Dehiwala Weather in December

December in Dehiwala brings very high temperatures, with daytime highs of 31°C (88°F) and nights around 24°C (75°F). It's part of the rainy season, with 189 mm (7.4 in) of rainfall on average, so an umbrella or poncho is a good idea.

Rainfall in Dehiwala in December

As part of the rainy season, Dehiwala sees around 10 days of rain in December, with an average of 189 mm (7.4 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.

Temperature in Dehiwala in December

December in Dehiwala brings typical temperatures with highs around 31°C (88°F) and lows of 24°C (75°F). For most visitors, the main thing to prepare for is the heat during the day. Nights stay warm at around 24°C (75°F), so light bedding and good ventilation are worth thinking about.

Sunshine in Dehiwala in December

The days are predominantly sunny, with an estimated total of around 217 hours of sunshine. Rain is often only seen in the afternoon or evening, leaving clear skies for most of the day. This results in rainy months that still feel bright and are suitable for travel.

Wind Speed in Dehiwala in December

Wind speeds average 1 m/s (2 knots) during December. At this speed, you'll experience mostly light air movement that's just barely noticeable. As an average, some days will be completely calm while others have gentle breezes you can feel on your skin.

Average water temperature in December

At 27°C (81°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.

December 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.

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.

Dehiwala Temperature in December

Min Temperature 24°C (75°F)  

Max Temperature 31°C (88°F)  

Water Temperature 27°C (81°F) *  

Chance of Rain 33%  

Precipitation 189 mm (7.4 in)  

Rainy days 10 days  

Humidity 72% *  

Windspeed 1 m/s (2 knots) *  

Sunshine 217 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 December, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 23°C (73°F).

Average temperatures in December

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

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

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

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 December

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

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

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

Historical weather for Dehiwala in December

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

‹ 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 ›

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

Dehiwala historical weather extremes in December

Based on weather observations in Dehiwala between 2000 and 2025, these are the recorded extremes during December.

• The warmest day in December was on December 11, 2021, with a maximum of 34°C (93°F).
• The coldest December day was on December 20, 2014, with a maximum of 25°C (77°F).
• Dehiwala registered its coldest December night on December 30, 2019, with temperatures dropping to 13°C (55°F).

What to Wear in Dehiwala in December

Warm weather calls for comfortable, breathable clothing in December. 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. With water temperatures around 27°C (81°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Dehiwala in December

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

Swimming

8/10

Cycling

7/10

Walking

7/10

Camping

6/10

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.