May Weather in Kalutara, Sri Lanka

Last updated: March 19, 2025

May in Kalutara, Sri Lanka is characterized by warm temperatures and high humidity, creating a tropical ambiance perfect for relaxation. The maximum temperature reaches 31°C (88°F), while the average hovers around 28°C (82°F), offering a delightful warmth for visitors. However, the weather is accompanied by significant precipitation, totaling 347 mm (13.7 in) across 30 rainy days, making umbrellas a necessary accessory. With an average humidity level of 76%, the air feels lush and vibrant. Whether you’re exploring the coastal beauty or enjoying local culture, May's weather sets a quintessential Sri Lankan scene.

May Temperature in Kalutara

In May, Kalutara, Sri Lanka, embraces the warmth of the approaching summer, with temperatures reflecting a delightful blend of tropical comfort. The month's minimum temperature, averaging 25°C (77°F), marks a gradual rise from the previous months, while the average temperature stabilizes at 28°C (82°F), inviting beachgoers and sun-seekers. As daytime heats up, the maximum temperature reaches a pleasant 31°C (88°F), providing ideal conditions for exploring the region's stunning landscapes or relaxing by the coast. This steady transition in May underscores a consistent trend toward warmer weather, making it an excellent time to experience Kalutara's vibrant atmosphere and natural beauty.

May Weather in Kalutara: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Kalutara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec808081828281818080808080
Data source: Temperature data for Kalutara generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Kalutara

In May, Kalutara, Sri Lanka, transforms into a veritable oasis, experiencing an impressive 347 mm (13.7 in) of rainfall over the course of the month. With precipitation recorded on all 30 days, the region is enveloped in a lush, vibrant atmosphere, marking a significant climatic peak just before the onset of the southwest monsoon. This spike in rainfall is in stark contrast to the preceding months, such as January and February, which see only 76 mm (3.0 in) and 65 mm (2.5 in), respectively. The consistent downpour in May not only sustains the area's rich biodiversity but also sets the stage for a continuation of high rainfall into June, which maintains a similar intensity with 330 mm (13.0 in). Overall, May stands out as a defining month, showcasing the climactic transitions that characterize Kalutara’s tropical climate and fostering an environment ripe for growth and rejuvenation.

May Precipitation Trends in Kalutara

The chart displays monthly precipitation patterns in Kalutara, with values for each month alongside May's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec7665118144347330263296277324292188
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Kalutara

In May, Kalutara, Sri Lanka experiences a humidity level of 76%, marking a slight increase from the preceding months of January to April, which saw averages around 73% to 74%. This uptick suggests the onset of the warmer and more humid season, as the region transitions into June, where humidity surges to 82%. Notably, May’s humidity reflects a trend that illustrates the gradual increase in moisture levels, setting the stage for the more oppressive humidity that characterizes the summer months. Overall, while May offers a comfortable humidity level compared to the intensifying summer, it signals the approach of more sultry conditions in the following months.

May Average Humidity in Kalutara

This chart illustrates the average monthly humidity levels in Kalutara, with May's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how May's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec77%73%74%74%76%82%82%83%82%81%80%80%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Kalutara

In May, Kalutara, Sri Lanka, continues to experience an extreme UV Index of 14, maintaining the trend of intense sun exposure seen in previous months, such as April when it peaked at 15. This consistency highlights the necessity for sun safety, as the burn time remains a mere 10 minutes, urging residents and visitors alike to take precautions. Following May, the UV Index begins to slightly decline, with June recording a decrease to 12. Throughout the year, the UV levels generally hover in the upper range, showcasing the region's need for vigilant sun protection to avoid harmful effects. For further information, visit the Kalutara UV Index page.

Maximum UV Index Levels in Kalutara for May

The chart shows the monthly maximum UV Index (UVI) for Kalutara in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec121414151412131414131110
Data source: Kalutara May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

May Sunshine in Kalutara

May in Kalutara, Sri Lanka, sees a delightful 314 hours of sunshine, reflecting a trend of consistent brightness as spring transitions into summer. The month continues a streak of robust sunlight, following the peak of 332 hours in March, and settling into a warm embrace that persists into June with 324 hours of sunny days. This pattern highlights the region's pleasant climate, as daylight gradually shifts from the earlier exuberance of spring to the more stable warmth of late spring and summer. With May's sunshine, visitors and locals alike can enjoy the vibrant beauty of Kalutara, making it an ideal time for outdoor activities, exploration, and relaxation under the Sri Lankan sun.

Monthly Sunshine Duration in Kalutara: May Highlighted

The May sunshine duration represents the total number of hours Kalutara experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec270h308h332h329h314h324h331h327h308h306h281h307h
Data source: Kalutara May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Kalutara During May

In Kalutara, Sri Lanka, the likelihood of sunny weather takes a noticeable dip in May, with only a 16% chance of sunshine. This marks a significant contrast to the preceding months of February and April, where sun-chasing enthusiasts enjoyed considerably brighter conditions, with chances of 47% and 44%, respectively. Following May, the cloud cover remains persistent into June and July, both also experiencing identical 16% chances of sun. As we observe the broader yearly trends, it becomes clear that the months leading up to May often provide a more favorable climate for outdoor activities, while the later months shift towards increased cloudiness and dampness. Thus, May stands out as a transitional period in Kalutara’s weather pattern, highlighting the importance of planning activities around these changing conditions.

Percentage of Sunny Days in May in Kalutara

The chart illustrates the percentage of sunny days in Kalutara throughout the year, with May highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Kalutara experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec18%47%32%44%16%21%16%8%19%17%15%48%
Data source: Kalutara May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Kalutara in May

In Kalutara, Sri Lanka, the rhythm of daylight unfolds in a captivating cycle throughout the year. January and February start with 11 hours of daylight, allowing for enjoyable early-year activities, while March signals a gradual transition with an increase to 12 hours. This trend continues into April and sustains through the middle months, solidifying an average of 12 hours daily until September. As the year wanes, daylight diminishes once again, tapering back to 11 hours in October, before settling into the shorter days of November and December. This predictable pattern offers residents and visitors a delightful blend of extended daylight during the vibrant mid-year months and a more reflective ambiance as the year closes.

Average Daylight Hours in Kalutara for May

The chart illustrates the variation in daylight duration in Kalutara throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 46m11h 54m12h 4m12h 15m12h 24m12h 28m12h 26m12h 18m12h 8m11h 57m11h 48m11h 44m
Data source: Kalutara daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Kalutara

In Kalutara, Sri Lanka, the wind patterns reveal an intriguing progression as the year unfolds. May marks a notable shift, with the average wind speed rising to 3.7 m/s (8 mph), signaling the approach of the monsoon season. This increase foreshadows the stronger gusts that dominate the following months, peaking in July at 4.8 m/s (11 mph). As spring transitions into summer, the breezy conditions enhance the coastal allure, making May an ideal time for water sports and beach excursions. Conversely, the year begins with gentler winds around 2.2 m/s in January, gradually gaining momentum through the months, emphasizing a clear trend towards brisk conditions as the region readies itself for the invigorating monsoonal shifts.

Average May Wind Speed in Kalutara

The chart displays monthly wind speed patterns in Kalutara, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.22.51.82.43.7 m/s4.34.84.34.23.63.62.0
Data source: Kalutara May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Kalutara Compares to Other Months

The weather in Kalutara changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of May's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Kalutara and find detailed weather information for every month.

May and January present two distinct weather patterns. In May, temperatures are consistently warm, ranging from a minimum of 25°C (77°F) to a maximum of 31°C (88°F), with an average of 28°C (82°F). However, this month also experiences significant rainfall, with 347 mm (13.7 in) distributed over 30 days, contributing to a high humidity level of 76%. In contrast, January sees slightly cooler temperatures, with a minimum of 20°C (69°F) and an average of 26°C (80°F), peaking at 31°C (89°F). Additionally, January is much drier, receiving only 76 mm (3.0 in) of precipitation over 9 days, while maintaining similar humidity levels at 77%. For a more detailed look at January weather, check out Kalutara weather in January.

In comparing the weather of May and February, we find distinct differences in temperature and precipitation patterns. May typically experiences warmer temperatures, with averages around 28°C (82°F) and highs reaching up to 31°C (88°F). In contrast, February has slightly cooler conditions with a minimum of 22°C (71°F), an average of 27°C (81°F), and a maximum of 32°C (90°F). Additionally, May is significantly wetter, receiving 347 mm (13.7 in) of rainfall over 30 days, while February sees much less precipitation at 65 mm (2.5 in) across just 11 days. The humidity remains relatively high in both months, with May at 76% and February at 73%. For more detailed insights, you can check out Kalutara weather in February.

In comparing the weather of May and March, May is notably warmer, with average temperatures reaching 28°C (82°F) and maximums peaking at 31°C (88°F), while March has slightly cooler averages of 27°C (82°F) and maximums at 32°C (90°F). However, March experiences significantly less rainfall, totaling 118 mm (4.7 in) over 16 days compared to May's heavy precipitation of 347 mm (13.7 in) across 30 days. Additionally, humidity levels are relatively comparable, standing at 76% for May and 74% for March. For more detailed insights, you can check Kalutara weather in March.

In comparing the weather between April and May, we see that both months have similar average temperatures, with May maintaining a minimum of 25°C and an average of 28°C, while April has a minimum of 24°C. However, April boasts slightly higher maximum temperatures, reaching up to 33°C compared to May's maximum of 31°C. Precipitation levels significantly differ, with May experiencing 347 mm over 30 days, while April only recorded 144 mm over 24 days. Humidity levels are slightly higher in May at 76%, compared to April's 74%. For more details on April's weather, you can check Kalutara weather in April.

May and June exhibit similar temperatures, with both months experiencing minimum temperatures of 25°C (77°F). However, May is slightly warmer on average, with an average of 28°C (82°F) compared to June's average of 27°C (81°F). Both months have high humidity, but June is marginally more humid at 82% compared to May's 76%. In terms of precipitation, May sees a bit more rain, recording 347 mm (13.7 in) over 30 days, while June has 330 mm (13.0 in) across 29 days. For a more detailed look at the weather in June, visit Kalutara weather in June.

In comparing the weather of May and July, both months experience warm temperatures, with May slightly hotter, averaging 28°C (82°F) compared to July's average of 27°C (81°F). The maximum temperatures are also a bit higher in May, reaching up to 31°C (88°F), while July peaks at 30°C (86°F). However, May is significantly wetter, with a total precipitation of 347 mm (13.7 in) over 30 days, compared to July's 263 mm (10.4 in) across 29 days. Additionally, humidity levels are higher in July at 82%, versus 76% in May. For a detailed look at July weather specifically, you can visit Kalutara weather in July.

In May, the weather is warmer with average temperatures reaching 28°C (82°F) and high humidity at 76%, while August presents slightly cooler conditions with an average of 27°C (80°F) and increased humidity at 83%. May also experiences higher rainfall, totaling 347 mm (13.7 in) over 30 days, compared to August's 296 mm (11.6 in) across 29 days. Overall, while both months are characterized by tropical weather, May tends to be hotter and wetter than August. For more details, you can check Kalutara weather in August.

May and September present distinct yet warm weather patterns. In May, temperatures typically range from a minimum of 25°C (77°F) to a maximum of 31°C (88°F), with an average of 28°C (82°F). The month experiences a significant amount of rainfall, totaling 347 mm (13.7 in) over 30 days, coupled with a humidity level of 76%. In contrast, September's temperatures are slightly cooler, with a minimum of 24°C (75°F), an average of 27°C (80°F), and a maximum of 30°C (86°F). Rainfall in September is less intense, with 277 mm (10.9 in) over 27 days and higher humidity at 82%. For more detailed information, you can check Kalutara weather in September.

In comparing the weather between May and October, both months exhibit warm temperatures, but May tends to be slightly hotter with an average temperature of 28°C (82°F) compared to October's 27°C (80°F). Precipitation levels are also similar, with May receiving about 347 mm (13.7 in) while October sees slightly less at 324 mm (12.7 in), with rainfall occurring consistently over 30 days in each month. Additionally, October experiences a higher humidity level at 81%, compared to May's 76%. For a more detailed look at weather specifics during October, visit Kalutara weather in October.

May and November exhibit contrasting weather patterns, though both months maintain a warm climate. In May, temperatures range from a minimum of 25°C (77°F) to a maximum of 31°C (88°F), with an average of 28°C (82°F). This month is also characterized by heavy rainfall, accumulating 347 mm (13.7 in) over 30 days, resulting in a humidity level of 76%. In contrast, November experiences slightly cooler temperatures, with a minimum of 23°C (74°F) and a maximum of 30°C (86°F), averaging 26°C (80°F). Precipitation is lower, totaling 292 mm (11.5 in) across 26 days, with humidity rising to 80%. For an in-depth look at November’s weather, you can visit Kalutara weather in November.

When comparing the weather in May and December, it’s clear that May tends to be warmer and significantly wetter. In May, temperatures range from a minimum of 25°C (77°F) to a maximum of 31°C (88°F), with an average of 28°C (82°F) and a hefty precipitation total of 347 mm (13.7 in) spread over 30 days. The humidity is also quite high at 76%. Conversely, December features slightly cooler temperatures, with a minimum of 22°C (72°F) and a maximum of 30°C (87°F) averaging around 26°C (80°F). Moreover, December experiences less rainfall, totaling 188 mm (7.4 in) over 19 days, accompanied by a marginally higher humidity level of 80%. For more detailed insights, you can check Kalutara weather in December.

Compare Kalutara's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Kalutara

As May unfolds in Kalutara, the weather shifts noticeably, bringing with it a blend of warmth and humidity. Days are generally warm, with temperatures averaging around 28°C, while frequent rainfall transforms the landscape into a vibrant green. This month typically records the highest precipitation of the year, with nearly every day experiencing some rainfall, making it a stark contrast to the drier months. The elevated humidity adds to the tropical atmosphere, inviting lush growth. For a deeper dive into Kalutara’s climate patterns throughout the year, explore our page on Kalutara Climate.