10 Hidden gems in Asia you need to visit
Explore 10 hidden gems in Asia offering authentic experiences, from pristine beaches and remote islands to cultural treks and peaceful mountain villages.
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.
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.
Pick a month to see the average temperature, rainfall and sunshine in Dehiwala - and find the best time to visit.
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).
45-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
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.
Based on weather observations in Dehiwala between 1996 and 2026, these are the recorded extremes during 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 →
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).
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.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Dehiwala climate overview or explore weather in Sri Lanka.
Where to go in August - average daytime high across popular destinations.
Need travel inspiration? Check out our bucket list articles and be inspired.
10 Hidden gems in Asia you need to visit
Explore 10 hidden gems in Asia offering authentic experiences, from pristine beaches and remote islands to cultural treks and peaceful mountain villages.
Where to Travel in July and August: Mexico, Thailand, Indonesia or Somewhere Else?
Compare July and August weather in Mexico, Thailand, Indonesia, Zanzibar and Sri Lanka, using historical climate data for temperature, rainfall and sunshine.
Safari at Yala West National Park
The best travel time is indicated by October to December. However from December to March you have the biggest chance to see leopards and elephants with March as the best month.
From Hikkaduwa to Hiriketiya: where to stay on the South Coast of Sri Lanka
We have selected a few of our favorite places to stay for you. With beautiful gardens, welcoming hosts, great food - these should definitely be on your bucket list!