Thailand · 18.79°N 98.98°E · 30-year monthly averages, judged against the Tropical preset (highs 28–38 °C82–100 °F, any rain except monsoon)
The best time to visit Chiang Mai is February to July and October to November, with highs of 28–34 °C82–93 °F and nights of 14–22 °C57–72 °F, and rainfall of 8–160 mm0.3–6.3 in a month.
The rainy season is May to October; August to September is a true monsoon, with 184–208 mm7.2–8.2 in a month and a peak in August (208 mm8.2 in). April is the hottest month (highs of 34 °C93 °F) and December the coldest (26 °C79 °F).
The figures are 30-year monthly averages (WorldClim 2.1 monthly normals 1970–2000) for the 0.25° grid cell at 18.79, 98.98. This is a climate guide, not a forecast.
Pick the weather you like. Every month is then judged against it: temperature above the month names, rain below.
Good time to go for a Tropical holiday: February to July and October to November.
Open Chiang Mai on the interactive map ↗ the same verdicts for any place on Earth, in any month
Reading the chart. Gold means good: the month fits what you picked. Any other colour shows the reason it does not. The temperature bar can be too cold or too hot; the rain bar can be too dry, too rainy or monsoon. A faded gold bar means that half fits but the other half does not. A gold month name means both halves fit.
What the verdicts mean. Temperature is the month's average daily high (the afternoon), judged against the preset's band (highs 28–38 °C82–100 °F for Tropical). Rain is judged by each month's class within Chiang Mai's own year, not by raw millimetres: dry under 60 mm2.4 in, showers 60–100 mm2.4–3.9 in, rainy from 100 mm3.9 in and at least 35 % of the wettest month. Too rainy is a rainy-season month that the preset does not allow. Monsoon is the heaviest kind of rainy season: 180 mm7.1 in or more (120 mm4.7 in near the yearly peak) in a climate where the wettest month has at least three times the rain of the driest. Every monsoon month is also a rainy-season month; the label says which kind. Full rules on the method page.
| Month | Rain | High | Low | Season | Tropical verdict |
|---|---|---|---|---|---|
| January | 00 | 2781 | 1254 | dry | too cold |
| February | 80.3 | 3086 | 1456 | dry | good |
| March | 240.9 | 3391 | 1763 | dry | good |
| April | 562.2 | 3493 | 2169 | dry | good |
| May | 1606.3 | 3290 | 2271 | rainy | good |
| June | 1204.7 | 3086 | 2272 | rainy | good |
| July | 1606.3 | 3085 | 2272 | rainy | good |
| August | 2088.2 | 2984 | 2271 | monsoon | monsoon |
| September | 1847.2 | 2984 | 2170 | monsoon | monsoon |
| October | 1044.1 | 2983 | 2068 | rainy | good |
| November | 401.6 | 2882 | 1763 | dry | good |
| December | 80.3 | 2679 | 1355 | dry | too cold |
| Looking for | Rule | Months that fit |
|---|---|---|
| Warm | highs 19–28 °C66–82 °F, dry or showers | December to January |
| Tropical | highs 28–38 °C82–100 °F, any rain except monsoon | February to July and October to November |
| Beach | highs 28–38 °C82–100 °F, dry or showers | February to April and November |
| Cool | highs 3–19 °C37–66 °F, any rain except monsoon | |
| Snow | highs below 3 °C37 °F, any rain |
Yes. The rainy season is May to October; August to September is a true monsoon, with 184–208 mm7.2–8.2 in a month and a peak in August (208 mm8.2 in). Outside the rainy season, November to April is dry.
April is the hottest month (highs of 34 °C93 °F) and December the coldest (26 °C79 °F). Annual rainfall is about 1,072 mm42 in.
The nearest destinations that fit the Tropical preset in the months when Chiang Mai does not:
The interactive map colours the whole world by how well it fits the weather you like, in any month, and shows this chart for any place you tap.