April weather forecast and climate
Jaffna, Sri Lanka

Weather in April

April is a hot spring month in Jaffna, Sri Lanka, with average temperature varying between 28.1°C (82.6°F) and 30.4°C (86.7°F).

Temperature

The warmest month is April, with an average high-temperature of 30.4°C (86.7°F) and an average low-temperature of 28.1°C (82.6°F).

Heat index

The average heat index is appraised at a torrid 38°C (100.4°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 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like pregnancy, wind, metabolic differences, 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 particularly important for children. 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 normally cools itself by perspiration. Excessive warmth is eliminated from the body by 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 surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In April, the average relative humidity is 77%.

Rainfall

In Jaffna, during 7.5 rainfall days, 20mm (0.79") of precipitation is typically accumulated. Throughout the year, in Jaffna, Sri Lanka, there are 148.6 rainfall days, and 769mm (30.28") of precipitation is accumulated.

Sea temperature

With an average sea temperature of 30.1°C (86.2°F), April is the month with the warmest seawater.
Note: For swimming, other intense water activities, temperature above 30°C (86°F) is arguably unpleasant, as the water cooling effect is missing.

Daylight

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

Sunshine

The average sunshine in Jaffna is 10.5h.

UV index

January through October and December, with an average maximum UV index of 7, are months with the highest UV index in Jaffna. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 7 in April transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. 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. A wide-brim hat offers excellent sun protection for 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the warmest month in Jaffna?

April is the warmest month, with an average high-temperature of 30.4°C (86.7°F) and an average low-temperature of 28.1°C (82.6°F).

What is the temperature in April in Jaffna?

In April, in Jaffna, Sri Lanka, the average high-temperature is 30.4°C (86.7°F), and the average low-temperature is 28.1°C (82.6°F). In April, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is appraised at 38°C (100.4°F).

What is the average humidity in April in Jaffna?

In April, the average relative humidity in Jaffna is 77%.

How many days does it rain in April in Jaffna?

In Jaffna, in April, it is raining for 7.5 days, with typically 20mm (0.79") of accumulated precipitation.

When is the sea warmest in Jaffna?

April is the month with the warmest seawater in Jaffna, Sri Lanka, with an average sea temperature of 30.1°C (86.2°F).

How warm is the water in April in Jaffna?

In Jaffna, Sri Lanka, in April, the average water temperature is 30.1°C (86.2°F). The water temperature above 30°C (86°F) is arguably regarded as unpleasant. The primary purpose of entering the water - cooling down from sunshine and high temperatures - is lost.

How many hours of daylight does Jaffna have in April?

In Jaffna, Sri Lanka, the average length of the day in April is 12.3h.

How long on average sun shines in April in Jaffna?

In Jaffna, Sri Lanka, the average sunshine in April is 10.5h.

When is the highest UV index in Jaffna?

January through October and December, with an average maximum UV index of 7, are months with the highest UV index in Jaffna, Sri Lanka.

What is the UV index intensity in April in Jaffna?

In Jaffna, the average daily maximum UV index in April is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.

Average temperature in April
Jaffna, Sri Lanka

Average temperature in April - Jaffna, Sri Lanka
  • Average high temperature in April: 30.4°C

The warmest month (with the highest average high temperature) is April (30.4°C).
The month with the lowest average high temperature is January (26.8°C).

  • Average low temperature in April: 28.1°C

The month with the highest average low temperature is May (29°C).
The coldest month (with the lowest average low temperature) is January (25.5°C).

[Resources]

Average pressure in April
Jaffna, Sri Lanka

Average pressure in April - Jaffna, Sri Lanka
  • Average pressure in April: 1008.8mbar

The month with the highest atmospheric pressure is January (1012.5mbar).
The month with the lowest atmospheric pressure is June (1005.9mbar).

[Resources]

Average wind speed in April
Jaffna, Sri Lanka

Average wind speed in April - Jaffna, Sri Lanka
  • Average wind speed in April: 16.7km/h

The windiest month (with the highest average wind speed) is June (33.8km/h).
The calmest months (with the lowest average wind speed) are March and April (16.7km/h).

[Resources]

Average humidity in April
Jaffna, Sri Lanka

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

Months with the highest relative humidity are May, August and September (79%).
The month with the lowest relative humidity is March (75%).

[Resources]

Average rainfall in April
Jaffna, Sri Lanka

Average rainfall in April - Jaffna, Sri Lanka
  • Average rainfall in April: 20mm

The wettest month (with the highest rainfall) is October (191mm).
The driest month (with the least rainfall) is March (13mm).

[Resources]

Average rainfall days in April
Jaffna, Sri Lanka

Average rainfall days in April - Jaffna, Sri Lanka
  • Average rainfall days in April: 7.5 days

The month with the highest number of rainy days is October (22.6 days).
The month with the least rainy days is March (5.8 days).

[Resources]

Average sea temperature in April
Jaffna, Sri Lanka

Average sea temperature in April - Jaffna, Sri Lanka
  • Average sea temperature in April: 30.1°C

The best month for swimming (with the highest average sea temperature) is April (30.1°C).
The coldest month (with the lowest average sea temperature) is January (26.8°C).

[Resources]

Average daylight in April /
Average sunshine in April
Jaffna, Sri Lanka

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

The month with the longest days is June (Average daylight: 12.7h).
Months with the shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in April: 10.5h

The month with the most sunshine is June (Average sunshine: 11.6h).
The month with the least sunshine is December (Average sunshine: 5.5h).

[Resources]

Average sunshine days in April
Jaffna, Sri Lanka

Average sunshine days in April - Jaffna, Sri Lanka
  • Average sunshine days in April: 22 days

The month with the most sunshine days is March (23.9 days).
The month with the least sunshine days is November (6.3 days).

[Resources]

Average UV index in April
Jaffna, Sri Lanka

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

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

[Resources]

Average cloud cover in April
Jaffna, Sri Lanka

Average cloud cover in April - Jaffna, Sri Lanka
  • Average cloud cover in April: 19

The month with the most cloud cover is December (Cloud cover 47).
The month with the least cloud cover is March (Cloud cover 16).

[Resources]

Average visibility in April
Jaffna, Sri Lanka

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

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

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location