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Kalutara Weather in September
In Kalutara, September brings high daytime temperatures around 30°C (86°F), with nights cooling to 25°C (77°F). This month falls within the rainy season, so expect frequent rainfall.
Rainfall in Kalutara in September
Kalutara is in the rainy season in September, with rain on around 13 days and an average of 299 mm (12 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours, often in the late afternoon.
Temperature in Kalutara in September
Temperatures in Kalutara in September top out at 30°C (86°F) and drop to 25°C (77°F) overnight. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 25°C (77°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.
Sunshine in Kalutara in September
The area enjoys a balanced 189 hours of sunlight, ensuring it's neither too rainy nor too sunny.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February and March typically offer the best weather for Kalutara.
Kalutara Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
30°C (86°F)
Chance of Rain
44%
Precipitation
299 mm (12 in)
Rainy days
13 days
Humidity
76% *
Sunshine
189 hours *
Percentage Sunshine
*
* Data from: Colombo, Sri Lanka (36 KM, 22 Miles).
Kalutara Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Kalutara - and find the best time to visit.
Daily Historical Temperatures
46-year average (1976-2025)
Based on our historical records, temperatures in Kalutara typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
46-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Kalutara in September
Browse day-by-day weather records for Kalutara spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Kalutara historical weather extremes in September
Our historical data for Kalutara spans 1998 to 2026, revealing these weather extremes.
- On September 22, 2019, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
- The coldest September day was on September 24, 2000, with a maximum of 25°C (77°F).
- The coldest night in September in Kalutara was on September 25, 2020, with a minimum of 10°C (50°F).
Best Places in Sri Lanka in September
Find out more about the weather in Sri Lanka and which places have the best travel conditions in this month. See all of Sri Lanka in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Kalutara in September
Warm but pleasant conditions in Kalutara in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Sunglasses could come in handy during the sunnier parts of your trip.
What To Do in Kalutara in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Kalutara 3-Day Forecast
More climate data for Kalutara
Temperature Rainfall Sunshine Humidity
See the full Kalutara climate overview or explore weather in Sri Lanka.
Popular in September
Where to go in September - average daytime high across popular destinations.
Colombo
30°C (86°F) Galle29°C (84°F) Mirissa29°C (84°F) Hikkaduwa29°C (84°F) Negombo30°C (86°F) Kandy
29°C (84°F) Unawatuna29°C (84°F) Nuwara Eliya28°C (82°F) Bucket list
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