January weather forecast
Phnom Penh, Cambodia

January in Phnom Penh, Cambodia observes an average of 73% relative humidity with a UV index of 10, setting the stage for a generally dry and moderately sunny month. Rainfall is fairly minimal during this period with an average of just 26mm (1.02") over approximately 3 days, giving way to dry streets and clear skies. The days offer ample daylight hours with a sunshine duration of approximately 8.4 hours per day. Temperatures typically hover around the warm mark during January, however this month does see the lowest temperature of the year at 21.9°C (71.4°F). The calm and relatively mild weather makes this an ideal time to explore the city.

Temperature

The initiation of January sees an average high-temperature of a still hot 31.5°C (88.7°F), showing minor variations from the previous month. Phnom Penh cools down to an average low-temperature of 21.9°C (71.4°F) throughout the month of January.

Heat index

The heat index for January is evaluated at a blistering 40°C (104°F). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', provides an understanding of perceived warmth by combining temperature and relative humidity. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

In Phnom Penh, the average relative humidity in January is 73%.

Rainfall

In Phnom Penh, in January, during 2.8 rainfall days, 26mm (1.02") of precipitation is typically accumulated. Throughout the year, there are 153.4 rainfall days, and 1636mm (64.41") of precipitation is accumulated.

Daylight

In January, the average length of the day in Phnom Penh is 11h and 32min.
On the first day of January in Phnom Penh, sunrise is at 06:19 and sunset at 17:47. On the last day of the month, sunrise is at 06:24 and sunset at 18:02 +07.

Sunshine

In Phnom Penh, the average sunshine in January 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, Cambodia. A UV Index reading of 8 to 10 represents a very high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: A daily maximum UV index of 10 in January translates into the following instructions:
It is crucial to take precautions; skin and eyes can get damaged if left unprotected. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Enhance your sun protection with tightly woven, yet airy clothing. Apply liberally and reapply a broad-spectrum sunscreen of SPF 30+ every two hours, and promptly after any outdoor workout or a swim.