Polonnaruwa
Sri Lanka
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Polonnaruwa, Sri Lanka

The first month of the autumn, September, is still a tropical month in Polonnaruwa, Sri Lanka, with average temperature varying between 24°C (75.2°F) and 32°C (89.6°F).

Temperature

In September, the average high-temperature remains the same as in August - a still hot 32°C (89.6°F). The average low-temperature, in September, is 24°C (75.2°F).

Rainfall

In Polonnaruwa, during September, the rain falls for 8 days and regularly aggregates up to 94mm (3.7") of precipitation. Throughout the year, there are 105 rainfall days, and 1719mm (67.7") of precipitation is accumulated.

Daylight

The average length of the day is 12.2h.

Sunshine

June, July, September through December, with an average of 6h of sunshine, are months with the least sunshine in Polonnaruwa.

UV index

Months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme threat to health from the exposure to the Sun's UV rays for the average person.
In September, the average maximum UV index of 12 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. 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. 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.

What is the temperature in September in Polonnaruwa?

In Polonnaruwa, in September, the average high-temperature is 32°C (89.6°F), and the average low-temperature is 24°C (75.2°F).

How many days does it rain in September in Polonnaruwa?

In Polonnaruwa, Sri Lanka, in September, it is raining for 8 days, with typically 94mm (3.7") of accumulated precipitation.

How many hours of daylight does Polonnaruwa have in September?

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

What is the month with the least sunshine in Polonnaruwa?

Months with the least sunshine in Polonnaruwa are June, July, September through December, with an average of 6h of sunshine.

How long on average sun shines in September in Polonnaruwa?

The average sunshine in September in Polonnaruwa is 6h.

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

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

How high is the UV index in September in Polonnaruwa?

The average daily maximum UV index in September in Polonnaruwa is 12. A UV Index of 11, and more, symbolizes an extreme health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in September - Polonnaruwa, Sri Lanka
  • Average high temperature in September: 32°C

Warmest months (with the highest average high temperature) are April, May and June (33°C).
Months with the lowest average high temperature are January and December (29°C).

  • Average low temperature in September: 24°C

Months with the highest average low temperature are April, May, June, July and August (25°C).
Coldest months (with the lowest average low temperature) are January, February, November and December (23°C).

Average rainfall in September - Polonnaruwa, Sri Lanka
  • Average rainfall in September: 94mm

The wettest month (with the highest rainfall) is December (322mm).
The driest month (with the lowest rainfall) is June (48mm).

Average rainfall days in September - Polonnaruwa, Sri Lanka
  • Average rainfall days in September: 8 days

The month with the highest number of rainy days is November (15 days).
The month with the lowest number of rainy days is February (5 days).

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

The month with the longest days is June (Average daylight: 12.6h).
Months with shortest days are January and December (Average daylight: 11.7h).

  • Average sunshine in September: 6h

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

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

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).