Weather in Siem Reap in June

A hard month. June asks something of you. Go in knowing what. You should expect rain on 23 days of the month, which is more days wet than dry.

June ranks 10 of 12 — near the bottom of Siem Reap's year. December is the month that works, and the swing between the two is 39 points, which is a different holiday rather than a slightly better one.

Rain on 23 of the month's 30 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 82% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 27 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest June day reached 39.6 °C and the coldest night fell to 22.8 °C, and the wettest single day dropped 66 mm — roughly 39% of the month's rain in one day.

June is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest June on record still delivered 303 mm against 66 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 168 mm average is a reasonable planning figure, not a promise.

Wind is light at 6.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How June sits in the year

Temperatures hold steady either side: 34.1 °C in May, 32 here, 30.9 in July. Nothing about the timing within the month matters much.

Daylight in June

Siem Reap sits close enough to the equator that daylight barely moves all year — 12.9 hours in June, against a range of just 1.6 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 16.1 °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.

June in Siem Reap versus nearby

If Siem Reap is one option among several, the nearby comparison is worth making. Ubon Ratchathani is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Nakhon Ratchasima is close enough to be a coin toss — within a degree on temperature, 3 days less rain.

So: June is a compromise. December is 31 points better and is what Siem Reap 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 Siem Reap

See all twelve months in Siem Reap, or where else to go in June.