Negombo
Sri Lanka
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Negombo, Sri Lanka

The last month of the spring, May, is also a hot month in Negombo, Sri Lanka, with average temperature ranging between min 26°C (78.8°F) and max 31°C (87.8°F).

Temperature

February through May, with an average high-temperature of 31°C (87.8°F), are the warmest months.

Rainfall

May is the month with the most rainfall in Negombo. Rain falls for 12 days and accumulates 371mm (14.6") of precipitation.

Sea temperature

In Negombo, Sri Lanka, the average water temperature is 29.3°C (84.7°F). 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

Months with the longest days are May through July, with an average of 12.5h of daylight.

Sunshine

In Negombo, the average sunshine is 7h.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an extreme health hazard from unprotected exposure to the Sun's UV rays for average individuals.
In May, the average maximum UV index of 12 translate into the following recommendations:
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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the warmest month in Negombo?

Warmest months in Negombo, Sri Lanka, are February through May, with an average high-temperature of 31°C (87.8°F).

What is the temperature in May in Negombo?

The average high-temperature, in May, in Negombo, is 31°C (87.8°F), while the average low-temperature is 26°C (78.8°F).

How many days does it rain in May in Negombo?

In Negombo, Sri Lanka, in May, it is raining for 12 days, with typically 371mm (14.6") of accumulated precipitation.

What is the rainiest month in Negombo?

May is the month with the most rainfall in Negombo. Rain falls for 12 days and accumulates 371mm (14.6") of precipitation.

What is the sea water temperature in May in Negombo?

In Negombo, the average seawater temperature in May 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.

When are the longest days in Negombo?

Months with the longest days in Negombo are May through July, with an average of 12.5h of daylight.

What is the average length of the day in May in Negombo?

In May, the average length of the day in Negombo is 12.5h.

How long on average sun shines in May in Negombo?

In Negombo, Sri Lanka, the average sunshine in May is 7h.

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

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

How high is the UV index in May in Negombo?

In Negombo, Sri Lanka, the average daily maximum UV index in May is 12. A UV Index value of 11, and more, symbolizes an extreme health threat from the exposure to the Sun's UV radiation.
Average temperature in May - Negombo, Sri Lanka
  • Average high temperature in May: 31°C

Warmest months (with the highest average high temperature) are February, March, April and May (31°C).
Months with the lowest average high temperature are June, July, August, September, October, November and December (29°C).

  • Average low temperature in May: 26°C

The month with the highest average low temperature is May (26°C).
Coldest months (with the lowest average low temperature) are January, February and December (22°C).

Average rainfall in May - Negombo, Sri Lanka
  • Average rainfall in May: 371mm

The wettest month (with the highest rainfall) is May (371mm).
The driest month (with the lowest rainfall) is February (69mm).

Average rainfall days in May - Negombo, Sri Lanka
  • Average rainfall days in May: 12 days

Months with the highest number of rainy days are October and November (15 days).
Months with the lowest number of rainy days are January and February (4 days).

Average sea temperature in May - Negombo, Sri Lanka
  • Average sea temperature in May: 29.3°C

The best month for swimming (with the highest average sea temperature) is April (29.7°C).
The coldest month (with the lowest average sea temperature) is August (27°C).

Average daylight in May / Average sunshine in May - Negombo, Sri Lanka
  • Average daylight in May: 12.5h

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

  • Average sunshine in May: 7h

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

Average UV index in May - Negombo, 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).