Weather in Bangkok for September 2025
In general, the average temperature in Bangkok 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.
Bangkok experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
Is September a good time to visit Bangkok? check out the best time to travel to Bangkok page.
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Bangkok 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 Bangkok
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 Bangkok in September
September in Bangkok, Thailand, is characterized by its monsoon season, bringing heavy rainfall and high humidity. At the beginning of the month, the weather is typically warm and wet. Daytime temperatures generally range from 25° to 32°, with frequent afternoon and evening thunderstorms.
The humidity levels are high, often exceeding 80%, making the air feel even warmer.
As the month progresses, the rainfall continues, but there are occasional breaks in the downpours. The temperatures remain fairly consistent, with daytime highs still hovering around 30° to 32°. Nighttime temperatures are slightly cooler, usually between 24° and 26°.
The humidity remains high throughout the month, contributing to a muggy atmosphere.
By the end of September, the intensity of the monsoon rains may start to decrease slightly, but the weather remains unpredictable. The skies are often overcast, and sudden, heavy showers can occur with little warning.
Despite the rain, there are still periods of sunshine, providing brief respites from the otherwise wet conditions.
Overall, September in Bangkok is a month of warm temperatures and significant rainfall. Visitors should be prepared for wet weather and high humidity, making lightweight, breathable clothing and waterproof gear essential for comfort.
Bangkok in September - FAQ
What to pack to Bangkok in September?
As you prepare for your trip to Bangkok 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 Bangkok, 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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