Dehiwala Weather in July

Dehiwala in July averages 30°C (86°F) during the day and 26°C (79°F) at night. July is part of the rainy season, so frequent rainfall is typical.

Rainfall in Dehiwala in July

As part of the rainy season, Dehiwala sees around 11 days of rain in July, with an average of 232 mm (9.1 in). Showers during the rainy season tend to be heavy and can come down intensely. An umbrella is often not enough, so a poncho or waterproof jacket is a better choice.

Temperature in Dehiwala in July

If you're visiting Dehiwala in July, expect highs of 30°C (86°F) and overnight lows around 26°C (79°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights are warm at 26°C (79°F). It's worth making sure your accommodation has decent ventilation or air conditioning.

Sunshine in Dehiwala in July

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 July

Average wind conditions reach 2 m/s (4 knots) in July. 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 July

At 28°C (82°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. January and February typically offer the best weather for Dehiwala.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

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 July

Min Temperature 26°C (79°F)  

Max Temperature 30°C (86°F)  

Water Temperature 28°C (82°F) *  

Chance of Rain 36%  

Precipitation 232 mm (9.1 in)  

Rainy days 11 days  

Humidity 78% *  

Windspeed 2 m/s (4 knots) *  

Sunshine 202 hours *  

Percentage Sunshine *  

* Data from: Colombo, Sri Lanka (5 KM, 3 Miles).

Daily Historical Temperatures

45-year average (1976-2025)

Based on our historical records, temperatures in Dehiwala typically stay consistent throughout July, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).

Average temperatures in July

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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 July

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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Historical weather for Dehiwala in July

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.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Dehiwala historical weather extremes in July

The extremes listed below come from historical weather data collected in Dehiwala from 1998 through 2025.

• The hottest July day on record in Dehiwala reached 39°C (102°F) (July 5, 1998).
• The coldest July day was on July 26, 2013, with a maximum of 27°C (81°F).
• Nighttime temperatures dropped to 16°C (61°F) on July 15, 2005, marking the coldest July night on record.
• The wettest day in July Dehiwala was on July 20, 2020 with 130 mm (5.1 in) of precipitation.

What to Wear in Dehiwala in July

Warm temperatures in July make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Expect water temperatures of around 28°C (82°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 July

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

8/10

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Sri Lanka, check out our Dehiwala's climate page.

More climate data for Dehiwala

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Dehiwala climate overview or explore weather in Sri Lanka.