Weather in Chiang Mai in April

The month to avoid. April is the month most people should skip in Chiang Mai. Daytime highs average 37.3 °C and the afternoon is not negotiable — outdoor plans move to early morning or evening.

April ranks 12 of 12 — near the bottom of Chiang Mai's year. December is the month that works, and the swing between the two is 64 points, which is a different holiday rather than a slightly better one.

Rain on 10 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for heat management rather than style: shade, water, and a schedule that gives up on the middle of the day.

What the averages hide

Averages flatten a month, and this one hides a few things: 24 days of the month clear 35 °C — that is not a heatwave, it is the month. Across the twenty years measured, the hottest April day reached 43.4 °C and the coldest night fell to 16.6 °C, and the wettest single day dropped 34 mm — roughly 54% of the month's rain in one day.

April is moderately variable: 10 mm in the driest year against 167 mm in the wettest, around an average of 63 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind is light at 0.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 56%.

How April sits in the year

This is a turning point in the year — March and May sit on opposite sides of it, so the month contains the change rather than following it. Rain is the thing that moves: May brings 12 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in April

12.6 hours of daylight, gaining 0.5 hours across the month. That is between Chiang Mai's extremes of 13.3 and 11 hours, so days are long enough not to constrain the plan.

An inland climate

Despite being inland, the year stays fairly even: 20.8 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

April in Chiang Mai versus nearby

If Chiang Mai is one option among several, the nearby comparison is worth making. Luang Prabang is a better bet in April — within a degree on temperature, 1 day more rain. Udon Thani is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: April is a compromise. December is 64 points better and is what Chiang Mai is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Chiang Mai

See all twelve months in Chiang Mai, or where else to go in April.