Verdict: Fair month
Bangkok Weather in September
September runs warm in Bangkok, with daily highs around 31°C (88°F) and nights near 25°C (77°F). It's also the wet side of the calendar: rain falls on about 28 days, so build flexibility into plans. September is workable in Bangkok if your dates are fixed — just plan around the conditions.
Average high
31°C / 88°F
Average low
25°C / 77°F
Rain days
~28
Precipitation
336 mm
What to pack for Bangkok in September
- Light, breathable clothing — linen and technical fabrics earn their keep
- High-SPF sunscreen, sunglasses, and a refillable water bottle
- Rain gear is non-negotiable — expect rain on roughly 28 days
- Quick-dry shoes — downpours are short but heavy
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Bangkok: Apr (34°C / 93°F) · Coolest: Sep (31°C / 88°F) · Wettest: Sep (~28 rain days)
32°
22°
Jan
33°
24°
Feb
33°
26°
Mar
34°
27°
Apr
34°
27°
May
33°
26°
Jun
32°
26°
Jul
32°
26°
Aug
31°
25°
Sep
31°
24°
Oct
31°
24°
Nov
31°
22°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)