Jaffna
Sri Lanka
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Jaffna, Sri Lanka

September, the first month of the autumn, in Jaffna, is still a tropical month, with average temperature fluctuating between 25°C (77°F) and 32°C (89.6°F).

Temperature

In September, the average high-temperature is practically the same as in August - a still hot 32°C (89.6°F). In Jaffna, in September, the average low-temperature is 25°C (77°F).

Rainfall

In Jaffna, during September, the rain falls for 4 days and regularly aggregates up to 60mm (2.4") of precipitation. In Jaffna, Sri Lanka, during the entire year, the rain falls for 57 days and collects up to 1200mm (47.2") of precipitation.

Sea temperature

In Jaffna, the average seawater temperature is 29°C (84.2°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.

Daylight

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

Sunshine

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 in Jaffna. A UV Index value of 11, and more, symbolizes an excessive health risk from unsafe exposure to the UV radiation for the average person.
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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in September in Jaffna?

The average high-temperature, in September, in Jaffna, Sri Lanka, is 32°C (89.6°F), while the average low-temperature is 25°C (77°F).

How much does it rain in Jaffna in September?

In Jaffna, in September, during 4 rainfall days, 60mm (2.4") of precipitation is typically accumulated.

What is the water temperature in September in Jaffna?

In Jaffna, the average seawater temperature in September is 29°C (84.2°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 Jaffna?

In September, the average length of the day in Jaffna, Sri Lanka, is 12.2h.

How many hours of sunshine does Jaffna have in September?

In Jaffna, the average sunshine in September is 7h.

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

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

What is the UV index reading in September in Jaffna?

In September, the average daily maximum UV index in Jaffna, Sri Lanka, is 12. A UV Index reading of 11, and higher, represents an extreme health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Jaffna, Sri Lanka
  • Average high temperature in September: 32°C

The warmest month (with the highest average high temperature) is May (34°C).
Months with the lowest average high temperature are January and December (28°C).

  • Average low temperature in September: 25°C

The month with the highest average low temperature is April (27°C).
The coldest month (with the lowest average low temperature) is January (23°C).

Average rainfall in September - Jaffna, Sri Lanka
  • Average rainfall in September: 60mm

The wettest month (with the highest rainfall) is November (380mm).
The driest month (with the lowest rainfall) is June (10mm).

Average rainfall days in September - Jaffna, Sri Lanka
  • Average rainfall days in September: 4 days

The month with the highest number of rainy days is November (12 days).
The month with the lowest number of rainy days is June (1 days).

Average sea temperature in September - Jaffna, Sri Lanka
  • Average sea temperature in September: 29°C

The best month for swimming (with the highest average sea temperature) is April (30.1°C).
The coldest month (with the lowest average sea temperature) is January (26.8°C).

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

The month with the longest days is June (Average daylight: 12.7h).
Months with shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in September: 7h

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

Average UV index in September - Jaffna, 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).
Months with the lowest UV index are November and December (UV index 10).