Dehiwala Weather in August
August in Dehiwala typically sees daytime highs of 30°C (86°F) and nighttime lows of 26°C (79°F). August falls within the rainy season, so heavy rainfall is to be expected.
Rainfall in Dehiwala in August
Dehiwala is in the rainy season in August, with rain on around 10 days and an average of 213 mm (8.4 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 Dehiwala in August
Expect highs of 30°C (86°F) in Dehiwala in August, with nights dropping to around 26°C (79°F). Overall, the month follows a fairly predictable daily temperature pattern. With lows around 26°C (79°F), the nights are warm enough that a sheet is usually all you need for bedding.
Sunshine in Dehiwala in August
The month enjoys around 202 hours of sunshine. The wet weather tends to wait until afternoon or evening to arrive, leaving the first half of most days dry and sunny.
Wind Speed in Dehiwala in August
Average wind conditions reach 2 m/s (4 knots) in August. This creates comfortable weather with light winds that gently move vegetation. Keep in mind this is an average. Daily conditions range from near-calm to more noticeable wind.
Average water temperature in August
The water temperature is 26°C (79°F), which most people find very comfortable. A good month for swimming and water sports.August in Dehiwala has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sri Lanka, check out our Dehiwala's climate page.
Dehiwala Temperature in August
Min Temperature
26°C (79°F)
Max Temperature
30°C (86°F)
Water Temperature
26°C (79°F) *
Chance of Rain
33%
Precipitation
213 mm (8.4 in)
Rainy days
10 days
Humidity
77% *
Windspeed
2 m/s (4 knots) *
Sunshine
202 hours *
Percentage Sunshine
*
Daily Historical Temperatures
45-year average (1976-2025)
Based on our historical records, temperatures in Dehiwala typically stay consistent throughout August, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in August
Daily Historical Precipitation
45-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Dehiwala in August
Browse day-by-day weather records for Dehiwala spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Dehiwala historical weather extremes in August
Based on weather observations in Dehiwala between 1996 and 2025, these are the recorded extremes during August.
- On August 10, 2015, temperatures climbed to 36°C (97°F), marking the warmest August day on record.
- On August 23, 1996, Dehiwala saw its coldest August day with temperatures maxing out at 25°C (77°F).
- Nighttime temperatures dropped to 19°C (66°F) on August 23, 2019, marking the coldest August night on record.
Best Places in Sri Lanka in August
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 August →
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What to Wear in Dehiwala in August
Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. Expect water temperatures of around 26°C (79°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Dehiwala in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sri Lanka, check out our Dehiwala's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Dehiwala climate overview or explore weather in Sri Lanka.
