Chiang Mai weather in September
Chiang Mai in September averages 28°C (82°F), 218 mm of rain and 5.1 hours of sun a day. It is one of the wetter months of the year here.
Of the twelve months in Chiang Mai, September is the fifth warmest and the second wettest.
- Average temp
- 28°C (82°F)
24–32°C · 75–90°F
- Rainfall
- 218 mm
A wet month
- Sunshine
- 5.1 h
hours per day
What is Chiang Mai like in September?
Daytime
Days are hot, often above 32°C.
Rain
Expect frequent rain — this is a wet month.
Evening
Evenings stay warm.
What should I pack for Chiang Mai in September?
High-factor sun cream
With daytime highs around 32°C, burn time is short even in shade.
Sunglasses and a brimmed hat
Midday glare is the part people underpack for, not the heat itself.
Loose cotton or linen
Synthetics stop working once you are sweating through them all day.
A refillable water bottle
Daily highs this warm need roughly double the water a temperate day does.
A proper waterproof, not a folding umbrella
218 mm in the month usually arrives as heavy bursts that an umbrella will not cover.
A dry bag for phone and documents
Worth it for one downpour caught between the taxi and the door.
September compared with August and October
September in Chiang Mai is about the same temperature as August and 16 mm drier than it, which averages 28°C (82°F).
September in Chiang Mai is 0.6°C warmer than October and 100 mm wetter than it, which averages 27°C (81°F).
Daylight in Chiang Mai in September
On 15 September the sun is up for 12 hours 15 minutes in Chiang Mai, rising about 06:11 and setting about 18:26 local time.
September ends 30 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 1 hour short of June, the longest-lit month here.
Where to stay in Chiang Mai
Dates are a starting point for September.
Travel guides for Chiang Mai
What to read before you book.
Chiang Mai weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 23°C / 73°F | 8 mm |
| February | 25°C / 77°F | 9 mm |
| March | 28°C / 82°F | 22 mm |
| April | 30°C / 86°F | 56 mm |
| May | 29°C / 85°F | 164 mm |
| June | 29°C / 84°F | 111 mm |
| July | 28°C / 83°F | 153 mm |
| August | 28°C / 82°F | 234 mm |
| September | 28°C / 82°F | 218 mm |
| October | 27°C / 81°F | 118 mm |
| November | 26°C / 78°F | 39 mm |
| December | 23°C / 74°F | 14 mm |
Similar weather in September
Other destinations whose September averages sit close to this one.
Check another month
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FAQs about Chiang Mai in September
September climate averages for Chiang Mai, 1991–2020.
Chiang Mai averages 28°C (82°F) in September, ranging from about 24°C (75°F) at night to 32°C (90°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Yes, a lot. September brings about 218 mm, which makes it one of the wetter months here — expect heavy bursts rather than all-day drizzle.
Yes. September averages 28°C (82°F) against 27°C (81°F) in October — 0.6°C warmer.
September is about as warm as August, and 16 mm drier.
It is outside the easiest window. The most comfortable stretch here is October to March; September sits outside it, which usually means more heat, more rain, or both — worth it if you would rather have the place to yourself.
About 5.1 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 15 minutes of daylight in mid-September, against 13 hours 15 minutes in June and 11 hours 1 minute in December.
On 15 September, sunrise is about 06:11 and sunset about 18:26 local time. Both shift across the month — the month ends 30 minutes shorter than it starts.
