April weather forecast and climate
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 April

April, like March, is another tropical spring month in Colombo, Sri Lanka, with temperature in the range of an average low of 25.8°C (78.4°F) and an average high of 31.8°C (89.2°F).

Temperature

March and April, with an average high-temperature of 31.8°C (89.2°F), are the warmest months.

Heat index

The average heat index in April is calculated to be an extremely hot 42.4°C (108.3°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', 'apparent temperature', 'felt air temperature', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like metabolic differences, differences in body mass, height, and shape, wind, and activity influence one's weather impression. 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 especially crucial for babies and toddlers. 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.
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. 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

The average relative humidity in April is 77%.

Rainfall

In Colombo, during April, the rain falls for 25.4 days and regularly aggregates up to 137mm (5.39") of precipitation. Throughout the year, in Colombo, Sri Lanka, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Sea temperature

The month with the warmest seawater is April, with an average sea temperature of 29.6°C (85.3°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in Colombo is 12.3h.

Sunshine

In April, the average sunshine in Colombo is 8.9h.

UV index

Months with the highest UV index 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 threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. 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. 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. 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 warmest month in Colombo?

March and April, with an average high-temperature of 31.8°C (89.2°F), are warmest months in Colombo.

What is the temperature in April in Colombo?

In Colombo, Sri Lanka, in April, the average high-temperature is 31.8°C (89.2°F), and the average low-temperature is 25.8°C (78.4°F). In April, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 42.4°C (108.3°F).

What is the average humidity in April in Colombo?

In Colombo, Sri Lanka, the average relative humidity in April is 77%.

How many days does it rain in April in Colombo?

In April, in Colombo, Sri Lanka, the rain falls for 25.4 days. Throughout April, 137mm (5.39") of precipitation is accumulated.

What is the month with the warmest sea water in Colombo?

The month with the warmest seawater is April, with an average sea temperature of 29.6°C (85.3°F).

How warm is the water in April in Colombo?

In Colombo, the average seawater temperature in April is 29.6°C (85.3°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.

What is the average length of the day in April in Colombo?

In April, the average length of the day is 12.3h.

How long on average sun shines in April in Colombo?

The average sunshine in April in Colombo, Sri Lanka, is 8.9h.

When is the highest UV index in Colombo?

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

What is the UV index reading in April in Colombo?

The average daily maximum UV index in April is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in April
Colombo, Sri Lanka

Average temperature in April - Colombo, Sri Lanka
  • Average high temperature in April: 31.8°C

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

  • Average low temperature in April: 25.8°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 April
Colombo, Sri Lanka

Average pressure in April - Colombo, Sri Lanka
  • Average pressure in April: 1009.7mbar

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 April
Colombo, Sri Lanka

Average wind speed in April - Colombo, Sri Lanka
  • Average wind speed in April: 8.6km/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 April
Colombo, Sri Lanka

Average humidity in April - Colombo, Sri Lanka
  • Average humidity in April: 77%

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

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Average rainfall in April
Colombo, Sri Lanka

Average rainfall in April - Colombo, Sri Lanka
  • Average rainfall in April: 137mm

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 April
Colombo, Sri Lanka

Average rainfall days in April - Colombo, Sri Lanka
  • Average rainfall days in April: 25.4 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 April
Colombo, Sri Lanka

Average sea temperature in April - Colombo, Sri Lanka
  • Average sea temperature in April: 29.6°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 April /
Average sunshine in April
Colombo, Sri Lanka

Average daylight in April / Average sunshine in April - Colombo, Sri Lanka
  • Average daylight in April: 12.3h

Months with the longest days are June and July (Average daylight: 12.5h).
The month with the shortest days is December (Average daylight: 11.7h).

  • Average sunshine in April: 8.9h

The month with the most sunshine is January (Average sunshine: 9.1h).
The month with the least sunshine is November (Average sunshine: 6.7h).

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Average sunshine days in April
Colombo, Sri Lanka

Average sunshine days in April - Colombo, Sri Lanka
  • Average sunshine days in April: 2.6 days

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

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Average UV index in April
Colombo, Sri Lanka

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

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

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Average cloud cover in April
Colombo, Sri Lanka

Average cloud cover in April - Colombo, Sri Lanka
  • Average cloud cover in April: 40

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 April
Colombo, Sri Lanka

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

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

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