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

August 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 summer, August, is also a hot month in Phnom Penh, Cambodia, with average temperature ranging between max 32.5°C (90.5°F) and min 24.6°C (76.3°F).

Temperature

In Phnom Penh, the average high-temperature remains the same as in July - a still hot 32.5°C (90.5°F). The average low-temperature, in August, is 24.6°C (76.3°F).

Heat index

The average heat index in August is evaluated at a burning hot 46.7°C (116.1°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like metabolic differences, clothing, wind, and activity influence one's weather impression. 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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 August, the average relative humidity is 81%.

Rainfall

In Phnom Penh, in August, during 21.4 rainfall days, 172mm (6.8") of precipitation is typically accumulated. Throughout the year, there are 153.4 rainfall days, and 1635.6mm (64.4") of precipitation is accumulated.

Daylight

In Phnom Penh, the average length of the day is 12.5h.

Sunshine

The average sunshine in Phnom Penh, Cambodia, is 5.6h.

UV index

Months with the highest UV index in Phnom Penh are February through October, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: In August, the average maximum UV index of 12 translate into the following recommendations:
Take all required precautions, as unprotected skin and eyes can burn in minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.

What is the temperature in August in Phnom Penh?

In Phnom Penh, in August, the average high-temperature is 32.5°C (90.5°F), and the average low-temperature is 24.6°C (76.3°F). The average heat index (a.k.a. 'real feel', 'feels like'), that represents influence of the relative humidity to air temperaure, in August is evaluated at 46.7°C (116.1°F).

What is the average humidity in August in Phnom Penh?

In August, the average relative humidity is 81%.

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

In Phnom Penh, Cambodia, in August, during 21.4 rainfall days, 172mm (6.8") of precipitation is typically accumulated.

What is the average length of the day in August in Phnom Penh?

In Phnom Penh, Cambodia, the average length of the day in August is 12.5h.

How long on average sun shines in August in Phnom Penh?

In August, the average sunshine in Phnom Penh is 5.6h.

When is the highest UV index in Phnom Penh?

Months with the highest UV index are February through October, with an average maximum UV index of 12.

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

The average daily maximum UV index in August in Phnom Penh, Cambodia, is 12. A UV Index of 11, and more, symbolizes an extreme health vulnerability from unprotected exposure to the UV radiation.
Average temperature in August - Phnom Penh, Cambodia
  • Average high temperature in August: 32.5°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 August: 24.6°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 August - Phnom Penh, Cambodia
  • Average humidity in August: 81%

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 August - Phnom Penh, Cambodia
  • Average rainfall in August: 172mm

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 August - Phnom Penh, Cambodia
  • Average rainfall days in August: 21.4 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 August / Average sunshine in August - Phnom Penh, Cambodia
  • Average daylight in August: 12.5h

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 August: 5.6h

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 August - Phnom Penh, Cambodia
  • Average UV index in August: 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).