Phnom Penh in Summer
In summer (June, July and August), Phnom Penh sees average daytime highs around 33°C and overnight lows near 26°C, with 486 mm of rain over about 76 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 2% of the time across summer, and the air most often feels miserable.
Summer is Phnom Penh's weakest season of the year to visit on our travel score. For the whole year in context, see Phnom Penh's year-round climate.
- Avg daytime high
- 33°C
- 2nd-warmest season
- Avg overnight low
- 26°C
- Rainfall
- 486 mm
- 76 wet days
- Avg wind
- 10 km/h
- Travel score
- 2.1
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Phnom Penh in Summer
Across summer, daytime highs hold fairly steady around 33°C.
A typical summer day in Phnom Penh reaches about 33°C and drops to 26°C overnight. The warmest of the three months is June, the coolest July.
How summer really feels in Phnom Penh
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.
Phnom Penh 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 | 32° / 23° | 15 | 3 | 11.4 | 4.5 |
| Feb | 34° / 24° | 8 | 1.7 | 11.6 | 3.8 |
| Mar | 35° / 26° | 36 | 6.2 | 11.9 | 2.7 |
| Apr | 36° / 27° | 81 | 14.6 | 12.2 | 1.9 |
| May | 35° / 27° | 154 | 22.7 | 12.5 | 1.8 |
| Jun | 34° / 26° | 154 | 24.3 | 12.7 | 2.0 |
| Jul | 33° / 26° | 154 | 25.6 | 12.6 | 2.2 |
| Aug | 33° / 26° | 178 | 25.9 | 12.4 | 2.1 |
| Sep | 32° / 26° | 245 | 27.2 | 12.1 | 2.1 |
| Oct | 32° / 25° | 244 | 24.7 | 11.7 | 2.6 |
| Nov | 32° / 25° | 78 | 11.1 | 11.5 | 3.9 |
| Dec | 31° / 24° | 27 | 5.1 | 11.3 | 4.7 |
Cloud cover in Summer
The sky is clear or mostly clear about 2% of the time across summer.
Chance of precipitation in Summer
Phnom Penh gets around 486 mm of rain over 76 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 36 min in early June to 12 h 12 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 5.1 kWh/m².
Hazard calendar for Phnom Penh
In summer, Phnom Penh overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Phnom Penh sits in the Pacific typhoon belt; the season peaks July–October.
Phnom Penh's rainy season runs May–October, when most of the year's rain falls.
Is summer a good time to visit Phnom Penh?
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 Phnom Penh.
What to pack for Phnom Penh in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Phnom Penh sees daytime highs around 33°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 76 days see rain.
UV index in Phnom Penh 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 Phnom Penh peaks around August 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 19 at about 9 (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 | 11 | 12 | 12 | 11 | 12 | 12 | 14 | 13 | 10 | 9 | 9 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Extreme |
| Feb | 11 | Extreme |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 14 | Extreme |
| Sep | 13 | Extreme |
| Oct | 10 | Very high |
| Nov | 9 | Very high |
| Dec | 9 | Very high |
Air quality in Phnom Penh 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 Phnom Penh is worst in February — around 44 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (August, 18 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) | 42 | 44 | 41 | 35 | 26 | 21 | 21 | 18 | 22 | 28 | 29 | 29 |
| Level | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 42 | Poor |
| Feb | 44 | Poor |
| Mar | 41 | Poor |
| Apr | 35 | Poor |
| May | 26 | Moderate |
| Jun | 21 | Moderate |
| Jul | 21 | Moderate |
| Aug | 18 | Moderate |
| Sep | 22 | Moderate |
| Oct | 28 | Moderate |
| Nov | 29 | Moderate |
| Dec | 29 | Moderate |
Where is Phnom Penh?
Phnom Penh sits at 11.6°N, 104.9°E, 20 m above sea level, in Cambodia. The nearest listed city is Boeng Kak Pir, 3.0 km away.
Topography around Phnom Penh
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Phnom Penh.
Within 3 km, the terrain around Phnom Penh has only modest variations in elevation — a maximum elevation change of 25 m around an average of 13 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 59 m; within 80 km, large variations in elevation — a maximum elevation change of 713 m.
The land around Phnom Penh is covered by artificial surfaces (82%) within 3 km, artificial surfaces (25%) within 16 km, and cropland (70%) 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 Phnom Penh (11.5625°, 104.916°, elevation 20 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.