Chiang Mai weather in September
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Chiang Mai September weather at a glance
In September, Chiang Mai averages 26.4°C, with typical highs of 30.1°C and lows of 23.4°C. The historical average is 27 wet days and 86% humidity.
Chiang Mai September temperature & humidity
Chiang Mai September rain & wet days
Pack a light rain jacket, waterproof pouch and quick-dry shoes. Keep an indoor stop available between outdoor activities.
What to wear in Chiang Mai in September
Expect intense heat. Pack lightweight quick-dry clothing, sun protection and a refillable bottle. Rain is frequent at roughly 27 days in the month; pack a rain jacket and water-resistant shoes. High humidity makes quick-dry clothing and a spare top especially useful.
- DaytimeBreathable short sleeves, hat and sunscreen · average high 30.1°C
- Morning & eveningLight layer for air-conditioned rooms · average low 23.4°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Chiang Mai September sunrise & sunset times
2026 September · Local time (Asia/Bangkok)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-09-01 | 06:09 | 18:39 | 12h 30m |
| 2026-09-15 | 06:12 | 18:27 | 12h 15m |
| 2026-09-30 | 06:14 | 18:14 | 11h 59m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
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Chiang Mai rainy season & dry season
Is September wet or dry?
Thailand’s southwest monsoon generally brings rain from mid-May to mid-October. The southern east coast also receives northeast-monsoon rain, so Koh Samui and Phuket do not share one wet/dry-season calendar. The 2024–2025 average for September is 27 wet days.
2024–2025 wet-day averages, not long-term season boundaries. Wet days do not mean all-day rain.
Packing for rainy and dry periods
For rainy periods, bring a light rain jacket, a waterproof pouch and quick-dry clothes. In drier months, pack sunscreen and a hat, plus a compact umbrella for showers. For beach trips, check the boat operator’s weather and cancellation notices.
Season guide: Thailand Government
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Best months to visit Chiang Mai
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
September weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Chiang Mai weather like in September?
In September, Chiang Mai averages 26.4°C, with typical highs of 30.1°C and lows of 23.4°C. The historical average is 27 wet days and 86% humidity. Our weather-comfort rating for this month is challenging.
Does it rain a lot in Chiang Mai in September?
There are about 27 wet days in September. Pack a rain jacket and water-resistant shoes.
What should I wear in Chiang Mai in September?
Expect intense heat. Pack lightweight quick-dry clothing, sun protection and a refillable bottle. Rain is frequent at roughly 27 days in the month; pack a rain jacket and water-resistant shoes. High humidity makes quick-dry clothing and a spare top especially useful.
What are the best months to visit Chiang Mai?
Recent weather data rates January, February, March, November among the more comfortable months.
Where can I check Chiang Mai weather in September in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
Is September rainy or dry season in Chiang Mai?
Thailand’s southwest monsoon generally brings rain from mid-May to mid-October. The southern east coast also receives northeast-monsoon rain, so Koh Samui and Phuket do not share one wet/dry-season calendar. The 2024–2025 average for September is 27 wet days.
Which months have fewer rainy days in Chiang Mai?
In our 2024–2025 data, February, March, December have the fewest wet days. These are recent observations, not long-term climate normals. Compare temperatures and your planned activities as well.
What time are sunrise and sunset in Chiang Mai in September?
On 2026-09-15, calculated sunrise is 06:12 and sunset is 18:27 in local time (Asia/Bangkok). Times vary by date and terrain.
Chiang Mai weather by month
More Southeast Asia destinations in September
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations