September in Bangkok averages highs of 31 °C (88 °F) and lows of 25 °C (77 °F), with about 24 rainy days and 12 h 11 min of daylight.
September weather in Bangkok at a glance
average high to low each dot ≈ 3 rainy days
Is September a good time to visit Bangkok?
Tough month: hot and wet. September is usually low season in Bangkok: rooms are typically easier to find and cheaper.
Our rule: a month scores 2 points for comfortable average highs of 18–28 °C (1 point for 14–18 or 28–32 °C) and 2 points for 5 or fewer rainy days (1 point for 6–10). Average highs above 35 °C or below 8 °C make it a tough month whatever the rain. A rainy day here means 2 mm of rain or more. 4 points = great, 3 = good, 2 = mixed, 0–1 = tough.
Holidays and events in September 2026
We found no major holidays or events for September in Bangkok. Our holiday source does not cover Thailand, so check official listings before you go.
Things to do in Bangkok in September
With frequent rain in September, here are the indoor picks first, then the outdoor ones for drier spells.
- Grand Palace and Wat Phra Kaew — dress code applies indoors
- Wat Pho — reclining Buddha indoors
- Wat Arun — best from the river at sunset outdoors
- Chao Phraya boats outdoors
- Chatuchak weekend market — go early outdoors
- Chinatown (Yaowarat) at night — street food outdoors
Where to stay: Riverside or Old Town (Rattanakosin) for temples; Sukhumvit for food and the BTS; Silom for nightlife.
What to pack for Bangkok in September
- Light, breathable clothes, a hat and a water bottle: highs reach 31 °C (88 °F), so plan indoor time around midday.
- An umbrella or a light waterproof: about 24 days this month see real rain.
- Clothes that cover shoulders and knees for mosques and temples.
- Comfortable walking shoes.
What a day in Bangkok costs
| Budget traveller | Mid-range | |
|---|---|---|
| Typical total per person, per day | €25–65 | €80–200 |
Excluding flights. September is usually low season in Bangkok: rooms are typically easier to find and cheaper.
September in nearby cities
| City | High / low | Rainy days | Verdict |
|---|---|---|---|
| Singapore | 30° / 25° | 19 | Tough month |
| Bali | 28° / 23° | 11 | Mixed weather |
| Kyoto | 28° / 20° | 12 | Mixed weather |
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FAQ
Is September a good time to visit Bangkok?
By the numbers, September is a tough month: hot and wet, with average highs of 31 °C (88 °F) and about 24 rainy days. September is usually low season in Bangkok: rooms are typically easier to find and cheaper. The best months for weather are January, December.
How warm is Bangkok in September?
Average highs are 31 °C (88 °F) and lows 25 °C (77 °F) (2015–2024 averages).
Does it rain a lot in Bangkok in September?
Expect about 24 days with 2 mm of rain or more, about 293 mm in total. It is the wettest month of the year in Bangkok.
Sources: climate averages from Open-Meteo historical weather (ERA5 reanalysis, 2015–2024); sea temperatures from the Open-Meteo marine API (2023–2024); public holidays from Nager.Date. Daylight is calculated for the 15th of the month. Averages are a guide, not a forecast. Costs are typical ranges per person per day, excluding flights. In the tropics, reanalysis data tends to count more light-rain days than local weather stations do; rain there often comes as short afternoon downpours.