Thailand

Bangkok in September: weather & travel advice

This month's data profile

Rain shapes the decision

Bangkok in September is climatically mixed. The average daily high is around 31 °C. With about 27 rainy days it is very wet.

Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.

Rank among 12 monthly averages

39/100 · #8

Warmth

#10

Dryness

#12

Sun

Published best categories: none

Bangkok · SeptemberPhoto: Supanut Arunoprayote · CC BY 4.0

Average high: 31 °C
Average low: 24 °C
Rainy days (est.): 27 rainy days (est.)
Sun (est.): 6 h/day
Humidity: 86 %

Climate evidence with direct month comparison

The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.

Climate averages for Bangkok: selected and adjacent months
Month	Avg high °C	Avg low °C	Rainy days (est.)	Precipitation mm	Sun h/day (est.)	Humidity %	Wind m/s	Score
August	31	24	25	189	6.3	82	2.0	36
September (selected)	31	24	27	286	6.2	86	1.6	39
October	30	24	23	200	6.1	85	1.4	40

How do the previous and next months compare?

Baseline: September (39/100)

Positive and negative values show the change from the selected month.

	Score Δ	Average high Δ	Average low Δ	Rainy days Δ	Rain Δ	Sun Δ	Humidity Δ	Wind Δ
August	-3	+0.9 °C	+0.1 °C	-1.7	-96.6 mm	+0.1 h	-3.1 %	+0.4 m/s
October	+1	-0.1 °C	-0.6 °C	-4.4	-85.6 mm	-0.1 h	-0.6 %	-0.2 m/s

All twelve months in context

JanGood66 FebLimited60 MarLimited54 AprUnsuitable44 MayUnsuitable31 JunUnsuitable34 JulUnsuitable36 AugUnsuitable36 SepUnsuitable39 OctUnsuitable40 NovGood69 DecGood74

Rainy days (estimated)

Sunshine hours (estimated)h/day

Average daily high°C

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Useful next decisions

Bangkok · Month by month

Siem Reap · September Ho Chi Minh City · September Mérida · September Udaipur · September

Frequently asked questions

How warm is Bangkok in September?

The average daily high is around 31 °C, with an average daily low of about 24 °C.

Does it rain a lot in Bangkok in September?

The curated estimate is about 27 rainy days per month, not a directly measured long-term average. Total precipitation averages around 286 mm for the month. A rainy day does not mean all-day rain.

When is the best time to visit Bangkok?

By the climate score, January, February, November and December are the strongest months for Bangkok. September is not among them.