January 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 January

January, the same as December, in Phnom Penh, Cambodia, is a hot winter month, with average temperature fluctuating between 21.9°C (71.4°F) and 31.5°C (88.7°F).

Temperature

In January, the average high-temperature is almost the same as in December - a still hot 31.5°C (88.7°F). In January, the average low-temperature is 21.9°C (71.4°F).

Heat index

In January, the average heat index is calculated to be a sweltering 40°C (104°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy 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 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, metabolic differences, differences in body mass, height, and shape), and activity. 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. 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.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity is 73%.

Rainfall

In Phnom Penh, during January, the rain falls for 2.8 days and regularly aggregates up to 25.5mm (1") of precipitation. In Phnom Penh, during the entire year, the rain falls for 153.4 days and collects up to 1635.6mm (64.39") of precipitation.

Daylight

January and December, with an average of 11.5h of daylight, are months with the shortest days.

Sunshine

In January, the average sunshine in Phnom Penh is 8.4h.

UV index

January, November and December, with an average maximum UV index of 10, are months with the lowest UV index in Phnom Penh. A UV Index of 8 to 10 symbolizes a very high health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In January, the average maximum UV index of 10 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. 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. 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. 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 January in Phnom Penh?

In January, in Phnom Penh, the average high-temperature is 31.5°C (88.7°F), and the average low-temperature is 21.9°C (71.4°F). In January, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 40°C (104°F).

What is the average humidity in January in Phnom Penh?

The average relative humidity in January in Phnom Penh is 73%.

How much does it rain in Phnom Penh in January?

In Phnom Penh, during January, the rain falls for 2.8 days and regularly aggregates up to 25.5mm (1") of precipitation.

What is the month with the shortest days in Phnom Penh?

Months with the shortest days in Phnom Penh are January and December, with an average of 11.5h of daylight.

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

In Phnom Penh, Cambodia, the average length of the day in January is 11.5h.

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

In January, the average sunshine in Phnom Penh, Cambodia, is 8.4h.

What are the months with the lowest UV index in Phnom Penh?

Months with the lowest UV index in Phnom Penh, Cambodia, are January, November and December, with an average maximum UV index of 10.

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

In January, the average daily maximum UV index in Phnom Penh, Cambodia, is 10. A UV Index of 8 to 10 symbolizes a very high hazard to health from the exposure to the Sun's UV rays.

Average temperature in January
Phnom Penh, Cambodia

Average temperature in January - Phnom Penh, Cambodia
  • Average high temperature in January: 31.5°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 January: 21.9°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 January
Phnom Penh, Cambodia

Average humidity in January - Phnom Penh, Cambodia
  • Average humidity in January: 73%

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

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Average rainfall in January
Phnom Penh, Cambodia

Average rainfall in January - Phnom Penh, Cambodia
  • Average rainfall in January: 25.5mm

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 January
Phnom Penh, Cambodia

Average rainfall days in January - Phnom Penh, Cambodia
  • Average rainfall days in January: 2.8 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 January /
Average sunshine in January
Phnom Penh, Cambodia

Average daylight in January / Average sunshine in January - Phnom Penh, Cambodia
  • Average daylight in January: 11.5h

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

  • Average sunshine in January: 8.4h

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

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Average UV index in January
Phnom Penh, Cambodia

Average UV index in January - Phnom Penh, Cambodia
  • Average UV index in January: 10

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).

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