Chiang Mai Weather by Month
Chiang Mai is coolest and driest from November to February, very hot in March–April, and wetter from May to October. Haze and air quality can also matter in late winter and spring.

January is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.
February weatherDry season · Haze riskFebruary is generally dry, but haze or air-quality issues can affect outdoor comfort. Check local air-quality updates as well as weather.
March weatherHot dry seasonMarch is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.
April weatherVery hotApril typically falls in a very hot pattern. Compare temperature, rainfall and recent-year weather below before choosing your dates.
May weatherWet season beginsMay is a wetter period. Keep a rain-friendly backup plan and compare rainfall and rainy-day averages below.
June weatherWet seasonJune is a wetter period. Keep a rain-friendly backup plan and compare rainfall and rainy-day averages below.
July weatherWet seasonJuly is a wetter period. Keep a rain-friendly backup plan and compare rainfall and rainy-day averages below.
August weatherPeak wet seasonAugust is a wetter period. Keep a rain-friendly backup plan and compare rainfall and rainy-day averages below.
September weatherWet seasonSeptember is a wetter period. Keep a rain-friendly backup plan and compare rainfall and rainy-day averages below.
October weatherLate wet seasonOctober is a wetter period. Keep a rain-friendly backup plan and compare rainfall and rainy-day averages below.
November weatherCool dry seasonNovember is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.
December weatherCool dry seasonDecember is generally on the drier side, which can make outdoor plans easier. Still compare temperature and rainfall averages below.