September weather forecast
Mirissa, Sri Lanka

September features a cool milieu, demonstrated by a minor drop in maximal temperature. As daylight hours recede, so do the sea temperatures match that trend. The reducing UV index reflects a lower sunlight intensity, signalling a transition in weather patterns. Nonetheless, Mirissa experiences noticeably higher rainfall of 215mm (8.46") within 11 days.

Temperature

Mirissa sees its lowest temperatures during August through October and December, with an average high-temperature of 29°C (84.2°F).

Rainfall

In Mirissa, Sri Lanka, during September, the rain falls for 11 days and regularly aggregates up to 215mm (8.46") of precipitation. In Mirissa, during the entire year, the rain falls for 116 days and collects up to 2216mm (87.24") of precipitation.

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.
Note: For any water activity, temperatures between 25°C (77°F) and 29°C (84.2°F) are deemed excellent and extremely satisfying for enduring periods.

Daylight

In September, the average length of the day is 12h and 9min.
On the first day of the month, sunrise is at 06:01 and sunset at 18:14. On the last day of September, in Mirissa, sunrise is at 05:55 and sunset at 18:00 +0530.

Sunshine

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

UV index

The months with the highest UV index are January through October, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 12 in September converts into the following recommendations:
Execute all vital precautions. Preventing sun damage is of utmost importance. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Experience reduced UV exposure by about half when donning a wide-brim hat. Even under cloud cover, use sunscreen with at least an SPF 30 generously and reapply frequently post every swim or outdoor exercise. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.