Siem Reap in Summer
In summer (June, July and August), Siem Reap sees average daytime highs around 33°C and overnight lows near 27°C, with 428 mm of rain over about 67 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 33°C. The sky is clear or mostly clear about 3% of the time across summer, and the air most often feels miserable.
Summer is Siem Reap's weakest season of the year to visit on our travel score. For the whole year in context, see Siem Reap's year-round climate.
- Avg daytime high
- 33°C
- 2nd-warmest season
- Avg overnight low
- 27°C
- Rainfall
- 428 mm
- 67 wet days
- Avg wind
- 10 km/h
- Travel score
- 2.5
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Siem Reap in Summer
Across summer, daytime highs hold fairly steady around 33°C.
A typical summer day in Siem Reap reaches about 33°C and drops to 27°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Siem Reap
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Siem Reap weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 31° / 23° | 9 | 1.9 | 11.3 | 5.5 |
| Feb | 33° / 24° | 13 | 2.6 | 11.6 | 4.5 |
| Mar | 34° / 26° | 52 | 7.8 | 11.9 | 3.2 |
| Apr | 35° / 27° | 94 | 13.5 | 12.3 | 2.5 |
| May | 34° / 27° | 148 | 21.4 | 12.6 | 2.2 |
| Jun | 33° / 27° | 132 | 20.7 | 12.8 | 2.4 |
| Jul | 32° / 27° | 135 | 22.1 | 12.7 | 2.6 |
| Aug | 32° / 26° | 162 | 24.4 | 12.4 | 2.4 |
| Sep | 31° / 26° | 244 | 25.9 | 12.1 | 2.5 |
| Oct | 31° / 25° | 224 | 23.3 | 11.7 | 3.1 |
| Nov | 31° / 24° | 62 | 8.8 | 11.4 | 4.7 |
| Dec | 30° / 23° | 16 | 2.9 | 11.2 | 5.7 |
Cloud cover in Summer
The sky is clear or mostly clear about 3% of the time across summer.
Chance of precipitation in Summer
Siem Reap gets around 428 mm of rain over 67 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 10 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 42 min in early June to 12 h 18 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.2 kWh/m².
Hazard calendar for Siem Reap
In summer, Siem Reap overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Siem Reap sits in the Pacific typhoon belt; the season peaks July–October.
Siem Reap's rainy season runs May–October, when most of the year's rain falls.
Is summer a good time to visit Siem Reap?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Siem Reap.
What to pack for Siem Reap in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Siem Reap sees daytime highs around 33°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 67 days see rain.
UV index in Siem Reap in Summer
Clear-sky midday UV across summer averages around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Siem Reap peaks around August 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 22 at about 8 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 10 | 10 | 12 | 12 | 11 | 12 | 13 | 14 | 12 | 11 | 8 | 8 |
| Level | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 10 | Very high |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 14 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 8 | Very high |
| Dec | 8 | Very high |
Air quality in Siem Reap in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Siem Reap is worst in February — around 40 µg/m³ PM2.5 (poor), about 2.9× the cleanest month (November, 14 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 29 | 40 | 40 | 37 | 19 | 15 | 16 | 15 | 15 | 17 | 14 | 14 |
| Level | Moderate | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 29 | Moderate |
| Feb | 40 | Poor |
| Mar | 40 | Poor |
| Apr | 37 | Poor |
| May | 19 | Moderate |
| Jun | 15 | Moderate |
| Jul | 16 | Moderate |
| Aug | 15 | Moderate |
| Sep | 15 | Moderate |
| Oct | 17 | Moderate |
| Nov | 14 | Moderate |
| Dec | 14 | Moderate |
Where is Siem Reap?
Siem Reap sits at 13.4°N, 103.9°E, 18 m above sea level, in Cambodia. The nearest listed city is Yeang, 34 km away.
Topography around Siem Reap
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Siem Reap.
Within 3 km, the terrain around Siem Reap has only modest variations in elevation — a maximum elevation change of 28 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 123 m; within 80 km, significant variations in elevation — a maximum elevation change of 484 m.
The land around Siem Reap is covered by artificial surfaces (60%) and trees (24%) within 3 km, cropland (45%) and trees (30%) within 16 km, and cropland (48%) and trees (30%) within 80 km.
Cambodia travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / C / G
- 230 V · 50 Hz
- Prices
- ≈ 34% of US
- price level, 2025
- GDP per capita
- $2,872
- 2025
- Happiness
- 4.5 / 10
- World Happiness, 2025
- Safe drinking water
- 30%
- of population, 2024
- Homicide rate
- 1.8
- per 100k, 2011
- Road deaths
- 19.6
- per 100k/yr, 2019
- Income group
- Lower middle
- World Bank
- English
- Very low
- EF EPI 390
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Siem Reap (13.3618°, 103.8606°, elevation 18 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.