The highest day temperature in September 2026 was 88°F. The lowest night temperature was 80°F. The average values for day and night temperatures during September were 86.4°F и 82.0°F respectivly.

The average sea surface temperature in September 2026 for Kalutara was 88.5°F. The maximum and minimum values were 87.0°F and 89.6°F respectively.

Most of the days in September are gloomy but you can also expect sunny days.

Precipitation total in September for Kalutara is 15.5 in.

The average wind speed in September is 9.3 mph. It makes September one of the most windy months of the year for Kalutara.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Kalutara in September is 4.6 hours.