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

September 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 first month of the autumn, September, is still a tropical month in Phnom Penh, Cambodia, with average temperature ranging between max 32.3°C (90.1°F) and min 24.3°C (75.7°F).

Temperature

In September, the average high-temperature is relatively the same as in August - a still tropical 32.3°C (90.1°F). In September, the average low-temperature is 24.3°C (75.7°F).

Humidity

September and October, with an average relative humidity of 84%, are most humid months.

Rainfall

In September, the rain falls for 19.8 days. Throughout September, 248.8mm (9.8") of precipitation is accumulated. Throughout the year, in Phnom Penh, 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 12.2h.

Sunshine

The month with the least sunshine is September, with an average of 4.3h of sunshine.

UV index

Months with the highest UV index in Phnom Penh, Cambodia, are February through October, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme threat to health from unsafe exposure to the UV radiation for the average person.
The daily maximum UV index of 12 in September interpret into the following advice:
Take all necessary precautions, as unprotected skin can burn in minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 September in Phnom Penh?

In Phnom Penh, in September, the average high-temperature is 32.3°C (90.1°F), and the average low-temperature is 24.3°C (75.7°F).

What are the most humid months in Phnom Penh?

September and October, with an average relative humidity of 84%, are most humid months in Phnom Penh.

What is the average humidity in September in Phnom Penh?

In Phnom Penh, the average relative humidity in September is 84%.

How much does it rain in Phnom Penh in September?

In September, in Phnom Penh, Cambodia, the rain falls for 19.8 days. Throughout September, 248.8mm (9.8") of precipitation is accumulated.

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

In September, the average length of the day in Phnom Penh is 12.2h.

What is the month with the least sunshine in Phnom Penh?

The month with the least sunshine in Phnom Penh is September, with an average of 4.3h of sunshine.

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

In Phnom Penh, the average sunshine in September is 4.3h.

When is the highest UV index in Phnom Penh?

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

What is the UV index reading in September in Phnom Penh?

In September, the average daily maximum UV index in Phnom Penh, Cambodia, is 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unsafe exposure to the Sun's UV rays.
Average temperature in September - Phnom Penh, Cambodia
  • Average high temperature in September: 32.3°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 September: 24.3°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 September - Phnom Penh, Cambodia
  • Average humidity in September: 84%

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 September - Phnom Penh, Cambodia
  • Average rainfall in September: 248.8mm

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 September - Phnom Penh, Cambodia
  • Average rainfall days in September: 19.8 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 September / Average sunshine in September - Phnom Penh, Cambodia
  • Average daylight in September: 12.2h

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 September: 4.3h

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