Weather in Thailand for September 2025
In general, the average temperature in Thailand at the beginning of September is 33 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 31.4 °C by the end of September.
Thailand experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
Is September a good time to visit Thailand? check out the best time to travel to Thailand page.
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Thailand in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  34° | 2  33° | 3 33° | 4 33° | 5  31° | 6 33° | 7 34° |
| 8 32° | 9 32° | 10 33° | 11  32° | 12 30° | 13 31° | 14 31° |
| 15 31° | 16 31° | 17 32° | 18 30° | 19 32° | 20  33° | 21  33° |
| 22 32° | 23 33° | 24 33° | 25 31° | 26 32° | 27 30° | 28 31° |
| 29 30° | 30 33° |
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Temperatures trend during September in Thailand
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Overcast | 34° /25° | 12.8 mm | 7 | |
| 2 Sept. | Patchy rain possible | 33° /25° | 22.1 mm | 7 | |
| 3 Sept. | Light rain shower | 33° /25° | 8 mm | 7 | |
| 4 Sept. | Patchy rain possible | 33° /25° | 4.4 mm | 7 | |
| 5 Sept. | Moderate or heavy rain shower | 31° /25° | 11.1 mm | 7 | |
| 6 Sept. | Light rain shower | 33° /25° | 2 mm | 7 | |
| 7 Sept. | Overcast | 34° /25° | 2.3 mm | 7 | |
| 8 Sept. | Light rain shower | 32° /26° | 1 mm | 7 | |
| 9 Sept. | Patchy rain possible | 32° /25° | 1.1 mm | 7 | |
| 10 Sept. | Patchy rain possible | 33° /26° | 1.1 mm | 7 | |
| 11 Sept. | Light drizzle | 32° /26° | 2 mm | 7 | |
| 12 Sept. | Overcast | 30° /25° | 0.9 mm | 7 | |
| 13 Sept. | Overcast | 31° /25° | 7 mm | 7 | |
| 14 Sept. | Overcast | 31° /25° | 3.7 mm | 7 | |
| 15 Sept. | Overcast | 31° /24° | 0.1 mm | 7 | |
| 16 Sept. | Light rain shower | 31° /25° | 3.1 mm | 7 | |
| 17 Sept. | Light rain shower | 32° /25° | 3.2 mm | 7 | |
| 18 Sept. | Patchy rain possible | 30° /25° | 6.8 mm | 7 | |
| 19 Sept. | Light rain shower | 32° /25° | 4.2 mm | 7 | |
| 20 Sept. | Cloudy | 33° /25° | 1 mm | 8 | |
| 21 Sept. | Thundery outbreaks possible | 33° /26° | 4 mm | 7 | |
| 22 Sept. | Light rain shower | 32° /26° | 3.7 mm | 7 | |
| 23 Sept. | Light rain shower | 33° /26° | 5.4 mm | 7 | |
| 24 Sept. | Light rain shower | 33° /26° | 7.6 mm | 7 | |
| 25 Sept. | Light rain shower | 31° /25° | 13.5 mm | 7 | |
| 26 Sept. | Light rain shower | 32° /25° | 8.5 mm | 7 | |
| 27 Sept. | Light rain shower | 30° /25° | 5.2 mm | 7 | |
| 28 Sept. | Light rain shower | 31° /25° | 7.4 mm | 7 | |
| 29 Sept. | Moderate or heavy rain shower | 30° /26° | 6.4 mm | 7 | |
| 30 Sept. | Light rain shower | 33° /25° | 9 mm | 7 | |
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Guide for Thailand in September
In September, Thailand experiences a transition from the rainy season to the beginning of the dry season. At the start of the month, the weather in Thailand is still influenced by the southwest monsoon, bringing intermittent rainfall and high humidity.
The southern and central regions, including popular tourist destinations like Phuket and Bangkok, can expect frequent showers and occasional thunderstorms. The temperatures typically range from 25° to 32° in these areas, with the humidity making it feel warmer.
As the month progresses, the weather gradually improves, with the rainfall becoming less frequent towards the end of September. The northern regions, such as Chiang Mai, begin to experience drier and more comfortable conditions, with temperatures ranging from 22° to 33°.
The southern islands, including Koh Samui and Krabi, also start to see a decrease in rainfall, making it a great time to visit for beach activities and water sports.
Overall, September in Thailand offers a mix of rainy and transitioning dry weather, making it important for travelers to pack accordingly and be prepared for some wet days, especially at the beginning of the month.
Thailand in September - FAQ
What to pack to Thailand in September?
As you prepare for your trip to Thailand 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 Thailand, 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
- Insect Repellent: For destinations with mosquitos or other insects
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