2026 Climate Averages

Weather: Chiang Mai — September

It's a rainy period, but great for indoor activities, museums, and lower prices.

☔ Climate Overview

September is a wet time to visit Chiang Mai. Hot conditions with temperatures reaching 32°C—stay hydrated and seek shade. This is one of the wettest months—waterproof gear is essential. Being off-peak, you'll find better deals and fewer crowds.

6.1
GoTripzi Score Good

Based on weather comfort, crowds, prices, and activity options

Avg High

32°C

Avg Low

25°C

Rainy days

24days

Daylight

12.3h

Feels like 39°C / 31°C — humidity makes it feel warmer

Rainfall

257mm

Sunshine

8.5h/day

Humidity

84%

Very Muggy
Sun Strength

6.2

High
Wind

7 km/h (gusts 23)

Is September a good time to visit Chiang Mai?

It's a rainy period, but great for indoor activities, museums, and lower prices.

Now

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Feels like --
Wind --
Humidity --
UV Index --
Local time —

Air Quality

Travel Context

  • Crowds
    Very Quiet
  • Travel Costs Value Rates

Daylight

Sunrise

06:13

Sunset

18:28

12.3h daylight

Visiting Chiang Mai in September: Pros & Cons

Pros

  • Fewer crowds and better hotel deals

Cons

  • Frequent rain may disrupt outdoor activities
  • High humidity makes the heat feel oppressive

Things to Do in September

Recommended for This Weather

🌅 Early morning sightseeing (before the heat)
🏛️ Museums & galleries
🍳 Cooking classes & food tours
🎭 Cultural tours & local experiences

Chiang Mai Weather by Month

Month Avg High Avg Low Rain Sunshine Humidity UV Index Crowds Condition
Jan 31°C 16°C 1d (3mm) 10.2h
72% Muggy
7 High
Excellent
Feb 33°C 18°C 1d (5mm) 10.6h
63% Moderate
8 Very High
Excellent
Mar 36°C 22°C 2d (9mm) 10.9h
58% Moderate
9.1 Very High
Good
Apr 37°C 25°C 4d (31mm) 10.9h
60% Moderate
9 Very High
Good
May 36°C 26°C 11d (88mm) 10.4h
67% Muggy
8.1 Very High
Good
Jun 34°C 26°C 16d (106mm) 9.4h
73% Muggy
6.9 High
Wet
Jul 33°C 26°C 21d (175mm) 8.5h
77% Muggy
6.5 High
Wet
Aug 32°C 25°C 23d (216mm) 7.5h
82% Very Muggy
6 High
Wet
Sep Current 32°C 25°C 24d (257mm) 8.5h
84% Very Muggy
6.2 High
Wet
Oct 32°C 24°C 17d (155mm) 8.9h
83% Very Muggy
6.2 High
Wet
Nov 31°C 21°C 6d (37mm) 9.4h
82% Very Muggy
6.2 High
Excellent
Dec 30°C 17°C 1d (4mm) 9.8h
79% Muggy
6.2 High
Excellent

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5.612.Dec
5.6

Where to Stay

See hotels, apartments & rentals around Chiang Mai – live prices from Booking.com, Expedia, Vrbo and more

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Chiang Mai

Northern Thai temples with Doi Suthep temple and Old City temples, night markets, elephant sanctuaries, and mountain escapes.

View Full Destination Guide

What to Pack for September

Light, breathable fabrics like cotton and linen are essential. Opt for loose-fitting clothing in light colors to stay cool. A waterproof jacket and shoes are non-negotiable — showers are frequent. Don't forget a wide-brimmed hat and high-SPF sunscreen — the sun is strong.

Tropical Very Quiet

🎒Personalized Packing List

Tell us about your trip and we'll create a custom packing list based on the weather.

Your Packing List

📋Essentials
👕Clothing
👟Footwear
🎒Accessories
🧴Toiletries & Health

Planning a trip to Chiang Mai?

💰 Off-peak — great deals available now

Frequently Asked Questions

Is September a good time to visit Chiang Mai?
September is typically wet for visiting Chiang Mai, with average highs of 32°C and around 24 rainy days. Plan your activities accordingly—outdoor sightseeing is best on dry days, while rainy days are perfect for museums and indoor attractions.
Does it get cold at night in Chiang Mai in September?
Nights stay pleasantly warm in Chiang Mai during September, around 25°C. Light evening wear is sufficient, and outdoor dining is very comfortable. Many locals and visitors enjoy late-night walks and outdoor activities after sunset.
What should I pack for Chiang Mai in September?
With highs of 32°C and lows of 25°C in September, we recommend: Compact umbrella, Waterproof jacket/shell, Water-resistant shoes, Lightweight breathable clothes. Layering is key as temperatures can vary between air-conditioned interiors and outdoors. Comfortable walking shoes are essential for cobblestone streets.
Does it rain a lot in Chiang Mai in September?
Chiang Mai typically sees around 24 rainy days in September. Rain is usually in the form of brief showers rather than all-day downpours, so a compact umbrella is sufficient. Mornings tend to be drier, making them ideal for outdoor sightseeing.
How many hours of daylight are there in Chiang Mai in September?
In September, Chiang Mai gets approximately 12.3 hours of daylight per day. This affects how much sightseeing you can fit in—longer days mean more time for outdoor activities, while shorter days are perfect for cozy museum visits and early dinners.
Is September peak season in Chiang Mai?
No, September is not peak season in Chiang Mai. Expect better value on accommodation, shorter queues at attractions, and fewer tourists at popular spots. This is an excellent time to experience the city like a local and enjoy a more authentic atmosphere.

Weather Data: Based on 2020–2025 historical climate data from Open-Meteo

Solar calculations: SunCalc (timezone: Asia/Bangkok)

Last Updated: February 2026

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