When to go · Bangkok
Bangkok in September
Avoid month. Wettest month; street flooding in low areas after storms.
Key facts
- Verdict
- Avoid
- Temperature
- 32°C (90°F)90°F (32°C) / 25°C (77°F)77°F (25°C)
- average high / low
- Rain days
- 21
- Crowds
- Low
- Thailand overall
- Prices
- Low
- Thailand overall
Verdict
Wettest month; street flooding in low areas after storms.
All twelve months in one grid — weather, crowds and prices, with gaps left as unknown.
Is another month better than September?
September is rated avoid. These months rate higher:
Weather in September
- BangkokHighs around 32 °C (90 °F), lows around 25 °C (77 °F), rain on about 21 daysHighs around 90 °F (32 °C), lows around 77 °F (25 °C), rain on about 21 days
- Bangkok and centre, Thailand · Bangkok, Ayutthaya, Kanchanaburirainy
Cool season Nov–Feb is the easy window; April reaches 38 °C (100 °F); September and October bring street flooding in short bursts.Cool season Nov–Feb is the easy window; April reaches 100 °F (38 °C); September and October bring street flooding in short bursts.
Rainy season season
Green parks, cleaner air, lower hotel prices, fewer tourists; short storms that cool the evenings.
Watch: Street flooding after storms; September is the wettest; boats and bike tours can cancel.
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Vegetarian (Jay) Festival check
First nine days of the 9th Chinese lunar month · Yaowarat and Talat Noi
Yellow flags mark meat-free stalls; Chinatown classics in vegan versions.
Crowds and prices
- Crowds · Thailand overall
- Low
- Prices · Thailand overall
- Low
Thailand overall: Wettest month in Bangkok and on the Andaman coast; flooding in low areas. Only for low prices.
Compare two months
Weather, crowds and prices for any two months in Bangkok, side by side.
Verdict
Sep: Avoid
Jan: Great (better)
Daytime high
Sep: 32 °C (90 °F)90 °F (32 °C)
Jan: 32 °C (90 °F)90 °F (32 °C)
Night low
Sep: 25 °C (77 °F)77 °F (25 °C)
Jan: 22 °C (72 °F)72 °F (22 °C)
Rain days
Sep: 21
Jan: 2 (better)
Crowds
Sep: Low
Jan: High
Prices
Sep: Low
Jan: High
Festivals listed
Sep: 1
Jan: 3
September: Wettest month; street flooding in low areas after storms.
January: Cool (for Bangkok) and dry; high season; smog on still days (check AQI).
Bangkok: figures are long-term averages from this guide, not a forecast.
What to pack
- Light, breathable clothes, a sun hat and sunscreen
- A rain jacket or umbrella and shoes that dry fast