Chiang Mai in September 2025 [Weather? Things to Do? What to Wear?]

With high rainfall, as in August, September is another of the wettest months in Chiang Mai.

While the weather mirrors August's patterns, September stands out as one of the quietest months for tourism — there are fewer crowds and wallet-friendly prices await.

Chiang Mai's Weather and Climate in September

• Average highs: 32°C/90°F
• Average lows: 24°C/75°F
• Average precipitation: 207 mm/8.2 in
• Sunny days: 15
• Rainy days: 15

September brings high humidity and frequent rain as the monsoon season continues. Expect scattered tropical downpours, mostly in the afternoons and evenings. If a typhoon or remnant of a tropical storm rolls in, you might encounter extended rainy periods or occasional flooding. Flexibility in your plans is key to making the most of the dry spells.

As for the temperature, Chiang Mai stays warm, with daytime highs averaging about 32°C (90°F). In the mountains, however, temperatures could dip below 15°C (59°F), offering a refreshing break from the heat, even on sunny days.

Is September a Good Time to Visit Chiang Mai?

September offers a unique appeal for travelers looking to save on costs and avoid the crowds. As a low-season month, it brings the lowest prices and the quietest atmosphere, making up for the occasional rain.

However, the rainy season could pose some challenges. For instance, certain hiking trails would be closed, such as Kew Mae Pan Nature Trail, and the typically stunning views from Doi Inthanon are likely to be obscured by mist. If ideal weather and seamless outdoor exploration are your priorities, planning your trip between November and February might be a wiser choice.

What to Wear in Chiang Mai in September

Rain gear and waterproof clothing are still advisable to carry in September. Lightweight and breathable clothing is recommended for hot and humid days.

Traveling in September, pack plenty of sunscreen, a sun hat, and good sunglasses due to the high UV levels.

Insect repellent is a must, especially in the mountains or national parks.

Chiang Mai in September: 5 Rainy Season Adventures You Can't Miss!

1. Glamp with Elephants at the Best Rate and with the Most Peaceful Vibe

As the sister camp to Elephant Hills in Khao Sok, The Bush Camp Chiang Mai offers even more up-close elephant encounters. You could prepare food for the elephants, feed them multiple times, and even make paper from their dung. This all-inclusive overnight camp also provides cultural experiences, such as cooking traditional dishes with the Karen people.

In September, the camp features its best deal of the year — 20% off peak season rates. Many travelers hesitate to visit due to the potential rain, but this actually makes September the most tranquil time to experience the camp. The rainfall wouldn't spoil your trip as most activities take place under shelter, based on our on-site visit in September.

2. Step Back in Time on a Temple-Hopping Adventure

Chiang Mai is the crown jewel of Lanna temples. As part of the rainy season, the serene September allows you to have them almost to yourself.

You could see the majestic ruins at Wat Chedi Luang, marvel at the intricate details of Wat Phra Singh, and soak up the spiritual vibes during a chanting ceremony at Wat Phra That Doi Suthep. To chat or meditate with monks, don't miss Wat Suan Dok.

But don't go it alone! A savvy guide could bring these historical landmarks to life and lead you to the best spots for those Instagram-worthy photos.

3. Enjoy a Natural Escape at Doi Inthanon

If you're looking for a day in nature, Doi Inthanon is the perfect spot. Known as the "Roof of Thailand", it boasts lush jungle views, cool mountain air, and striking waterfalls.

September might bring its fair share of rain, which may blanket the summit in mist and fog, slightly limiting visibility. However, this adds to the park's Jurassic Park vibe at the summit. The waterfalls truly come into their own during this season as well. The 80-meter-high (262-foot-high) Wachirathan Waterfall is the most accessible and truly breathtaking one.

4. Bond Over Thai Cooking: a Hands-On Experience

Looking for a fun and dry activity in Chiang Mai this September? Dive into a Thai cooking class! You would avoid the rain while getting hands-on with authentic Thai cuisine together.

Centrally located, the Old City is easily accessible and home to top-notch schools. A typical class begins with a guided market tour to pick fresh ingredients, followed by crafting 5–6 delicious dishes — all topped off with tasting your creations. Schools like Zabb E Lee Thai Cooking School and Asia Scenic even offer organic farm experiences for a unique farm-to-table experience.

5. Discover the Art of Thai Craftsmanship

In September, escape the rain with a visit to the artisan villages of San Kamphaeng and Bo Sang in Chiang Mai. You would have a glimpse into traditional Thai craftsmanship.

San Kamphaeng is popular for its exquisite silk and intricate wooden designs. Don't miss the workshop renowned for its lifelike elephant sculptures—Baan Jang Nak.

If you're interested in handmade umbrellas, head to Bo Sang. Witness artisans transform mulberry bark into stunning creations, and even try painting your own umbrella for a memorable keepsake.

FAQs about Traveling to Chiang Mai in September

1. Is September an Expensive Time to Visit Chiang Mai?

Not at all. September is part of the low season so you would find discounted prices on everything from accommodation to tours.

2. Is September a Busy Time to Visit Chiang Mai?

No, it's one of the quietest months of the year. The high amount of rainfall keeps many travelers away so those willing to risk occasional short downpours every 2 days could enjoy the most peaceful atmosphere in Chiang Mai.

3. Is It Hot in Chiang Mai in September?

Yes, it's warm and humid, with highs of about 32°C (90°F). However, the mountain areas are much cooler, dropping to about 15°C (59°F).

4. Does It Rain a Lot in Chiang Mai in September?

It rains every 2 days, typically in short bursts during the afternoon or evening. You might also encounter the occasional day of prolonged rain.

5. When Is the Best Time to Visit Chiang Mai?

For ideal weather, visit between November and February, when you could enjoy the clearest skies and "cool" temperature in the low 30°C (about 86°F).

Alternatively, when visiting during off-peak months (March–May or September–October), you would benefit from the lowest prices and the fewest tourists. However, a flexible itinerary is a must to work around the hot weather (over 35°C/95°F) from March to May and rainy conditions from September to October.

Make the Most of the Weather with Asia Highlights

Travel with us and experience a trip tailored just for you. We'll craft personalized itineraries that match the weather, making every moment count. Make unforgettable memories while we handle the details.

Dreaming of Thailand? Check out our tips and ideas for the perfect getaway.

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