Weather in Chiang Mai in September
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for September in Chiang Mai.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youChiang Mai in September is hot — daytime temperatures average 29.4°C, dropping to 23.2°C at night. The month is extremely wet, with heavy downpours most days, with roughly 8.6 hours of sunshine a day. It is one of the best months of the year to visit. For the complete picture, see the best time to visit Chiang Mai — every month compared. Once you know when to go, find your Chiang Mai packing list at 247PackingList.
Get ready for Chiang Mai in September
Search flights to Chiang Mai
Compare 100+ airlines for September — one search, best price.
Search Flights →Travel clothing layers
Pack layers — temperatures can vary significantly between day and night.
Check Price →What to pack for Chiang Mai in September
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
- Compact travel umbrella
- Waterproof jacket
- Quick-dry clothing
Compare all months in Chiang Mai
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 27.7°C | 12.1mm | 10/10 |
| February | 30.0°C | 47.1mm | 10/10 |
| March | 34.5°C | 15.3mm | 10/10 |
| April | 34.8°C | 94.1mm | 10/10 |
| May | 33.7°C | 191.0mm | 9/10 |
| June | 31.9°C | 219.9mm | 8/10 |
| July | 30.7°C | 343.1mm | 8/10 |
| August | 29.6°C | 416.6mm | 8/10 |
| September | 29.4°C | 424.5mm | 8/10 |
| October | 28.9°C | 203.4mm | 8/10 |
| November | 29.0°C | 64.5mm | 10/10 |
| December | 27.4°C | 20.8mm | 10/10 |
Full month-by-month guide: best time to visit Chiang Mai →
For facts about Thailand — currency, language and dialling code — see our Thailand country guide at 247CountryInfo. Travellers also find it useful to keep a Chiang Mai travel guide to hand. Check clothing sizes in Thailand before you shop.
Frequently Asked Questions
Is September a good time to visit Chiang Mai?
September rates 8/10 for visiting Chiang Mai — good time to visit. Expect average highs of 29.4°C, 424.5mm of rain across the month and about 8.6 hours of daily sunshine.
What is the temperature in Chiang Mai in September?
In September, Chiang Mai has average highs of 29.4°C (84.9°F) and average lows of 23.2°C (73.8°F).
Does it rain in Chiang Mai in September?
Yes — September is one of the wetter months in Chiang Mai, averaging 424.5mm of rain over roughly 26 rainy days. Pack for heavy showers.
What should I wear in Chiang Mai in September?
For Chiang Mai in September (29.4°C highs / 23.2°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts, compact travel umbrella.
More essentials for Chiang Mai in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.