Phnom Penh
Cambodia
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Phnom Penh, Cambodia

The buildings in the Royal Palace-yard in Phnom Penh, Cambodia
The buildings in the Royal Palace-yard in Phnom Penh, Cambodia
The last month of the spring, May, is also a hot month in Phnom Penh, Cambodia, with average temperature ranging between min 25.3°C (77.5°F) and max 34.3°C (93.7°F).

Temperature

In Phnom Penh, the average high-temperature is essentially the same as in April - a still tropical 34.3°C (93.7°F). In Phnom Penh, the average low-temperature is 25.3°C (77.5°F).

Heat index

The average heat index is appraised at a burning hot 51.7°C (125.1°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, differences in body mass, height, and shape, pregnancy, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In May, the average relative humidity is 77%.

Rainfall

In Phnom Penh, in May, it is raining for 16.4 days, with typically 111.6mm (4.4") of accumulated precipitation. Throughout the year, in Phnom Penh, there are 153.4 rainfall days, and 1635.6mm (64.4") of precipitation is accumulated.

Daylight

The average length of the day in Phnom Penh is 12.7h.

Sunshine

In Phnom Penh, the average sunshine is 6.5h.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index in Phnom Penh. A UV Index of 11, and more, symbolizes an excessive health risk from unsafe exposure to the UV radiation for average individuals.
Note: In May, the average maximum UV index of 12 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.

What is the temperature in May in Phnom Penh?

The average high-temperature, in May, in Phnom Penh, Cambodia, is 34.3°C (93.7°F), while the average low-temperature is 25.3°C (77.5°F). In May, the average heat index (a.k.a. 'real feel', 'feels like'), that combines both air temperature and relative humidity, is evaluated at 51.7°C (125.1°F).

What is the average humidity in May in Phnom Penh?

The average relative humidity in May in Phnom Penh, Cambodia, is 77%.

How many days does it rain in May in Phnom Penh?

In May, in Phnom Penh, Cambodia, the rain falls for 16.4 days. Throughout May, 111.6mm (4.4") of precipitation is accumulated.

How many hours of daylight does Phnom Penh have in May?

The average length of the day in May in Phnom Penh, Cambodia, is 12.7h.

How many hours of sunshine does Phnom Penh have in May?

In May, the average sunshine is 6.5h.

When is the highest UV index in Phnom Penh?

February through October, with an average maximum UV index of 12, are months with the highest UV index in Phnom Penh, Cambodia.

What is the UV index intensity in May in Phnom Penh?

In May, the average daily maximum UV index is 12. A UV Index reading of 11, and higher, represents an ultimate hazard to health from the exposure to the Sun's UV radiation.
Average temperature in May - Phnom Penh, Cambodia
  • Average high temperature in May: 34.3°C

Warmest months (with the highest average high temperature) are March and April (34.9°C).
The month with the lowest average high temperature is November (29.9°C).

  • Average low temperature in May: 25.3°C

The month with the highest average low temperature is May (25.3°C).
The coldest month (with the lowest average low temperature) is December (21.7°C).

Average humidity in May - Phnom Penh, Cambodia
  • Average humidity in May: 77%

Months with the highest relative humidity are September and October (84%).
Months with the lowest relative humidity are February and March (71%).

Average rainfall in May - Phnom Penh, Cambodia
  • Average rainfall in May: 111.6mm

The wettest month (with the highest rainfall) is October (318.9mm).
The driest month (with the lowest rainfall) is February (11.5mm).

Average rainfall days in May - Phnom Penh, Cambodia
  • Average rainfall days in May: 16.4 days

The month with the highest number of rainy days is October (24 days).
The month with the lowest number of rainy days is February (2.4 days).

Average daylight in May / Average sunshine in May - Phnom Penh, Cambodia
  • Average daylight in May: 12.7h

The month with the longest days is June (Average daylight: 12.8h).
Months with shortest days are January and December (Average daylight: 11.5h).

  • Average sunshine in May: 6.5h

The month with most sunshine is March (Average sunshine: 8.6h).
The month with least sunshine is September (Average sunshine: 4.3h).

Average UV index in May - Phnom Penh, Cambodia
  • Average UV index in May: 12

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
Months with the lowest UV index are January, November and December (UV index 10).