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Weather Guide

Chiang Mai Weather & Climate Guide 2025

Plan your trip with detailed weather information and seasonal tips for Chiang Mai.

Chiang Mai is Thailand's cultural capital in the north, a city of ancient temples, night markets, and misty mountains. Once the heart of the Lanna Kingdom, it blends centuries of history with a thriving modern scene of cafes, art galleries, and wellness retreats.

Best Time to Visit

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Best Months

November to February

The cool dry season brings clear skies, comfortable temperatures of 15-28°C, lush post-monsoon greenery, and the city's best festivals (Loy Krathong/Yi Peng in November, Chiang Mai Flower Festival in February). Ideal for trekking, temple visits, and outdoor activities.

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Months to Avoid

February to March

The burning season (Feb-April) sees farmers burning fields and forests across northern Thailand and Myanmar, creating heavy smoke haze that can push air quality to hazardous levels. PM2.5 readings regularly exceed 200+ in March. Temperatures also rise sharply, reaching 38-40°C in April.

Climate Overview

Chiang Mai has a tropical monsoon climate with three distinct seasons: a cool dry season (November-February) with temperatures of 15-28°C, a hot season (March-May) reaching 38-40°C with severe air pollution from agricultural burning, and a monsoon rainy season (June-October) with afternoon showers but generally comfortable temperatures of 24-32°C. Altitude within the province varies from 300m in the city to 2,565m at Doi Inthanon, creating significantly cooler conditions in the mountains year-round.

Month-by-Month Guide

What to expect each month of the year.

Jan

15-28°C / 59-82°F
The coolest month with the clearest skies of the year. Evenings can be surprisingly cool. Excellent visibility for mountain views. Low tourist numbers after New Year crowds.

Feb

17-32°C / 63-90°F
Still pleasant early in the month. The Chiang Mai Flower Festival happens in the first week. Burning season begins mid-to-late February, bringing smoke haze.

Mar

21-36°C / 70-97°F
Burning season peaks with the worst air quality of the year. Hot and hazy. Only suitable for travelers who can manage poor air quality or who are visiting for specific events.

Apr

24-38°C / 75-100°F
The hottest month. Songkran water festival (mid-April) is spectacular and uniquely Chiang Mai but occurs during extreme heat. Air quality gradually improving.

May

23-35°C / 73-95°F
Transitional month with increasing rain showers that clear the air. Temperatures still high but becoming more bearable. End of high season pricing.

Jun

24-33°C / 75-91°F
Monsoon begins. Afternoon showers are refreshing and keep temperatures comfortable. Green lush landscapes. Good value accommodation.

Jul

24-32°C / 75-90°F
Consistent rainfall, primarily in afternoon and evenings. Mornings are often clear. Waterfalls at their finest. Very low tourist numbers.

Aug

24-31°C / 75-88°F
Heaviest rainfall month. Lush jungle landscapes are spectacular. Some day trips may be affected by road conditions in the mountains.

Sep

23-30°C / 73-86°F
Still rainy with occasional flooding risk. Beautiful waterfalls and greenery. October booking begins for cool season - best month to plan ahead.

Oct

22-30°C / 72-86°F
Rains diminish. Beautiful transition month with lush green landscapes and improving skies. Excellent for trekking. End of Vassa (Buddhist Lent) brings merit-making ceremonies.

Nov

17-28°C / 63-82°F
One of the best months. Loy Krathong and Yi Peng lantern festival (full moon, usually second week) is one of the world's great spectacles. Cool, clear, and beautiful.

Dec

14-27°C / 57-81°F
Excellent weather for all activities. Cool evenings, clear skies, and festive atmosphere. Peak tourist season begins. Book accommodation early.
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Seasonal Planning Guide

Complete weather data, packing lists by season, and event calendars.

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Seasonal Breakdown

Detailed information for each season.

🌸 Spring

March-May

Hot season with temperatures climbing to 35-40°C. Agricultural burning peaks in February-March, causing severe air pollution. The Songkran Water Festival (Thai New Year) in mid-April is a highlight but occurs during the hottest, smokiest period.

Tips: This is the least ideal season. If visiting, bring N95 masks for burning season, stay hydrated, avoid midday outdoor activities. Book far in advance for Songkran accommodation.

☀️ Summer

June-October

Monsoon season with daily rainfall, usually in afternoon or evening. Temperatures are comfortable at 25-32°C. Waterfalls are at their most spectacular. Some mountain trails become slippery; flooding risk increases in September-October.

Tips: Pack a light raincoat and waterproof bag. Waterfalls are beautiful. Book flexible cancellation policies for outdoor tours. Prices drop 20-40% during this season.

🍂 Fall

October-November

The transition into the cool season brings the best of both worlds - the greenery of the rains with increasingly clear skies. November hosts the stunning Loy Krathong and Yi Peng lantern festivals. Temperatures drop to 20-28°C.

Tips: Book November accommodation months in advance for Yi Peng (lantern festival). October has excellent trekking conditions with lush landscapes.

❄️ Winter

December-February

The most popular and comfortable season with clear blue skies and cool temperatures of 15-25°C. Evenings in December-January can drop to 10-12°C in the city and near freezing at altitude. Peak tourist season with festivals and events.

Tips: Pack a light jacket for evenings in December-January. Book accommodation 3-4 months in advance. The Chiang Mai Flower Festival in early February is spectacular.

What to Pack

Seasonal packing recommendations.

Year-Round Essentials

  • Modest clothing (cover shoulders and knees)
  • Comfortable walking shoes
  • Sun protection (hat, sunscreen, sunglasses)
  • Light scarf or shawl (for religious sites)
  • Reusable water bottle
  • Power adapter
  • Basic first aid kit

Hot Weather Additions

  • Lightweight, breathable fabrics
  • Extra sun protection
  • Cooling towel
  • Light colors to reflect heat
  • Sandals with back straps

Cool Weather Additions

  • Warm layers (fleece, sweater)
  • Light jacket or coat
  • Rain gear (umbrella, waterproof jacket)
  • Closed-toe shoes
  • Warm accessories (if winter)

Events & Crowd Levels

Plan around busy periods and special events.

🔴 High Season

December to February (and Songkran in April)

Higher prices, advance booking essential, crowded attractions.

🟡 Shoulder Season

October-November and May

Good balance of weather and crowds. Reasonable prices.

🟢 Low Season

June to September (monsoon)

Best deals, fewer tourists. Some services may be limited.

Major Events & Holidays

February (first weekend)
Chiang Mai Flower Festival

Three-day festival celebrating northern Thailand's flowers with elaborate floral floats, beauty pageants, and exhibitions at Nong Buak Hat Park

April 13-15
Songkran (Thai New Year)

Thailand's most famous festival - three days of citywide water fights celebrating the Buddhist New Year. Chiang Mai has the most legendary Songkran in Thailand centered on the Old City moat.

November (full moon)
Yi Peng & Loy Krathong

The lantern festival of Chiang Mai - thousands of glowing paper lanterns (khom loi) are released into the night sky simultaneously, creating one of the world's most beautiful spectacles

December-January
Winter Arts & Music Festival

Cultural performances, art exhibitions, and food events in the Old City during the cool season

Varies (October)
Vegetarian Festival (Jay Festival)

Ten-day festival where many restaurants and street stalls serve only vegan food, marked by white flags with red Chinese characters at participating vendors

Plan Your Perfect Chiang Mai Trip

Get our complete seasonal guide with detailed packing lists, event calendars, and month-by-month planning tips.

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