Weather in Chiang Mai in July

A hard month. July asks something of you. Go in knowing what. You should expect rain on 25 days of the month, which is more days wet than dry.

July ranks 9 of 12 in Chiang Mai: past the worst of the year but short of December, which is the month to book if the dates are open.

Rain on 25 of the month's 31 days, 5 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 83% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 25 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest July day reached 37.3 °C and the coldest night fell to 21.5 °C, and the wettest single day dropped 86 mm — roughly 48% of the month's rain in one day.

July is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest July on record still delivered 347 mm against 110 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 178 mm average is a reasonable planning figure, not a promise.

Wind is light at 0.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 83%, high enough to notice on the warm days without dominating them.

How July sits in the year

Temperatures hold steady either side: 32.9 °C in June, 31.9 here, 30.8 in August. Nothing about the timing within the month matters much.

Daylight in July

July is at or near the longest days of Chiang Mai's year: 13.2 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

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

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

July in Chiang Mai versus nearby

If Chiang Mai is one option among several, the nearby comparison is worth making. Luang Prabang is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Udon Thani is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: July is a compromise. December is 54 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 July.