Siem Reap (Angkor) weather in April

April in Siem Reap: sweltering, a little rain — a gamble, with 41°C afternoons.

Updated September 2026 · climate normals from ERA5 reanalysis

Siem Reap🇰🇭 Cambodia · Southern Vietnam & Cambodia · City58
  1. 80Jan
  2. 77Feb
  3. 65Mar
  4. 58Apr
  5. 53May
  6. 62Jun
  7. 56Jul
  8. 60Aug
  9. 49Sep
  10. 51Oct
  11. 68Nov
  12. 78Dec

#8 of 12 months in Siem Reap · #1275 of 1413 destinations to visit in April · comfort 58/100 (tier D)

Days
35°C
Nights
25°C
Wet days
10
Sun
11 h
Humidity
67%
Daylight
12 h
Siem Reap, Cambodia
Photo: Antonio Serra · Pexels

Traveller notes on Siem Reap in April

Siem Reap-forum threads asking if April is simply too hot don't sugarcoat it - one thread calls the month stinking hot, brain-bakingly hot, everything parched, brown and dusty, with daytime temperatures well into the 40s Celsius on the worst days. Regulars offer the same standing advice: start sightseeing at first light, retreat for a long midday siesta somewhere air-conditioned with a pool, then go back out in the late afternoon once the worst heat breaks. A tuk tuk ride is recommended over an enclosed car, since the breeze dries off sweat rather than trapping heat the way air conditioning does when you step back out. Khmer New Year lands in April too, and mango season is in full swing. The midday temples empty out fast as visitors retreat indoors. The record: a scorching 35.3C by day feeling like a punishing 41C, 25.4C nights, 74mm across 10 days, 67 percent humidity, an unhealthy 77 AQI and 11 hours of sun.
AngkorAprilRegular · April · 1 month ago · Read more on Tripadvisor ↗

Other months in Siem Reap

Regulars are direct that temperatures here are essentially guaranteed to top 35C this month, though generally less humid than the peak of July, with the standard workaround being an early start, a midday retreat to a pool and air conditioning, then heading back out again late in the afternoon. Our row backs that hot, genuinely dry read, 35C reading as a scorching 40C, over 24.3C nights feeling 28C, with rain light at 36.9mm across 6.4 days and humidity at 65 percent. Regulars are consistent some visitors do manage this month and even April despite the intensity, while others avoid it deliberately, the temples themselves offering little shade regardless of timing. Sun protection and a genuinely early start remain the standard advice throughout. The record: 11 hours of sun, a 13.1 kph wind and AQI 78.
GuaranteedOver35CEarlyLateSchedule · March · 1 month ago · Read more on Tripadvisor ↗
Siem Reap-forum threads on November weather call it the downhill side of the wet season - locals treat November through January as their cold season, bundling up for the mornings until around 9:30 or 10am even though visitors mostly find it warm rather than cold. The standard itinerary follows that same schedule: Angkor tours start around 8am while it's still cool, wrapping up by midday once it gets too warm to keep walking. The monsoon is winding down but still unpredictable enough that a poncho is standard advice, with any downpour usually arriving in a concentrated morning or evening window rather than spread through the day. Posters call the November-to-mid-January stretch one of the best climate windows of the year, which is exactly why it's also peak season. The record: 31.5C days feeling like a sticky 37C, 23.6C nights, 98mm across 12.9 days, 79 percent humidity and 9.4 hours of sun.
AngkorEarlyMorningRegular · November · 1 month ago · Read more on Tripadvisor ↗
February is the last comfortable month at Angkor. It is firmly inside the dry season - our row gives 15.5mm across 2.9 days - and the mornings are still among the year's coolest, which matters when the plan is a sunrise at the temples. What regulars warn about is the dust, because months without rain leave the roads and the causeways powdery, and about the direction of travel: February is where the temperature begins its climb towards 39 or 40C by April. Tonle Sap still has enough water for the boat trips in this month, which stops being true later. It is high season, so the temples are busy. The record: 32.8C days that feel like 36C, 21.9C nights, humidity 61 percent and 10.6 hours of sun.
DustyButStillCoolMornings · February · 1 month ago · Read more on Tripadvisor ↗
December and January are the cool, settled months and the best of the Angkor year - mornings can drop to the low 20s C and the Christmas and New Year stretch is reliably clear - which is also why it is high season. The forum's crowd advice is specific and contrarian: sunrise at Angkor Wat means hundreds of people in place by 5am and is described as horrible if you dislike a crowd, while starting at about 7am puts you ahead of most of the day's traffic, and sunset is the genuinely quiet slot because everyone has gone elsewhere. Working the temple order with your driver matters more than the date. The record: 31.2C days that feel like 34C, 21.6C nights, 4.4 precipitation days, 9.6 hours of sun and AQI 38.
SevenAmNotSunrise · December · 1 month ago · Read more on Tripadvisor ↗

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Siem Reap climate normals — April

Daytime high35°C / 96°F🔥 sweltering
Nighttime low25°C / 78°F
Feels like (high)41°C / 106°F
Rainfall74 mm / 2.9 in🌦 some rain
Rainy days10 days
Humidity67%💧 humid
Dew point23°C / 74°F
Sunshine11 h/day
Daylight12.4 h
Wind13 km/h / 8 mph
Air quality (US AQI)77🙂 moderate

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Siem Reap in April

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

Peak crowdsKhmer New Year, Dry season, school holidays in 3 of the markets that fill it(estimated)

JFMAMJJASOND

Peak crowdsBusyShoulder seasonQuiet

Best months for Siem Reap's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherSiem Reap's weather peaks December–February, best around January.

JFMAMJJASOND

Best weatherFair weatherToughest weather

What's on in Siem Reap in April

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Festival

    Khmer New Year

    13–16 AprWater-festival New YearCrowdedClosures

    Siem Reap is where the country comes for it: games on the temple lawns, water and talc in the streets, and the domestic crowd filling the Angkor ticket queue for three days. Source ↗

  • Season

    Dry season

    15 Nov – 30 Apr · usuallyCrowded

    The temple roads are firm, sunrise at Angkor Wat is reliable and the town is full. From March the middle of the day at Angkor Thom is punishing and everyone is back by ten.

What's on around the world in April →

Nearby, and something's on

Within 300 km of Siem Reap — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Siem Reap?

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Siem Reap in April — FAQ

Is April a good time to visit Siem Reap?
April in Siem Reap: sweltering, a little rain — a gamble, with 41°C afternoons. It ranks #8 of 12 months for Siem Reap on SeasonMap's comfort score (58/100).
What is the weather like in Siem Reap in April?
In April, Siem Reap averages a daily high of 35.3°C and a low of 25.4°C, with about 73.7 mm of rain over roughly 10 rainy days.
What is the air quality in Siem Reap in April?
Siem Reap has a mean US Air Quality Index of about 77 in April.

Within 300 km: Phnom Penh's Khmer New Year on 13–16 Apr.