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Contents
- The climate of Dehiwala
- The best time to visit Dehiwala
- The worst time to visit Dehiwala
- Spring weather in Dehiwala
- Summer weather in Dehiwala
- Autumn weather in Dehiwala
- Winter weather in Dehiwala
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Dehiwala
The coastal town of Dehiwala, Sri Lanka, nests itself under the Köppen climate classification of Af, identifying itself prominently as a Tropical Rainforest Climate. Situated in the path of constant oceanic airflow, Dehiwala's relatively high altitude at sea level invites generous levels of humidity alongside substantial amounts of rainfall all year round.
Throughout the year, temperatures remain remarkably constant, spanning from 23.3°C (73.9°F) at their minimum to 31.4°C (88.5°F) at their maximum. This minimal fluctuation in temperatures establishes a balmy and warm climate all year round. It's interesting to note that the highest temperature peaks around April while the lowest recedes around December and January - a mild transition reflecting the local climatic patterns.
Relative humidity levels hover between 74% to 83% annually, leaning towards a rather moist climate due to its coastal vicinity. Rainfall patterns paint a dynamic picture, with the wettest months being May and June, averaging respective rainfall levels at around 312mm (12.28") and 315mm (12.4"). Precipitation generally intensifies beginning from March, with an emphasis during the mid-year months, then gradually subsides as the year ends.
The region also showcases a fairly moderate UV Index, indicating seven throughout most of the year, except in May and October where it slightly dips to six. Surprisingly, sunshine hours are fairly consistent throughout the year, varying mildly from six hours during November to nine hours during January to March.
The sea temperatures contribute to comfortable oceanic activities almost year-round, maintaining a range of 27.2°C (81°F) to 29.6°C (85.3°F). The perfect time to indulge in a swim would perhaps lie between March and May when sea temperatures reach their peak.
Throughout the year, temperatures remain remarkably constant, spanning from 23.3°C (73.9°F) at their minimum to 31.4°C (88.5°F) at their maximum. This minimal fluctuation in temperatures establishes a balmy and warm climate all year round. It's interesting to note that the highest temperature peaks around April while the lowest recedes around December and January - a mild transition reflecting the local climatic patterns.
Relative humidity levels hover between 74% to 83% annually, leaning towards a rather moist climate due to its coastal vicinity. Rainfall patterns paint a dynamic picture, with the wettest months being May and June, averaging respective rainfall levels at around 312mm (12.28") and 315mm (12.4"). Precipitation generally intensifies beginning from March, with an emphasis during the mid-year months, then gradually subsides as the year ends.
The region also showcases a fairly moderate UV Index, indicating seven throughout most of the year, except in May and October where it slightly dips to six. Surprisingly, sunshine hours are fairly consistent throughout the year, varying mildly from six hours during November to nine hours during January to March.
The sea temperatures contribute to comfortable oceanic activities almost year-round, maintaining a range of 27.2°C (81°F) to 29.6°C (85.3°F). The perfect time to indulge in a swim would perhaps lie between March and May when sea temperatures reach their peak.
The best time to visit Dehiwala
Given the constant warmth and balmy temperatures, Dehiwala can indeed be considered an all-year-round location. However, if one has to identify a prime time to visit and experience the full breadth of its tropical beauty, it would be the early part of the year - specifically from February to April. During these months, the weather in Dehiwala is most conducive to outdoor activities, boasting optimum sea temperatures alongside the benefit of nine hours of sunshine each day.
The worst time to visit Dehiwala
Despite its consistent warmth, it is advisable to avoid Dehiwala during the mid-year months of May and June. These months see the highest intensity of rainfall at 312mm (12.28") to 315mm (12.4"), leading to potentially uncomfortable outdoor conditions and restricted activity options.
Spring weather in Dehiwala
Spring in Dehiwala, falling between March to May, provides a noticeably comfortable period. Despite temperatures peaking at 31.4°C (88.5°F), the presence of nine hours of sunshine and sea temperatures averaging 29.3°C (84.7°F) lends itself to an ideal spring. However, rainfall starts increasing significantly from March, potentially impacting outdoor activities.
Summer weather in Dehiwala
Despite heavy rainfall observed during June, the season of summer shows no drastic changes in temperature. The average highest dipping slightly to 29.1°C (84.4°F) and sea temperatures reducing to around 28.2°C (82.8°F), the weather in Dehiwala remains warm and conducive for beach activities.
Autumn weather in Dehiwala
Moving into Autumn, September to November sees Dehiwala weather stabilizing from the heavily rainy period, yet maintaining all its warmth with temperature highs persisting at around 29.7°C (85.5°F). A gradual dip in rainfall is also noted, making it a relatively dry and inviting season.
Winter weather in Dehiwala
Winter in Dehiwala, from December to February, is marked by a slight decrease in temperatures with the lowest reaching 24.1°C (75.4°F) in December. Despite the term 'winter,' weather conditions remain moderately warm while rainfall also lessens, making it a comparatively dry period to enjoy. The sea temperature starts picking up from its yearly lowest, making swimming a delightful activity even during this season.
Weather in January
The start of the year in Dehiwala, Sri Lanka, boasts mild climate with comfortable temperatures. January's weather indicates a favourable blend of moderate warmth and pleasing humidity, making it an enjoyable month for locals and visitors alike. Weather in January »
Weather in February
The mild aura of Dehiwala's weather continues in February as the climate remains fairly consistent with the previous month. The city's inhabitants observe an elevation in average temperature, a subtle yet noticeable difference from January. Weather in February »
Weather in March
The onset of March in Dehiwala brings a shift in the city's climate, with temperatures and humidity escalating. With the setting of February, March distinguishes itself as a warmer, more humid month, modulating the city's environment. Weather in March »
Weather in April
April here in Dehiwala, Sri Lanka, is marked by notably high levels of rainfall, as it is one of the peak months of the year for precipitation. Regardless of the season, the city manages to sustain its charm via its moderate to high temperatures and increased daylight hours. Weather in April »
Weather in May
The arrival of May in Dehiwala manifests intensified weather conditions featuring pouring rains and soaring humidity levels. The city undergoes minor variances in climate from April, albeit with an evident increase in precipitation. Weather in May »
Weather in June
June in Dehiwala denotes abundant rainfall and high humidity whilst maintaining moderately warm temperatures. As compared to May, June witnesses only slight variations in weather with a minor dip in rainfall. Having crossed the halfway mark of the year, June features the second highest rainfall measuring 315mm (12.4"). Weather in June »
Weather in July
July enters into Dehiwala, Sri Lanka, with an overarching reduction in daily rainfall. The city's summer climate characterizes this month with moderate warmth and high humidity. Transitioning from June, July experiences a decrease in maximum rainfall and temperature, thus indicating a shift in weather dynamics. Weather in July »
Weather in August
August in Dehiwala underlines a distinct precipitation pattern while retaining the city's moderately warm temperature. The differences between July and August aren't drastic in terms of temperature, though the city witnesses a distinct climb in rainfall levels. Weather in August »
Weather in September
As September arrives in Dehiwala, a distinct decrease in daily rainfall and cooler evenings commence. The weather pattern from August carries through with minor modulations, most notably in the declined precipitation. Setting a point of interest, September records 195mm (7.68") of rainfall, an appreciable decrease from the preceding month. Weather in September »
Weather in October
October in Dehiwala sees the continuation of the rainfall pattern from September, albeit with a slight increase in both day and night temperatures. The contrast in the city's climate between September and October is subtle yet discernible with slightly warmer days. Weather in October »
Weather in November
November in Dehiwala, Sri Lanka, brings about changes in the city's climatic conditions with a reduction in rainfall and moderate warmth. The transition from October to November brings about a considerable drop in precipitation yet maintains a consistently warm environment. Weather in November »
Weather in December
December marks the end of the year in Dehiwala with a continued decrease in rain accompanied by slightly cooler temperatures both during the day and night. The close comparison between November and December's weather places them on a similar spectrum despite slight changes in conditions. Weather in December »
[Resources]Frequently asked questions
What is the least humid month in Dehiwala?
With an average relative humidity of 74%, January is the least humid month.
What is the driest month in Dehiwala?
The month with the least rainfall in Dehiwala, Sri Lanka, is January, when the rain falls for 12.7 days and typically collects 44mm (1.73") of precipitation.
How many days does it rain in Dehiwala?
In Dehiwala, Sri Lanka, during the entire year, the rain falls for 285.6 days and collects up to 2201mm (86.65") of precipitation.
What month has the most sunshine in Dehiwala?
January has the most sunshine of the year in Dehiwala, with an average of 9.2h of sunshine.
When is the highest UV index in Dehiwala?
January through April, June, July, September, November and December, with an average maximum UV index of 7, are months with the highest UV index.
What time of the year is the hottest in Dehiwala?
The month of April sees the average highest temperatures in Dehiwala, reaching 31.4°C (88.5°F) at the peak and 26.1°C (79°F) at the low.
What is the month with the warmest sea water in Dehiwala?
The month with the warmest seawater in Dehiwala, Sri Lanka, is April, with an average sea temperature of 29.6°C (85.3°F).
What is the month with the lowest UV index in Dehiwala?
May, August and October, with an average maximum UV index of 6, are months with the lowest UV index.
What are the most humid months in Dehiwala?
June through August, with an average relative humidity of 83%, are most humid months.
What is the wettest month in Dehiwala?
The month with the most rainfall is June, when the rain falls for 28.6 days and typically aggregates up to 315mm (12.4") of precipitation.
When are the longest days in Dehiwala?
June has the longest days of the year in Dehiwala, with an average of 12h and 30min of daylight.
What are the coldest months in Dehiwala?
Dehiwala, Sri Lanka, witnesses the coldest weather in August, with temperatures averaging a high of 28.7°C (83.7°F) and a low of 25.5°C (77.9°F).
What month is the sea coldest in Dehiwala?
August is the month with the coldest seawater, with an average sea temperature of 27.2°C (81°F).
What is the month with the least sunshine in Dehiwala?
November has the least sunshine of the year, with an average of 6.6h of sunshine.
What is the month with the shortest days in Dehiwala?
The month with the shortest days in Dehiwala, Sri Lanka, is December, with an average of 11h and 42min of daylight.
Is there Daylight Saving Time (DST) in Dehiwala?
Dehiwala, Sri Lanka, does not utilize Daylight Saving Time (DST). +0530 timezone is used over the entire year.
Average temperature
Dehiwala, Sri Lanka
The warmest month (with the highest average high temperature) is April (31.4°C).
The month with the lowest average high temperature is August (28.7°C).
The month with the highest average low temperature is May (26.4°C).
The coldest month (with the lowest average low temperature) is January (23.3°C).
Average pressure
Dehiwala, Sri Lanka
- Average pressure in January:
1011.6mbar - Average pressure in February:
1011.3mbar - Average pressure in March:
1010.7mbar - Average pressure in April:
1009.7mbar - Average pressure in May:
1008.6mbar - Average pressure in June:
1008.7mbar
- Average pressure in July:
1008.8mbar - Average pressure in August:
1009.1mbar - Average pressure in September:
1009.8mbar - Average pressure in October:
1010mbar - Average pressure in November:
1009.8mbar - Average pressure in December:
1010.4mbar
The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).
Average wind speed
Dehiwala, Sri Lanka
- Average wind speed in January:
13.3km/h - Average wind speed in February:
10.2km/h - Average wind speed in March:
8.1km/h - Average wind speed in April:
8.9km/h - Average wind speed in May:
13.7km/h - Average wind speed in June:
16.2km/h
- Average wind speed in July:
15.2km/h - Average wind speed in August:
15.3km/h - Average wind speed in September:
14km/h - Average wind speed in October:
10.8km/h - Average wind speed in November:
9.3km/h - Average wind speed in December:
12km/h
The windiest month (with the highest average wind speed) is June (16.2km/h).
The calmest month (with the lowest average wind speed) is March (8.1km/h).
Average humidity
Dehiwala, Sri Lanka
The months with the highest relative humidity are June, July and August (83%).
The month with the lowest relative humidity is January (74%).
Average rainfall
Dehiwala, Sri Lanka
- Average rainfall in January:
44mm - Average rainfall in February:
50mm - Average rainfall in March:
69mm - Average rainfall in April:
139mm - Average rainfall in May:
312mm - Average rainfall in June:
315mm
- Average rainfall in July:
217mm - Average rainfall in August:
252mm - Average rainfall in September:
195mm - Average rainfall in October:
245mm - Average rainfall in November:
207mm - Average rainfall in December:
156mm
The wettest month (with the highest rainfall) is June (315mm).
The driest month (with the least rainfall) is January (44mm).
Average rainfall days
Dehiwala, Sri Lanka
- Average rainfall days in January:
12.7 days - Average rainfall days in February:
14.3 days - Average rainfall days in March:
20.2 days - Average rainfall days in April:
25.8 days - Average rainfall days in May:
28.4 days - Average rainfall days in June:
28.6 days
- Average rainfall days in July:
28 days - Average rainfall days in August:
27.2 days - Average rainfall days in September:
25.4 days - Average rainfall days in October:
26.7 days - Average rainfall days in November:
25.9 days - Average rainfall days in December:
22.4 days
The month with the highest number of rainy days is June (28.6 days).
The month with the least rainy days is January (12.7 days).
Average sea temperature
Dehiwala, Sri Lanka
The best month for swimming (with the highest average sea temperature) is April (29.6°C).
The coldest month (with the lowest average sea temperature) is August (27.2°C).
Average daylight / Average sunshine
Dehiwala, Sri Lanka
- Average daylight in January:
11h and 5min - Average daylight in February:
11h and 5min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 2min - Average daylight in May:
12h and 2min - Average daylight in June:
12h and 3min
- Average daylight in July:
12h and 3min - Average daylight in August:
12h and 2min - Average daylight in September:
12h and 1min - Average daylight in October:
12h and 0min - Average daylight in November:
11h and 5min - Average daylight in December:
11h and 4min
The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).
- Average sunshine in January:
9h and 1min - Average sunshine in February:
9h and 1min - Average sunshine in March:
9h and 0min - Average sunshine in April:
9h and 0min - Average sunshine in May:
8h and 4min - Average sunshine in June:
8h and 2min
- Average sunshine in July:
7h and 5min - Average sunshine in August:
7h and 1min - Average sunshine in September:
7h and 4min - Average sunshine in October:
7h and 5min - Average sunshine in November:
6h and 4min - Average sunshine in December:
7h and 0min
The month with the most sunshine is January (Average sunshine: 9h and 12min).
The month with the least sunshine is November (Average sunshine: 6h and 36min).
Average sunshine days
Dehiwala, Sri Lanka
- Average sunshine days in January:
15.8 days - Average sunshine days in February:
11.5 days - Average sunshine days in March:
7.9 days - Average sunshine days in April:
2.2 days - Average sunshine days in May:
1.6 days - Average sunshine days in June:
0.8 days
- Average sunshine days in July:
2.1 days - Average sunshine days in August:
2.9 days - Average sunshine days in September:
2.5 days - Average sunshine days in October:
1.9 days - Average sunshine days in November:
3.2 days - Average sunshine days in December:
5.8 days
The month with the most sunshine days is January (15.8 days).
The month with the least sunshine days is June (0.8 days).
Average UV index
Dehiwala, Sri Lanka
The months with the highest UV index are January, February, March, April, June, July, September, November and December (UV index 7).
The months with the lowest UV index are May, August and October (UV index 6).
Average cloud cover
Dehiwala, Sri Lanka
The month with the most cloud cover is June (Cloud cover 55).
The month with the least cloud cover is January (Cloud cover 24).
Average visibility
Dehiwala, Sri Lanka
The months with the highest visibility are January, February, March, April, September and December (10km).
The months with the lowest visibility are May, June, July, August, October and November (9km).
Dehiwala, Sri Lanka
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