May weather forecast
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

Weather in May

The last month of the spring, May, is another tropical month in Phnom Penh, Cambodia, with an average temperature fluctuating between 34.3°C (93.7°F) and 25.3°C (77.5°F).

Temperature

In Phnom Penh, Cambodia, the average high-temperature in May is almost the same as in April - a still hot 34.3°C (93.7°F). The average low-temperature, in Phnom Penh, is 25.3°C (77.5°F).

Heat index

The average heat index in May is estimated at a life-threatening hot 51.7°C (125.1°F). Beware: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
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 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, differences in body mass, height, and shape, clothing, and metabolic differences 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. 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.
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

The average relative humidity in May is 77%.

Rainfall

In Phnom Penh, during 16.4 rainfall days, 111.6mm (4.39") of precipitation is typically accumulated. Throughout the year, there are 153.4 rainfall days, and 1635.6mm (64.39") of precipitation is accumulated.

Daylight

In May, the average length of the day is 12h and 40min.
On the first day of the month, sunrise is at 05:41 and sunset at 18:13. On the last day of May, sunrise is at 05:35 and sunset at 18:20 +07.

Sunshine

In Phnom Penh, the average sunshine in May 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 estimate of 11, and higher, represents an extreme threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 12 in May transform into the following instructions:
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. A wide-brim hat offers excellent sun protection for the 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. 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.
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FAQ

What is the temperature in May in Phnom Penh?

In May, in Phnom Penh, Cambodia, the average high-temperature is 34.3°C (93.7°F), and the average low-temperature is 25.3°C (77.5°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, in May is estimated at 51.7°C (125.1°F).

What is the average humidity in May in Phnom Penh?

In May, the average relative humidity is 77%.

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

In Phnom Penh, Cambodia, in May, during 16.4 rainfall days, 111.6mm (4.39") of precipitation is typically accumulated.

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

In May, the average day length is 12h and 40min.

When is the sunrise / sunset in May in Phnom Penh?

In May, on the first day of the month, sunrise is at 05:41 and sunset at 18:13. On the last day of the month, in Phnom Penh, Cambodia, sunrise is at 05:35 and sunset at 18:20 +07.

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

In Phnom Penh, Cambodia, the average sunshine duration in May is 6.5h.

When is the highest UV index in Phnom Penh?

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

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

In Phnom Penh, Cambodia, the average daily maximum UV index in May is 12. A UV Index value of 11, and more, symbolizes an extreme health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average UV index

Average temperature in May
Phnom Penh, Cambodia

Average temperature in May - Phnom Penh, Cambodia
  • Average high temperature in May: 34.3°C

The 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).

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Average humidity in May
Phnom Penh, Cambodia

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

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

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Average rainfall in May
Phnom Penh, Cambodia

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 least rainfall) is February (11.5mm).

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Average rainfall days in May
Phnom Penh, Cambodia

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 least rainy days is February (2.4 days).

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Average daylight in May /
Average sunshine in May
Phnom Penh, Cambodia

Average daylight in May / Average sunshine in May - Phnom Penh, Cambodia
  • Average daylight in May: 12h and 40min

The month with the longest days is June (Average daylight: 12h and 47min).
The month with the shortest days is December (Average daylight: 11h and 28min).

  • Average sunshine in May: 6h and 30min

The month with the most sunshine is March (Average sunshine: 8h and 36min).
The month with the least sunshine is September (Average sunshine: 4h and 18min).

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Average UV index in May
Phnom Penh, Cambodia

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

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

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