Bangkok · September
Run in the pre-dawn.
Average high is 88°F with a 77°F overnight low. Humidity averages 83% — the limiting factor on most runs. Expect 28 rain days — plan around the radar. Humid heat punishes mid-morning — get out before sunrise for the only truly comfortable window.
Avg high / low
88° / 77°F
Humidity
83%
Rain days
28/mo
Wind
8 mph
What September feels like in Bangkok
Sunrise
06:06
Mid-month average
Sunset
18:19
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Heat peaks here. Skip unless you've got shade and pace tolerance.
Evening
Cools off after sunset but still warm. Good for easy efforts; avoid hard intervals if you're chasing pace.
What to wear running in Bangkok in September
The kit for September in Bangkok: light, breathable, and moisture-wicking — singlet or short-sleeve only, a water-resistant cap or jacket on standby.
September vs the surrounding months
vs August
-1° avg high
-1 rain days
Bangkok in August →
September
88°F avg high
28 rain days
Best: pre-dawn
vs October
+1° avg high
+2 rain days
Bangkok in October →
Frequently Asked Questions
What is the best time of day to run in Bangkok in September?+
Pre-dawn. Humid heat punishes mid-morning — get out before sunrise for the only truly comfortable window.
What's the average temperature in Bangkok in September?+
Average high 88°F, average low 77°F.
How does September compare to surrounding months in Bangkok?+
Compared to August (avg high 89°F), September is cooler. Compared to October (avg high 87°F), September is warmer.
Does it rain often in Bangkok in September?+
Expect about 28 measurable rain days in September, on average.