Mirissa
Sri Lanka
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Mirissa, Sri Lanka

A row of palm trees with boats under, along Tropical Beach in Mirissa, Sri Lanka, with a sneak view of water approaching the beautiful brown sandy shore
A row of palm trees with boats under, along Tropical Beach in Mirissa, Sri Lanka, with a sneak view of water approaching the beautiful brown sandy shore
September, the first month of the autumn, in Mirissa, is also a moderately hot month, with average temperature varying between 29°C (84.2°F) and 24°C (75.2°F).

Temperature

The coldest months are August through October and December, with an average high-temperature of 29°C (84.2°F).

Rainfall

In September, the rain falls for 11 days. Throughout September, 215mm (8.5") of precipitation is accumulated. Throughout the year, in Mirissa, Sri Lanka, there are 116 rainfall days, and 2216mm (87.2") of precipitation is accumulated.

Sea temperature

January, February, June through October and December, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater. 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 Mirissa, the average length of the day is 12.2h.

Sunshine

Months with the least sunshine are May through December, with an average of 6h of sunshine.

UV index

January through October, with an average maximum UV index of 12, are months with the highest UV index in Mirissa, Sri Lanka. A UV Index estimate of 11, and higher, represents an extreme threat to health from the exposure to the Sun's UV radiation for average individuals.
The average daily UV index of 12 transform into the following instructions:
Take all necessary precautions, as unprotected skin can burn in minutes. 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. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the coldest month in Mirissa?

The coldest months in Mirissa are August through October and December, with an average high-temperature of 29°C (84.2°F).

What is the temperature in September in Mirissa?

In Mirissa, in September, the average high-temperature is 29°C (84.2°F), and the average low-temperature is 24°C (75.2°F).

How much does it rain in Mirissa in September?

In Mirissa, Sri Lanka, during September, the rain falls for 11 days and regularly aggregates up to 215mm (8.5") of precipitation.

When is the sea coldest in Mirissa?

Through, October and December, with an average sea temperature of 28°C (82.4°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 water temperature in September in Mirissa?

In Mirissa, the average seawater temperature in September is 28°C (82.4°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 Mirissa have in September?

The average length of the day in September is 12.2h.

What is the month with the least sunshine in Mirissa?

May through December, with an average of 6h of sunshine, are months with the least sunshine.

How long on average sun shines in September in Mirissa?

In September, the average sunshine in Mirissa, Sri Lanka, is 6h.

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

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

How high is the UV index in September in Mirissa?

In September, the average daily maximum UV index in Mirissa is 12. A UV Index estimate of 11, and higher, represents an excessive health risk from unprotected exposure to the UV radiation.
Average temperature in September - Mirissa, Sri Lanka
  • Average high temperature in September: 29°C

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

  • Average low temperature in September: 24°C

Months with the highest average low temperature are May and June (25°C).
The coldest month (with the lowest average low temperature) is January (22°C).

Average rainfall in September - Mirissa, Sri Lanka
  • Average rainfall in September: 215mm

The wettest month (with the highest rainfall) is October (305mm).
The driest month (with the lowest rainfall) is January (89mm).

Average rainfall days in September - Mirissa, Sri Lanka
  • Average rainfall days in September: 11 days

The month with the highest number of rainy days is November (14 days).
Months with the lowest number of rainy days are January and February (5 days).

Average sea temperature in September - Mirissa, Sri Lanka
  • Average sea temperature in September: 28°C

The best month for swimming (with the highest average sea temperature) is April (30°C).
Coldest months (with the lowest average sea temperature) are January, February, June, July, August, September, October and December (28°C).

Average daylight in September / Average sunshine in September - Mirissa, Sri Lanka
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 12.5h).
Months with shortest days are January and December (Average daylight: 11.8h).

  • Average sunshine in September: 6h

Months with most sunshine are February and March (Average sunshine: 8h).
Months with least sunshine are May, June, July, August, September, October, November and December (Average sunshine: 6).

Average UV index in September - Mirissa, Sri Lanka
  • Average UV index in September: 12

Months with the highest UV index are January, February, March, April, May, June, July, August, September and October (UV index 12).
Months with the lowest UV index are November and December (UV index 11).