Bangkok Weather in September
September in Bangkok averages 34°C (93°F) during the day and 26°C (79°F) at night. It is the wettest month of the year, with 333 mm (13 in) of rainfall on average, so waterproof gear is a must.
Rainfall in Bangkok in September
Bangkok is in the rainy season in September, with rain on around 20 days and an average of 333 mm (13 in). The rain this month falls heavily when it arrives. Late afternoons in particular can see strong showers, so waterproofs are worth keeping handy.
Temperature in Bangkok in September
Expect highs of 34°C (93°F) in Bangkok in September, with nights dropping to around 26°C (79°F). The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. Nights remain warm at around 26°C (79°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.
Sunshine in Bangkok in September
The area enjoys a balanced 155 hours of sunlight, ensuring it's neither too rainy nor too sunny.
Wind Speed in Bangkok in September
Average wind conditions reach 1 m/s (2 knots) in September. This creates generally peaceful weather with subtle air movement. Remember this is an average: some days are windless while others have noticeable or very gentle breezes.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Bangkok. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Thailand, check out our Bangkok's climate page.
Bangkok Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
34°C (93°F)
Chance of Rain
66%
Precipitation
333 mm (13 in)
Rainy days
20 days
Humidity
79%
Windspeed
1 m/s (2 knots)
Sunshine
155 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Bangkok typically stay consistent throughout September, with daily highs averaging around 34°C (93°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Bangkok in September
Browse day-by-day weather records for Bangkok spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Bangkok historical weather extremes in September
Based on weather observations in Bangkok between 1976 and 2025, these are the recorded extremes during September.
- Bangkok recorded its highest September temperature of 39°C (102°F) on September 14, 1997.
- Bangkok experienced its chilliest September day on September 5, 1976, reaching only 26°C (79°F).
- Nighttime temperatures dropped to 22°C (72°F) on September 18, 2001, marking the coldest September night on record.
Best Places in Thailand in September
Find out more about the weather in Thailand and which places have the best travel conditions in this month. See all of Thailand in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Bangkok in September
Get ready for hot weather in September! Lightweight, breathable fabrics are your best friend during this month. Cotton and linen shirts, shorts, sundresses, and sandals will keep you comfortable. Light colors help reflect the heat, avoid wearing black. Also bring a poncho, it will rain a lot! Waterproof everything you can. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Bangkok in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Thailand, check out our Bangkok's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Bangkok climate overview or explore weather in Thailand.
