Answer
The best time to visit Chiang Mai for pleasant weather is:
- November to February
- Cool temperatures (15-25°C)
- Minimal rainfall
- Ideal for outdoor activities and sightseeing Weather, Seasons and Air Quality can be approached by first deciding the location, time available, transport and level of activity that suits the trip. Use the options in the question as a starting point, then compare current provider information and recent local conditions before making a booking.
Practical Chiang Mai planning note: For weather and air quality, check a current forecast and a live air-quality source shortly before the activity. Northern Thailand can experience strong seasonal variation, and conditions differ between the city, foothills and higher mountains.