Dehiwala Weather in September

Thinking of visiting Dehiwala in September? Expect very high temperatures reaching 30°C (86°F) during the day, dropping to 25°C (77°F) at night. Heavy showers are common during the rainy season.

Rainfall in Dehiwala in September

As part of the rainy season, Dehiwala sees around 14 days of rain in September, with an average of 263 mm (10 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.

Temperature in Dehiwala in September

Daytime temperatures in Dehiwala reach 30°C (86°F) in September, dropping to 25°C (77°F) at night. If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.

Sunshine in Dehiwala in September

The city usually sees around 189 hours of sunlight, indicating a moderately sunny period (despite it being part of rainy season).

Wind Speed in Dehiwala in September

September sees wind speeds averaging 2 m/s (4 knots). You'll typically experience pleasant light breezes that move leaves slightly and feel refreshing. As an average, expect variation from very calm days to periods with more apparent air movement.

Average water temperature in September

The water is 28°C (82°F) this month, warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.

September in Dehiwala can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.