Middle of the wetter season · Weather & things to do
Bangkok in September
The year's rain peaks now, with about 10.9 in (278 mm) falling in Bangkok, alongside highs near 87°F (30°C) and lows of 75°F (24°C).
With a comfort score of 31/100 (12th of 12), it's one of the toughest months, held back mainly by rain.
- Avg high
- 87°F (30°C)
- Avg low
- 75°F (24°C)
- Rain
- 10.9 in (278 mm)
- Humidity
- 85%
- Cloud cover
- 91%
- Daylight
- ~12 h 04 min
- Comfort score
- 31/100 · Tough
What September feels like
Heat sets the pace, with highs around 87°F (30°C). Get out early and keep the hottest hours for somewhere cool.
Even at night it stays warm, around 75°F (24°C).
Humidity averages 85%, so the air feels sticky and the heat feels stronger than the thermometer says.
It's a very wet month, with around 10.9 in (278 mm) of rain, so keep plans flexible and have indoor backups ready.
Skies are often grey, with average cloud cover around 91%.
Plan around September
September is one of the lower-scoring months here; the best are December & January.
- Inside the wettest three-month stretch, August – October.
- Comfort slips from 37/100 in August to 31/100.
- Our Bangkok to the Andaman route recommends Nov – Mar, so September falls outside its suggested window.
What to pack for September
- Light, breathable clotheshighs average 87°F
- Sun hat and sunscreenmidday heat
- Refillable water bottleeasy to dehydrate in the heat
- Quick-dry fabrics85% average humidity
- Rain jacket and waterproof shoes10.9 in of rain on average
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Bangkok in September
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
Thipsamai Pad Thai
Famous pad thai shop since 1966, including a version wrapped in egg.
Why now A sit-down stop to wait out showers in a month with 10.9 in of rain.
Chatuchak Weekend Market
Huge weekend market with over 10,000 stalls selling clothes, crafts and food.
Why now An indoor-leaning stop for a month with 10.9 in of rain.
Lumphini Park
Downtown park with a lake, paddle boats and monitor lizards.
Why now Go early — afternoons average 87°F.
Sky Bar at Lebua
Open-air bar 63 floors up on the State Tower, overlooking the river.
Why now Best first thing, before the 87°F afternoon heat.
Wat Pho
Temple of the 46-meter Reclining Buddha and a famous traditional massage school.
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Bangkok in September: quick answers
Is September a good time to visit Bangkok?
It's one of the tougher months here, scoring 31/100, held back mainly by rain. The best months are December & January. Expect highs of 87°F (30°C) and 10.9 in (278 mm) of rain. Our Bangkok to the Andaman route recommends Nov – Mar, so September is outside its suggested window.
How hot is Bangkok in September?
Average highs are 87°F (30°C) and average lows 75°F (24°C), making it the 3rd-coldest month by daytime highs.
Does it rain a lot in Bangkok in September?
Yes: about 10.9 in (278 mm) of rain falls across September on average, the wettest month of the year. The annual total is about 53.6 in (1361 mm).
What should I pack for Bangkok in September?
Bring light, breathable clothes (highs average 87°F), sun hat and sunscreen (midday heat), refillable water bottle (easy to dehydrate in the heat), quick-dry fabrics (85% average humidity) and rain jacket and waterproof shoes (10.9 in of rain on average).
Planning Bangkok in September?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.