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Contents
- The climate of Kalutara
- The best time to visit Kalutara
- The worst time to visit Kalutara
- Spring weather in Kalutara
- Summer weather in Kalutara
- Autumn weather in Kalutara
- Winter weather in Kalutara
- 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 Kalutara
Durably seated within a Köppen climate classification of 'Af,' Kalutara is enveloped by a tropical rainforest climate. This sprawling city nestles on the west coast of Sri Lanka, frequently graced with uniform temperatures and high humidity conditions all year round. The moderating influence of the Indian Ocean upon Kalutara's position is deemed responsible for its idyllic weather.
Examining the climatic metrics, it becomes evident that Kalutara experiences little variation in both high and low temperatures throughout the year. High temperatures fluctuate modestly within a narrow range, from 28.6°C (83.5°F) to 31.3°C (88.3°F). Correspondingly, nighttime temperatures are observed to fall from 26.3°C (79.3°F) to slightly lower degrees around 23.4°C (74.1°F), justifying the much sought-after reputation of the city's warmly inviting, equatorial climate.
Humidity in this tropical enclave oscillates between 75% and 83%, promoting an environment for lush vegetation to thrive under these conditions. Bolstering this verdant paradise image is the substantial rainfall, which Kalutara receives in abundance almost throughout the year. Noticeably, the city encounters its highest rainfall of 350mm (13.78") in June, whereas the lowest, lying at 25mm (0.98"), is recorded in January.
Distinctly unusual for Kalutara is the waning of its wind speeds as the year advances, descending from 13.2km/h (8.2mph) in January to 7.9km/h (4.9mph) by March before embarking on an incline. Coupled with equable sea temperatures varying from 27.2°C (81°F) to 29.6°C (85.3°F), the plentiful sunshine - albeit diminished between May and August due to a concurrent influx of cloud cover - all together contribute to the intricate tapestry of Kalutara's climate.
Examining the climatic metrics, it becomes evident that Kalutara experiences little variation in both high and low temperatures throughout the year. High temperatures fluctuate modestly within a narrow range, from 28.6°C (83.5°F) to 31.3°C (88.3°F). Correspondingly, nighttime temperatures are observed to fall from 26.3°C (79.3°F) to slightly lower degrees around 23.4°C (74.1°F), justifying the much sought-after reputation of the city's warmly inviting, equatorial climate.
Humidity in this tropical enclave oscillates between 75% and 83%, promoting an environment for lush vegetation to thrive under these conditions. Bolstering this verdant paradise image is the substantial rainfall, which Kalutara receives in abundance almost throughout the year. Noticeably, the city encounters its highest rainfall of 350mm (13.78") in June, whereas the lowest, lying at 25mm (0.98"), is recorded in January.
Distinctly unusual for Kalutara is the waning of its wind speeds as the year advances, descending from 13.2km/h (8.2mph) in January to 7.9km/h (4.9mph) by March before embarking on an incline. Coupled with equable sea temperatures varying from 27.2°C (81°F) to 29.6°C (85.3°F), the plentiful sunshine - albeit diminished between May and August due to a concurrent influx of cloud cover - all together contribute to the intricate tapestry of Kalutara's climate.
The best time to visit Kalutara
The optimal timeframe for a visit to Kalutara hinges on the traveler's preference for drier weather conditions and the pursuit of outdoor activities. By virtue of the city's precipitation pattern, the period extending from January to March can be designated as the most favorable for travel. During this phase, rainfall drops to its minimum, registering between 25mm (0.98") and 61mm (2.4"), while sunshine hours remain admirable at 9.2 hours per day in January, just slightly reducing to 9 hours daily by March.
The worst time to visit Kalutara
Conversely, the most challenging period to explore Kalutara falls between May and August. Despite daytime temperatures remaining within a comfortable range, the significantly escalated rain levels combined with the dip in sunshine hours may dampen the allure of this tropical haven. June, in particular, witnesses the heaviest downpour amounting to an impressive 350mm (13.78") while sunshine hours languish at their lowest at 7.8 hours per day.
Spring weather in Kalutara
March through May signifies the advent of spring in Kalutara. During these months, visitors will experience gradually escalating temperatures from 30.3°C (86.5°F) to 30.2°C (86.4°F), and correspondingly, with a slight uptick in night-time temperatures from 25°C (77°F) to a peak of 26.3°C (79.3°F) in May. Humidity ascends to clamp between 77% and 81%, and as June beckons, the surge in rainfall from 61mm (2.4") to 303mm (11.93") can be noted.
Summer weather in Kalutara
June marks the initiation of summer that lasts until August in Kalutara. This period bears witness to a minor downtrend in maximum temperatures from 29.2°C (84.6°F) to 28.6°C (83.5°F). Concomitant with the calmer winds, the city undergoes its highest downpour of 350mm (13.78") in June, eased eventually by a trifle to 282mm (11.1") by August. The precise blend of moist, warm air and abundant rainfall fosters a bona fide rainforest ambiance in this Sri Lankan retreat.
Autumn weather in Kalutara
During the autumn months of September through November, Kalutara's climate moderates to offer high temperature readings close to the annual mean temperature. As the season unfolds, wind speeds are perceptibly reduced, rainfall levels decline progressively from 201mm (7.91") to 133mm (5.24"), and sunshine duration sees a revival from 7.6 hours per day in September, up slightly to 6.8 hours daily by November.
Winter weather in Kalutara
The winter season envelops Kalutara between December and February, marking the onset of relatively drier months. High temperatures seem to hover in a stable range of 29.7°C (85.5°F) to 30.9°C (87.6°F) with bountiful sunshine hours reaching upwards to 9.2 hours per day in December. The dip in rainfall levels to 93mm (3.66") and 25mm (0.98") in December and January respectively renders this a rejuvenating and enticingly pleasant season in Kalutara.
Weather in January
Kalutara experiences a tropical climate consistent with the rest of Sri Lanka in January. Warm temperatures ranging from 23.4°C (74.1°F) to 30.3°C (86.5°F) give way to an excellent beach weather. Sitting above the equator, Kalutara enjoys longer daylight hours approximated at 11.8 hours and a relative humidity of 75%. Weather in January »
Weather in February
Kalutara enters February with a gradual increase in temperatures, accompanied by an uptick in humidity and rainfall. Expected temperatures elevate, with an average high of 30.9°C (87.6°F). As a region rich in coastal lowlands, the relative humidity is on the higher side, standing at 75%. Weather in February »
Weather in March
This mid-season month of March comes with subtle weather variations. Compared to February, the region observes an increase in temperature, introducing warmer days. The maximum temperature reaches an average of 31.3°C (88.3°F), making the region hotter. Weather in March »
Weather in April
As we venture into April, there is a visible increasing trend in rainfall. The heat remains on a steady climb, with the highest temperature in April also topping at 31.3°C (88.3°F). This fluctuation leads to increased humidity, making the overall weather feel warmer than it is. Weather in April »
Weather in May
In May, Kalutara transitions into the monsoon season, marked by an upsurge in humidity and rainfall. This month records the highest rainfall of 303mm (11.93"), indicating the peak of the rainy season. Despite the high levels of precipitation, the temperatures remain relatively constant and warm. Weather in May »
Weather in June
June is a unique month in Kalutara weather calendar due to its continual high rainfall comparable to May's magnitude which aggregates to 350mm (13.78"). Temperature and humidity maintain their levels, still providing a very warm climate. Weather in June »
Weather in July
Julys' weather in Kalutara calms down a bit from June's monsoon peak with reduction in heavy rainfall and more sunshine hours. Temperatures, however, remain consistent with the maximum temperature reaching 28.7°C (83.7°F). The climatic changes experienced in July pave the way for a decent sunny yet tropical weather, making it a favorable period for visitors. Weather in July »
Weather in August
August in Kalutara emulates July's weather pattern as both months share close climatic characteristics. The temperatures hover around a maximum of 28.6°C (83.5°F), mirroring July’s warmth. The ebbing monsoon means a decline in the number of rainfall days. Weather in August »
Weather in September
September arrives with marginal changes in temperature and an appreciable dip in rainfall. The highest temperature recorded is 28.8°C (83.8°F). As Kalutara slowly escapes the monsoon season, the humidity levels begin to steadily decrease, leading to a more comfortable atmospheric condition. Weather in September »
Weather in October
October in Kalutara exhibits a drier atmosphere, a slight incline in temperature, and reduced cloudiness. With a considerable decline in rain, compared to September, October has 192mm (7.56") of average rainfall. Outdoor activities become more favorable owing to the decline in rainfall and an increase in sunshine duration. Weather in October »
Weather in November
November continues Kalutara's dry season affording lesser rains as the city gears up to welcome the year-end festivities. Despite the drop in rainfall, the maximum temperature remains consistent at 29.8°C (85.6°F). November boasts more sunshine days, adding to the charm of visiting Kalutara during this period. Weather in November »
Weather in December
December rounds up the year with lesser rains, moderate temperatures, and favourable beach conditions. The highest temperature in December reaches an average of 29.7°C (85.5°F), closing the year on a warm note. With 93mm (3.66") of rainfall spread over 16.5 days, December records the lowest rainfall days of the year. Weather in December »
[Resources]Frequently asked questions
What are the least humid months in Kalutara?
January and February, with an average relative humidity of 75%, are the least humid months in Kalutara.
What is the driest month in Kalutara?
The month with the least rainfall is January, when the rain falls for 8.9 days and typically collects 25mm (0.98") of precipitation.
How many days does it rain in Kalutara?
In Kalutara, Sri Lanka, during the entire year, the rain falls for 273.8 days and collects up to 2059mm (81.06") of precipitation.
What month has the most sunshine in Kalutara?
January has the most sunshine of the year, with an average of 9.2h of sunshine.
What is the month with the highest UV index in Kalutara?
January through April, July, September through December, with an average maximum UV index of 7, are months with the highest UV index in Kalutara, Sri Lanka.
What time of the year is the hottest in Kalutara?
The peak of Kalutara's temperatures is noted during March and April, averaging a high-temperature of 31.3°C (88.3°F).
What is the month with the warmest sea water in Kalutara?
The month with the warmest seawater is April, with an average sea temperature of 29.6°C (85.3°F).
When is the lowest UV index in Kalutara?
May, June and August, with an average maximum UV index of 6, are months with the lowest UV index.
What is the most humid month in Kalutara?
The months with the highest humidity in Kalutara, Sri Lanka, are June through August, with an average relative humidity of 83%.
What is the rainiest month in Kalutara?
June is the month with the most rainfall. Rain falls for 29.2 days and accumulates 350mm (13.78") of precipitation.
When are the longest days in Kalutara?
June has the longest days of the year in Kalutara, with an average of 12h and 30min of daylight.
What part of the year is the coldest in Kalutara?
The coldest temperatures in Kalutara, Sri Lanka, occur during August, when averages reach a peak of 28.6°C (83.5°F) and a low of 25.5°C (77.9°F).
What is the month with the coldest sea water in Kalutara?
With an average sea temperature of 27.2°C (81°F), August is the month with the coldest seawater in Kalutara.
What is the month with the least sunshine in Kalutara?
The month with the least sunshine is November, with an average of 6.8h of sunshine.
What is the month with the shortest days in Kalutara?
The month with the shortest days is December, with an average of 11h and 48min of daylight.
Is there Daylight Saving Time (DST) in Kalutara?
Kalutara, Sri Lanka, does not observe Daylight Saving Time (DST). +0530 timezone is used over the entire year.
Average temperature
Kalutara, Sri Lanka
The warmest months (with the highest average high temperature) are March and April (31.3°C).
The month with the lowest average high temperature is August (28.6°C).
The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is January (23.4°C).
Average pressure
Kalutara, 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:
1008.7mbar - Average pressure in June:
1008.8mbar
- Average pressure in July:
1008.9mbar - Average pressure in August:
1009.2mbar - Average pressure in September:
1009.9mbar - Average pressure in October:
1010mbar - Average pressure in November:
1009.9mbar - 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 (1008.7mbar).
Average wind speed
Kalutara, Sri Lanka
- Average wind speed in January:
12.2km/h - Average wind speed in February:
9.4km/h - Average wind speed in March:
7.9km/h - Average wind speed in April:
8.7km/h - Average wind speed in May:
13.3km/h - Average wind speed in June:
15.9km/h
- Average wind speed in July:
14.9km/h - Average wind speed in August:
15.1km/h - Average wind speed in September:
13.6km/h - Average wind speed in October:
10.6km/h - Average wind speed in November:
9.1km/h - Average wind speed in December:
11.3km/h
The windiest month (with the highest average wind speed) is June (15.9km/h).
The calmest month (with the lowest average wind speed) is March (7.9km/h).
Average humidity
Kalutara, Sri Lanka
The months with the highest relative humidity are June, July and August (83%).
The months with the lowest relative humidity are January and February (75%).
Average rainfall
Kalutara, Sri Lanka
- Average rainfall in January:
25mm - Average rainfall in February:
32mm - Average rainfall in March:
61mm - Average rainfall in April:
127mm - Average rainfall in May:
303mm - Average rainfall in June:
350mm
- Average rainfall in July:
260mm - Average rainfall in August:
282mm - Average rainfall in September:
201mm - Average rainfall in October:
192mm - Average rainfall in November:
133mm - Average rainfall in December:
93mm
The wettest month (with the highest rainfall) is June (350mm).
The driest month (with the least rainfall) is January (25mm).
Average rainfall days
Kalutara, Sri Lanka
- Average rainfall days in January:
8.9 days - Average rainfall days in February:
11.5 days - Average rainfall days in March:
19.9 days - Average rainfall days in April:
25.8 days - Average rainfall days in May:
28 days - Average rainfall days in June:
29.2 days
- Average rainfall days in July:
29.5 days - Average rainfall days in August:
29.5 days - Average rainfall days in September:
26.3 days - Average rainfall days in October:
25.2 days - Average rainfall days in November:
23.5 days - Average rainfall days in December:
16.5 days
The months with the highest number of rainy days are July and August (29.5 days).
The month with the least rainy days is January (8.9 days).
Average sea temperature
Kalutara, 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
Kalutara, 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 5min
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 48min).
- Average sunshine in January:
9h and 1min - Average sunshine in February:
9h and 0min - 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 1min
- 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 5min - Average sunshine in December:
7h and 1min
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 48min).
Average sunshine days
Kalutara, Sri Lanka
- Average sunshine days in January:
21 days - Average sunshine days in February:
13.8 days - Average sunshine days in March:
7.4 days - Average sunshine days in April:
2.3 days - Average sunshine days in May:
1.2 days - Average sunshine days in June:
0.3 days
- Average sunshine days in July:
0.3 days - Average sunshine days in August:
0.5 days - Average sunshine days in September:
1.4 days - Average sunshine days in October:
3.4 days - Average sunshine days in November:
5.8 days - Average sunshine days in December:
12.5 days
The month with the most sunshine days is January (21 days).
The months with the least sunshine days are June and July (0.3 days).
Average UV index
Kalutara, Sri Lanka
The months with the highest UV index are January, February, March, April, July, September, October, November and December (UV index 7).
The months with the lowest UV index are May, June and August (UV index 6).
Average cloud cover
Kalutara, 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
Kalutara, Sri Lanka
The months with the highest visibility are January, February, March, April, November and December (10km).
The months with the lowest visibility are May, June, July, August, September and October (9km).
Kalutara, Sri Lanka
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