Thailand weather in September
Thailand in September averages 29°C (85°F), 331 mm of rain and 4.5 hours of sun a day. It is one of the wetter months of the year here.
Of the twelve months in Thailand, September is the fifth coldest, the wettest and the second dullest.
- Average temp
- 29°C (85°F)
26–33°C · 78–92°F
- Rainfall
- 331 mm
A wet month
- Sunshine
- 4.5 h
hours per day
What is Thailand 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 Thailand in September?
High-factor sun cream
With daytime highs around 33°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
331 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 Thailand is about the same temperature as August and 104 mm wetter than it, which averages 30°C (85°F).
September in Thailand is about the same temperature as October and 55 mm wetter than it, which averages 29°C (85°F).
Daylight in Thailand in September
On 15 September the sun is up for 12 hours 12 minutes in Thailand, rising about 06:06 and setting about 18:19 local time.
September ends 22 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 44 minutes short of June, the longest-lit month here.
Travel guides for Thailand
What to read before you book.
Thailand 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 | 28°C / 83°F | 18 mm |
| February | 30°C / 85°F | 22 mm |
| March | 31°C / 87°F | 43 mm |
| April | 32°C / 89°F | 92 mm |
| May | 31°C / 88°F | 221 mm |
| June | 30°C / 87°F | 187 mm |
| July | 30°C / 86°F | 184 mm |
| August | 30°C / 85°F | 227 mm |
| September | 29°C / 85°F | 331 mm |
| October | 29°C / 85°F | 276 mm |
| November | 29°C / 84°F | 42 mm |
| December | 28°C / 82°F | 7 mm |
Similar weather in September
Other destinations whose September averages sit close to this one.
Check another month
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FAQs about Thailand in September
September climate averages for Thailand, 1991–2020.
Thailand averages 29°C (85°F) in September, ranging from about 26°C (78°F) at night to 33°C (92°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 331 mm, which makes it one of the wetter months here — expect heavy bursts rather than all-day drizzle.
They are about the same. September averages 29°C (85°F) and October 29°C (85°F), so temperature alone will not decide between them.
September is about as warm as August, and 104 mm wetter.
It is outside the easiest window. The most comfortable stretch here is November 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 4.5 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 12 minutes of daylight in mid-September, against 12 hours 56 minutes in June and 11 hours 19 minutes in December.
On 15 September, sunrise is about 06:06 and sunset about 18:19 local time. Both shift across the month — the month ends 22 minutes shorter than it starts.
