Dehiwala
Sri Lanka
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Dehiwala, Sri Lanka

May, the last month of the spring, in Dehiwala, is another tropical month, with average temperature fluctuating between 31°C (87.8°F) and 25°C (77°F).

Temperature

In May, the average high-temperature is almost the same as in April - a still hot 31°C (87.8°F). In May, in Dehiwala, the average low-temperature is 25°C (77°F).

Rainfall

The month with the most rainfall is May when the rain falls for 14 days and typically aggregates up to 382mm (15") of precipitation.

Sea temperature

In May, the average sea temperature in Dehiwala is 29.3°C (84.7°F). 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

The average length of the day in May is 12.4h.

Sunshine

Months with the least sunshine in Dehiwala are May through October, with an average of 6h of sunshine.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
The average daily UV index of 12 in May transform into the following instructions:
Take all necessary precautions, as unprotected skin can burn in minutes. 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. 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. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in May in Dehiwala?

The average high-temperature, in May, in Dehiwala, is 31°C (87.8°F), while the average low-temperature is 25°C (77°F).

How many days does it rain in May in Dehiwala?

In May, in Dehiwala, the rain falls for 14 days. Throughout May, 382mm (15") of precipitation is accumulated.

What is the rainiest month in Dehiwala?

May is the month with the most rainfall in Dehiwala. Rain falls for 14 days and accumulates 382mm (15") of precipitation.

What is the sea water temperature in May in Dehiwala?

In May, the average sea temperature in Dehiwala is 29.3°C (84.7°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 Dehiwala have in May?

The average length of the day in May is 12.4h.

What is the month with the least sunshine in Dehiwala?

May through October, with an average of 6h of sunshine, are months with the least sunshine in Dehiwala.

How long on average sun shines in May in Dehiwala?

In Dehiwala, Sri Lanka, the average sunshine in May is 6h.

What are the months with the highest UV index in Dehiwala?

February through October, with an average maximum UV index of 12, are months with the highest UV index in Dehiwala.

What is the UV index intensity in May in Dehiwala?

In Dehiwala, Sri Lanka, the average daily maximum UV index in May is 12. A UV Index estimate of 11, and higher, represents an extreme health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in May - Dehiwala, Sri Lanka
  • Average high temperature in May: 31°C

Warmest months (with the highest average high temperature) are March and April (32°C).
Months with the lowest average high temperature are June, July, August, September, October, November and December (30°C).

  • Average low temperature in May: 25°C

Months with the highest average low temperature are May, June, July, August and September (25°C).
Coldest months (with the lowest average low temperature) are January and December (22°C).

Average rainfall in May - Dehiwala, Sri Lanka
  • Average rainfall in May: 382mm

The wettest month (with the highest rainfall) is May (382mm).
The driest month (with the lowest rainfall) is January (55mm).

Average rainfall days in May - Dehiwala, Sri Lanka
  • Average rainfall days in May: 14 days

The month with the highest number of rainy days is October (16 days).
Months with the lowest number of rainy days are January and February (5 days).

Average sea temperature in May - Dehiwala, Sri Lanka
  • Average sea temperature in May: 29.3°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).

Average daylight in May / Average sunshine in May - Dehiwala, Sri Lanka
  • Average daylight in May: 12.4h

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

  • Average sunshine in May: 6h

Months with most sunshine are February and March (Average sunshine: 9h).
Months with least sunshine are May, June, July, August, September and October (Average sunshine: 6).

Average UV index in May - Dehiwala, Sri Lanka
  • Average UV index in May: 12

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 11).