January weather forecast
Colombo, Sri Lanka

Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake
Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake

Weather in January

January in Colombo, Sri Lanka, is a tropical winter month, with an average temperature fluctuating between 23.1°C (73.6°F) and 30.8°C (87.4°F).

Temperature

In Colombo, the average high-temperature in January is practically the same as in December - a hot 30.8°C (87.4°F). In Colombo, the average low-temperature is 23.1°C (73.6°F).

Heat index

The average heat index in January is estimated at a very hot 38°C (100.4°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. 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. 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 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

January and February, with an average relative humidity of 74%, are the least humid months in Colombo, Sri Lanka.

Rainfall

January is the month with the least rainfall in Colombo. Rain falls for 11.6 days and accumulates 40mm (1.57") of precipitation.

Sea temperature

In Colombo, Sri Lanka, in January, the average water temperature is 27.7°C (81.9°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Colombo, the average length of the day in January is 11h and 46min.
On the first day of January, sunrise is at 06:21 and sunset at 18:05. On the last day of the month, sunrise is at 06:29 and sunset at 18:18 +0530.

Sunshine

January has the most sunshine of the year, with an average of 9.1h of sunshine.

UV index

The months with the highest UV index in Colombo are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The daily maximum UV index of 7 in January interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in January in Colombo?

In Colombo, Sri Lanka, in January, the average high-temperature is 30.8°C (87.4°F), and the average low-temperature is 23.1°C (73.6°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in January is estimated at 38°C (100.4°F).

What are the least humid months in Colombo?

The months with the lowest humidity in Colombo, Sri Lanka, are January and February, with an average relative humidity of 74%.

What is the average humidity in January in Colombo?

In Colombo, the average relative humidity in January is 74%.

What is the driest month in Colombo?

January is the month with the least rainfall in Colombo, Sri Lanka. Rain falls for 11.6 days and accumulates 40mm (1.57") of precipitation.

How many days does it rain in January in Colombo?

In Colombo, Sri Lanka, in January, during 11.6 rainfall days, 40mm (1.57") of precipitation is typically accumulated.

What is the sea water temperature in January in Colombo?

In Colombo, Sri Lanka, in January, the average water temperature is 27.7°C (81.9°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Colombo have in January?

The average day length in January is 11h and 46min.

When is the sunrise / sunset in January in Colombo?

In January, on the first day of the month, sunrise is at 06:21 and sunset at 18:05. On the last day of the month, in Colombo, sunrise is at 06:29 and sunset at 18:18 +0530.

What month has the most sunshine in Colombo?

With an average of 9.1h of sunshine, January has the most sunshine of the year.

How long on average sun shines in January in Colombo?

In January, the average sunshine duration in Colombo, Sri Lanka, is 9.1h.

What is the month with the highest UV index in Colombo?

The months with the highest UV index are January through April, July, September, November and December, with an average maximum UV index of 7.

What is the UV index intensity in January in Colombo?

In Colombo, Sri Lanka, the average daily maximum UV index in January is 7. A UV Index reading of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in January
Colombo, Sri Lanka

Average temperature in January - Colombo, Sri Lanka
  • Average high temperature in January: 30.8°C

The warmest months (with the highest average high temperature) are March and April (31.8°C).
The months with the lowest average high temperature are July and August (28.9°C).

  • Average low temperature in January: 23.1°C

The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is January (23.1°C).

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Average pressure in January
Colombo, Sri Lanka

Average pressure in January - Colombo, Sri Lanka
  • Average pressure in January: 1011.6mbar

The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).

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Average wind speed in January
Colombo, Sri Lanka

Average wind speed in January - Colombo, Sri Lanka
  • Average wind speed in January: 12.8km/h

The windiest month (with the highest average wind speed) is June (15.1km/h).
The calmest month (with the lowest average wind speed) is March (8km/h).

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Average humidity in January
Colombo, Sri Lanka

Average humidity in January - Colombo, Sri Lanka
  • Average humidity in January: 74%

The months with the highest relative humidity are June, July and August (83%).
The months with the lowest relative humidity are January and February (74%).

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Average rainfall in January
Colombo, Sri Lanka

Average rainfall in January - Colombo, Sri Lanka
  • Average rainfall in January: 40mm

The wettest month (with the highest rainfall) is June (341mm).
The driest month (with the least rainfall) is January (40mm).

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Average rainfall days in January
Colombo, Sri Lanka

Average rainfall days in January - Colombo, Sri Lanka
  • Average rainfall days in January: 11.6 days

The month with the highest number of rainy days is August (30.2 days).
The month with the least rainy days is January (11.6 days).

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Average sea temperature in January
Colombo, Sri Lanka

Average sea temperature in January - Colombo, Sri Lanka
  • Average sea temperature in January: 27.7°C

The best month for swimming (with the highest average sea temperature) is April (29.6°C).
The coldest month (with the lowest average sea temperature) is August (27.2°C).

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Average daylight in January /
Average sunshine in January
Colombo, Sri Lanka

Average daylight in January / Average sunshine in January - Colombo, Sri Lanka
  • Average daylight in January: 11h and 5min

The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).

  • Average sunshine in January: 9h and 1min

The month with the most sunshine is January (Average sunshine: 9h and 6min).
The month with the least sunshine is November (Average sunshine: 6h and 42min).

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Average sunshine days in January
Colombo, Sri Lanka

Average sunshine days in January - Colombo, Sri Lanka
  • Average sunshine days in January: 17.2 days

The month with the most sunshine days is January (17.2 days).
The months with the least sunshine days are June and August (0.3 days).

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Average UV index in January
Colombo, Sri Lanka

Average UV index in January - Colombo, Sri Lanka
  • Average UV index in January: 7

The months with the highest UV index are January, February, March, April, July, September, November and December (UV index 7).
The months with the lowest UV index are May, June, August and October (UV index 6).

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Average cloud cover in January
Colombo, Sri Lanka

Average cloud cover in January - Colombo, Sri Lanka
  • Average cloud cover in January: 24

The month with the most cloud cover is June (Cloud cover 57).
The month with the least cloud cover is January (Cloud cover 24).

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Average visibility in January
Colombo, Sri Lanka

Average visibility in January - Colombo, Sri Lanka
  • Average visibility in January: 10km

The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are May, June, July, August, September, October and November (9km).

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