° 6.4 mm 2.4
15 Sept. Moderate rain
Moderate rain
 29° /26° 8 mm 2.3
16 Sept. Moderate rain
Moderate rain
 28° /25° 15.8 mm 2.2
17 Sept. Heavy rain
Heavy rain
 27° /24° 23.9 mm 0.7
18 Sept. Moderate rain
Moderate rain
 29° /25° 9.2 mm 6
19 Sept. Moderate rain
Moderate rain
 28° /25° 12 mm 6
20 Sept. Heavy rain
Heavy rain
 26° /24° 25.3 mm 6
21 Sept. Patchy rain possible
Patchy rain possible
 29° /26° 2.4 mm 6
22 Sept. Partly cloudy
Partly cloudy
 29° /26° 0.1 mm 7
23 Sept. Patchy rain possible
Patchy rain possible
 30° /26° 1.5 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
 27° /25° 3.5 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
 29° /25° 3.2 mm 6
26 Sept. Patchy rain possible
Patchy rain possible
 29° /25° 1.6 mm 6
27 Sept. Moderate rain at times
Moderate rain at times
 29° /27° 2.4 mm 6
28 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /27° 6.1 mm 6
29 Sept. Patchy rain possible
Patchy rain possible
 29° /27° 0.6 mm 6
30 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /28° 6.2 mm 6
Next
Important Notice
Our weather forecast for Ko Si Chang 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 Ko Si Chang forecast closer to your planned date for the most up-to-date weather information.
Change Month
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›

Ko Si Chang weather in September vs August vs October

Compare September weather in Ko Si Chang 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°/27°29°/27°29°/26°
Rainfall148 mm231 mm247 mm
Wind21.8 km/h22.7 km/h15.5 km/h
Humidity75%75%75%
Rainy days24 days25 days27 days
Dry days7 days5 days4 days

Planning a trip to Ko Si Chang? Discover the best time to visit

Ko Si Chang in September - FAQ

What are the expected maximum and minimum temperatures in Ko Si Chang during September?
During September, expect a variety of temperatures with highs around 29° and lows near 27°, suitable for diverse activities and preferences.
How much rainfall should be expected in Ko Si Chang during September?
Significant rainfall exceeding 231.4 mm is expected in Ko Si Chang during September, occurring over more than 25 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ko Si Chang during September?
The average wind speed in Ko Si Chang during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Ko Si Chang in September?

As you prepare for your trip to Ko Si Chang 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 Ko Si Chang, 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 Ko Si Chang

Explore the daily rainfall trends and prepare for Ko Si Changs September weather 💧

UV exposure in Ko Si Chang during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Ko Si Chang?

Get accurate weather forecasts for Ko Si Chang, located at latitude 13.15 and longitude 100.811. Stay updated with localized weather information tailored for Ko Si Chang.

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