Weather in Chiang Mai in September
Chiang Mai, Thailand averages a high of 29.3°C (84.7°F) and low of 23°C (73.4°F) in September, with 23 rain days and 8.5 hours of daily sunshine. Travel score: 63.9/100 (Good). The best time to visit Chiang Mai is February.
High
29°C85°F
Low
23°C73°F
🌧️
23
rain days
☀️
8.5
hrs/day sunshine
💧
87%
humidity
64— Good
September in Chiang Mai is hot and very rainy — pack an umbrella and enjoy indoor attractions too.
What are the average temperatures in Chiang Mai?
How much does it rain in Chiang Mai in September?
Chiang Mai receives an average of 260.3mm of rainfall across 23 rainy days in September. The annual total is 1257.4mm.
What should I pack for Chiang Mai in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 29°C
🧥
Waterproof jacket
Frequent rain expected (23 rainy days)
☔
Umbrella
Essential for the rainy season
👢
Waterproof shoes
Keep your feet dry in wet conditions
🧴
Sunscreen SPF 30+
9 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to Thailand in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31