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Thailand weather

Weather in Koh Tao for September 2025

Your guide to Koh Tao weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Koh Tao is slightly cooler than the historical average by -0.6 °C.

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

  • In general, the average temperature in Koh Tao at the beginning of September is 28.6 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 28.9 °C by the end of September.

    • Rain 🌧️

  • Koh Tao experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 207.7 mm.

    • More

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

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

Average dry days
2
Dry days
Average rainy days
28
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/27°
Temperatures
Average wind speed
30 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Koh Tao Weather September

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

Temperatures trend during September in Koh Tao

See the weather trend as well as the moving average line

September weather in Koh Tao day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /26° 10.2 mm 6
2 Sept. Light rain shower
Light rain shower
 28° /26° 13 mm 6
3 Sept. Light rain shower
Light rain shower
 28° /26° 7.7 mm 6
4 Sept. Light rain shower
Light rain shower
 28° /27° 7.6 mm 6
5 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /26° 13.4 mm 6
6 Sept. Light rain shower
Light rain shower
 29° /27° 13.1 mm 6
7 Sept. Cloudy
Cloudy
 29° /27° 3.2 mm 6
8 Sept. Light rain shower
Light rain shower
 29° /27° 1.2 mm 6
9 Sept. Patchy rain possible
Patchy rain possible
 29° /27° 5.4 mm 7
10 Sept. Patchy rain possible
Patchy rain possible
 29° /27° 5.5 mm 6
11 Sept. Overcast
Overcast
 29° /27° 0.9 mm 6
12 Sept. Moderate rain
Moderate rain
 29° /27° 2.2 mm 6
13 Sept. Partly cloudy
Partly cloudy
 29° /26° 9.1 mm 6
14 Sept. Light rain shower
Light rain shower
 28° /26° 12.4 mm 6
15 Sept. Overcast
Overcast
 28° /26° 1.6 mm 6
16 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 2.9 mm 2.8
17 Sept. Patchy rain possible
Patchy rain possible
 30° /28° 0.2 mm 3
18 Sept. Moderate rain
Moderate rain
 29° /27° 7.7 mm 2.3
19 Sept. Patchy rain possible
Patchy rain possible
 28° /27° 0.7 mm 1.4
20 Sept. Patchy rain possible
Patchy rain possible
 30° /28° 1.2 mm 2
21 Sept. Patchy rain possible
Patchy rain possible
 30° /28° 0.4 mm 6
22 Sept. Partly cloudy
Partly cloudy
 29° /28° 0.1 mm 7
23 Sept. Patchy rain possible
Patchy rain possible
 30° /28° 0.1 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
 28° /28° 1.2 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
 28° /27° 1.9 mm 6
26 Sept. Partly cloudy
Partly cloudy
 29° /29° 0 mm 7
27 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 1.2 mm 6
28 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 0.6 mm 6
29 Sept. Patchy rain possible
Patchy rain possible
 29° /28° 0.3 mm 6
30 Sept. Partly cloudy
Partly cloudy
 30° /27° 0.2 mm 7
Next
Important Notice
Our weather forecast for Koh Tao 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 Koh Tao forecast closer to your planned date for the most up-to-date weather information.
Change Month
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›

Koh Tao weather in September vs August vs October

Compare September weather in Koh Tao 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°28°/27°28°/27°
Rainfall145 mm208 mm256 mm
Wind25.4 km/h30.4 km/h21.1 km/h
Humidity74%75%75%
Rainy days30 days28 days30 days
Dry days1 days2 days1 days

Planning a trip to Koh Tao? Discover the best time to visit

Koh Tao in September - FAQ

What are the expected maximum and minimum temperatures in Koh Tao during September?
During September, expect a variety of temperatures with highs around 28° and lows near 27°, suitable for diverse activities and preferences.
How much rainfall should be expected in Koh Tao during September?
Significant rainfall exceeding 207.7 mm is expected in Koh Tao during September, occurring over more than 28 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Koh Tao during September?
The average wind speed in Koh Tao during September is 30 km/h, suggesting breezy to windy conditions, depending on your activities.

Koh Tao water temperatures in September

The average water temperature of the Gulf of Thailand near Koh Tao in September is 27.6 °C. Temperatures remain fairly consistent throughout the month.

What is the water temperature in Koh Tao in September?
The average water temperature in Koh Tao in September is 27.6 °C.
Can you swim in Koh Tao in September?
Ideal conditions for families and casual swimmers. You can stay in for long swims or reef explorations with no thermal protection required.

What to pack to Koh Tao in September?

As you prepare for your trip to Koh Tao 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 Koh Tao, 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
  • 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 Koh Tao

Explore the daily rainfall trends and prepare for Koh Taos September weather 💧

UV exposure in Koh Tao 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 Koh Tao?

Get accurate weather forecasts for Koh Tao, located at latitude 10.098 and longitude 99.838. Stay updated with localized weather information tailored for Koh Tao.

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