Phnom Penh Temperature by Month

Phnom Penh, Phnom Penh Municipality, Cambodia has a consistently very warm climate year-round, with daytime highs averaging 34°C (93°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The temperature in Phnom Penh remains steady throughout the year, providing a consistently very hot climate. Maximum daytime temperatures range from a very hot 37°C (99°F) in April to a very warm 33°C (91°F) in December. Nights are mild year-round, with lows ranging from 27°C (81°F) in April to 23°C (73°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Phnom Penh by month:

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. April, the warmest month, gets 241 hours of sunshine.

The chart below shows the average temperature throughout the year:

Phnom Penh's average annual maximum temperature is 34°C (93°F). To put that in context, here's how it compares to a few well-known destinations:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Phnom Penh, December is the coolest month, with average highs of 33°C (91°F) and humidity around 73%, considered high. In April, the warmest month, temperatures average 37°C (99°F) with 73% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Phnom Penh this rarely lasts long on the ground.

For more on Phnom Penh's weather, including monthly rainfall, sunshine hours, and humidity, visit our Phnom Penh climate page.