Sri Lanka weather in September 2025
Sri Lanka weather in September 2025
Day
30 °C
Night
24 °C
Sea
28 °C
Precipitation
205 mm
in month
Rainy days
15 days
in month
Daylight
12 hours
average
Sunshine
6 hours
average
Humidity
80 %
Day
30 °C
Night
24 °C
Sea
28 °C
Precipitation
205 mm
in month
Rainy days
15 days
in month
Daylight
12 hours
average
Sunshine
6 hours
average
Humidity
80 %
Overview: Sri LankaSri Lanka, a tropical island nation in South Asia, is known for its pristine beaches, lush tea plantations, ancient ruins, and wildlife-rich national parks, Sri Lanka offers something for everyone. Explore the historic sites of Sigiriya and Anuradhapura, go on a safari in Yala National Park, relax on the golden shores of Bentota Beach, and indulge in flavorful local cuisine.
Travel information
Flights
to
Activities
in Sri Lanka
Weather charts for Sri Lanka
Data backed by 40 years of history
We make the most from 40 years of historical weather data to predict the best weather conditions.
Selection of world's favourite destinations
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
16 500 000 weather records
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.
Find more destinations like this
Activities in Sri Lanka
Destinations in Sri Lanka
Destinations with similar weather to Sri Lanka
Weather overview and FAQs
Weather overview
In Sri Lanka in September, the average air temperature ranges from 30 °C (85 °F) during the day to 24 °C (76 °F) at night. There are 15 days of rain on average, where the rainfall is 205 mm (8.08 in).
Are there good conditions to visit in September in Sri Lanka?
September is one of the best months to visit Sri Lanka. The daily temperatures in this month reach pleasant 30 °C (85 °F). The seawater temperature reaches ideal 28 °C (82 °F). At night, temperatures hover around a pleasant 24 °C (76 °F).
What is the temperature in Sri Lanka during the day in September?
In Sri Lanka in September, the average daily temperatures will be 30 °C (85 °F). The ideal temperature for enjoying sunbathing by the water and a good temperature for other activities. For some people, it will be too hot in the direct sunlight and the stay may not be so pleasant. Don't forget to pack flip-flops, sunscreen, and a hand fan if necessary - it may come in handy.
What is the sea temperature in September in Sri Lanka?
In September in Sri Lanka expect the sea to be warm at 28 °C (82 °F). Seems like an ideal temperature for swimming, you can stay in the sea for a long time and enjoy it as well.
How many days of precipitation on average can I expect in September in Sri Lanka?
In Sri Lanka in September, we can expect 15 days to be rainy, that is, days when precipitation exceeds 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 3.5 days of the week, or in general - 50 % days.
How heavy is the precipitation in Sri Lanka in September?
There is precipitation of 205 mm (8.08 in) in September in Sri Lanka, which means 7 mm (0.27 in) rainfall per day on average.
What is the air temperature in September in Sri Lanka at night?
The average night temperature in Sri Lanka in September is 24 °C (76 °F). A very pleasant temperature for long evening walks, fun over a drink outside, or doing sports in the morning. If possible, look for a hotel with air conditioning.
Is it hot in Sri Lanka in September?
In September in Sri Lanka, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.
How many hours of sun to expect in September in Sri Lanka?
There is an average length of sunshine of 6 hours per day in Sri Lanka in September.
Is September part of the dry season in Sri Lanka?
No, September is not a dry month in Sri Lanka, expect rain approximately 15 days in a month.
Is September part of the wet season in Sri Lanka?
No, there is no wet season in September in Sri Lanka - you can expect 15 days of rain during the month.
How windy is it in Sri Lanka in September?
In Sri Lanka in September, there will be an average wind scale of 4.
Is Sri Lanka rainier in September than in August?
Yes, in September in Sri Lanka it rains more than in August.
How long is the day (from dawn till dusk) in Sri Lanka in September?
The length of daylight in Sri Lanka in September is 12 hours.
What is the humidity in Sri Lanka in September?
Humidity in Sri Lanka in September is 80 %. This humidity is rather above average, but except for sensitive individuals, it should not be a problem.