Mae Sai, in Chiang Rai, Thailand, is home to roughly 27,500 people in the Indochina time zone at 20.4°N latitude.
In 2025, Mae Sai recorded an average annual temperature of 76°F. The hottest temperatures reached 99°F in April; the coolest were 52°F in November. Total precipitation for the year was 95 inches, with the wettest month being July.
View current conditions and forecast for Mae Sai · More cities in Chiang Rai