How hot is Bangkok in September?

Daytime highs in Bangkok in September average 31°C (88°F); nights drop to about 25°C.

Does it rain in Bangkok in September?

Expect around 27.5 rainy days and 320 mm of rainfall in September.

Is September a good time to visit Bangkok?

September is a challenging month to visit Bangkok — consider December–January instead. Overall travel score: 3.4/10. The best months are December–January.

Bangkok weather in September

September is a challenging month to visit Bangkok — consider December–January instead. Expect highs around 31°C, lows near 25°C, and about 27.5 days with rain.

3.4 · Poortravel score for September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Avg high

31°C

Avg low

25°C

Rainfall

320 mm

Rain days

27.5

Sunshine

7.7 h/day

Daylight

12.1 h

What to pack for Bangkok in September

light, breathable clothing
sun protection (hat, SPF 50)
a compact umbrella or rain shell — rain is frequent
expect humid, sticky conditions

Humidity averages 84%; max daily wind around 14 km/h.

How September compares

Best months in Bangkok: December–January. See the full best time to visit Bangkok guide.

Bangkok in September: the details

In September, Bangkok sees average daytime highs of 31°C (88°F) and overnight lows of 25°C (77°F). Rainfall totals roughly 320 mm across 27.5 rainy days, and the sun shines about 7.7 hours per day with 12.1 hours of daylight mid-month. Relative humidity averages 84%.

These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Bangkok, Thailand (13.75, 100.5) — see our methodology. Actual conditions vary year to year.

Where should you go next month?

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