Unawatuna
Sri Lanka
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Unawatuna, Sri Lanka

September, the first month of the autumn, in Unawatuna, is also a moderately hot month, with average temperature ranging between max 29°C (84.2°F) and min 24°C (75.2°F).

Temperature

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

Rainfall

In Unawatuna, during September, the rain falls for 12 days and regularly aggregates up to 249mm (9.8") of precipitation. In Unawatuna, Sri Lanka, during the entire year, the rain falls for 122 days and collects up to 2503mm (98.5") of precipitation.

Sea temperature

Months with the coldest seawater in Unawatuna are January, February, June through October and December, with an average sea temperature of 28°C (82.4°F).
Note: 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.

Daylight

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

Sunshine

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

UV index

Months with the highest UV index are January through October, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an extreme health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 12 translate into the following recommendations:
Take all required precautions, as unprotected skin and eyes 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. 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. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the coldest month in Unawatuna?

The coldest months in Unawatuna are January, June through December, with an average high-temperature of 29°C (84.2°F).

What is the temperature in September in Unawatuna?

The average high-temperature, in September, in Unawatuna, Sri Lanka, is 29°C (84.2°F), while the average low-temperature is 24°C (75.2°F).

How much does it rain in Unawatuna in September?

In September, the rain falls for 12 days. Throughout September, 249mm (9.8") of precipitation is accumulated.

When is the sea coldest in Unawatuna?

Through, October and December, with an average sea temperature of 28°C (82.4°F).

How warm is the water in September in Unawatuna?

In Unawatuna, Sri Lanka, in September, the average water temperature is 28°C (82.4°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.

What is the average length of the day in September in Unawatuna?

In September, the average length of the day is 12.2h.

What is the month with the least sunshine in Unawatuna?

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

How many hours of sunshine does Unawatuna have in September?

In September, the average sunshine is 6h.

When is the highest UV index in Unawatuna?

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

What is the UV index reading in September in Unawatuna?

In September, the average daily maximum UV index in Unawatuna, Sri Lanka, is 12. A UV Index value of 11, and more, symbolizes an excessive health risk from the exposure to the Sun's UV rays.
Average temperature in September - Unawatuna, 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 January, June, July, August, September, October, November and December (29°C).

  • Average low temperature in September: 24°C

The month with the highest average low temperature is May (25°C).
Coldest months (with the lowest average low temperature) are January, February, November and December (22°C).

Average rainfall in September - Unawatuna, Sri Lanka
  • Average rainfall in September: 249mm

The wettest month (with the highest rainfall) is October (340mm).
The driest month (with the lowest rainfall) is January (94mm).

Average rainfall days in September - Unawatuna, Sri Lanka
  • Average rainfall days in September: 12 days

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

Average sea temperature in September - Unawatuna, 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 - Unawatuna, 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 and November (Average sunshine: 6).

Average UV index in September - Unawatuna, 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).