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Contents
- 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 daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January, the same as December, is a moderately hot winter month in Heerassagala, Sri Lanka, with an average temperature fluctuating between 28.3°C (82.9°F) and 18.2°C (64.8°F). The weather during January records an average high-temperature of a still moderately hot 28.3°C (82.9°F), closely mirroring the preceding month. Weather in January »
Weather in February
The last month of the winter, February, is also a moderately hot month in Heerassagala, Sri Lanka, with an average temperature varying between 18.1°C (64.6°F) and 29.7°C (85.5°F). February's average high-temperature stands at a still moderately hot 29.7°C (85.5°F), showing little deviation from January's 28.3°C (82.9°F). Weather in February »
Weather in March
The first month of the spring, March, is a tropical month in Heerassagala, Sri Lanka, with temperature in the range of an average high of 31.5°C (88.7°F) and an average low of 19.2°C (66.6°F). March brings the highest temperatures, with an average high of 31.5°C (88.7°F) and an average low of 19.2°C (66.6°F). March's heat index is evaluated at a blisteringly hot 40°C (104°F). Weather in March »
Weather in April
April, like March, is another hot spring month in Heerassagala, Sri Lanka, with an average temperature ranging between max 31.2°C (88.2°F) and min 20.8°C (69.4°F). The shift into April records an average high-temperature of a still hot 31.2°C (88.2°F), subtly varied from March's 31.5°C (88.7°F). Weather in April »
Weather in May
May, the last month of the spring in Heerassagala, is another tropical month, with an average temperature varying between 30.1°C (86.2°F) and 21.8°C (71.2°F). Heerassagala registers an average high-temperature of a still hot 30.1°C (86.2°F) at the commencement of May, closely related to the preceding month. Weather in May »
Weather in June
The first month of the summer, June, is also a moderately hot month in Heerassagala, Sri Lanka, with an average temperature fluctuating between 21.8°C (71.2°F) and 29.3°C (84.7°F). The onset of June marks an average high-temperature of a moderately hot 29.3°C (84.7°F), hardly differing from May's 30.1°C (86.2°F). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Heerassagala, Sri Lanka, with an average temperature varying between 29.3°C (84.7°F) and 21.4°C (70.5°F). Heerassagala experiences an average high-temperature of a still warm 29.3°C (84.7°F) in July, mirroring June's climate. Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Heerassagala, Sri Lanka, with an average temperature varying between 29.2°C (84.6°F) and 21.2°C (70.2°F). Heerassagala's shift into August is marked by a subtle change to a still warm 29.2°C (84.6°F) from July's 29.3°C (84.7°F) in temperature. Weather in August »
Weather in September
September, the first month of the autumn in Heerassagala, is still a warm month, with an average temperature ranging between max 29.5°C (85.1°F) and min 21.1°C (70°F). As September takes hold, the average high-temperature is a still warm 29.5°C (85.1°F), nearly mirroring that of the previous month. Weather in September »
Weather in October
October, like September, in Heerassagala, Sri Lanka, is a moderately hot autumn month, with temperature in the range of an average low of 20.7°C (69.3°F) and an average high of 29.4°C (84.9°F). As Heerassagala transitions from September to October, the average high-temperatures adjust to a still moderately hot 29.4°C (84.9°F), nearly the same as the previous 29.5°C (85.1°F). Weather in October »
Weather in November
November, the last month of the autumn in Heerassagala, is also a moderately hot month, with an average temperature fluctuating between 28.3°C (82.9°F) and 20.1°C (68.2°F). The onset of November marks an average high-temperature of a still warm 28.3°C (82.9°F), hardly differing from October's 29.4°C (84.9°F). Weather in November »
Weather in December
The first month of the winter, December, is also a moderately hot month in Heerassagala, Sri Lanka, with an average temperature fluctuating between 19.5°C (67.1°F) and 27.5°C (81.5°F). The coldest month is December, with an average high-temperature of 27.5°C (81.5°F) and an average low-temperature of 19.5°C (67.1°F). During December, the heat index is evaluated at a tropical 31°C (87.8°F). Weather in December »
Updated: Feb 6, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the driest month in Heerassagala?
The month with the least rainfall in Heerassagala, Sri Lanka, is January, when the rain falls for 14.1 days and typically collects 38mm (1.5") of precipitation.
How many days does it rain in Heerassagala?
In Heerassagala, during the entire year, the rain falls for 278.4 days and collects up to 1466mm (57.72") of precipitation.
What are the months with the highest UV index in Heerassagala?
January through September, November and December, with an average maximum UV index of 6, are months with the highest UV index in Heerassagala.
What is the warmest month in Heerassagala?
In Heerassagala, the average highest temperatures are observed in March, with a high of 31.5°C (88.7°F) and a low of 19.2°C (66.6°F).
What is the least humid month in Heerassagala?
With an average relative humidity of 74%, March is the least humid month.
When are the longest days in Heerassagala?
With an average of 12h and 30min of daylight, June has the longest days of the year.
What month has the most sunshine in Heerassagala?
June has the most sunshine of the year in Heerassagala, Sri Lanka, with an average of 10.8h of sunshine.
What is the rainiest month in Heerassagala?
October is the month with the most rainfall. Rain falls for 27.4 days and accumulates 301mm (11.85") of precipitation.
When is the lowest UV index in Heerassagala?
October is the month with the lowest UV index, with an average maximum UV index of 5.
What part of the year is the coldest in Heerassagala?
Heerassagala, Sri Lanka, witnesses the coldest weather in December, with temperatures averaging a high of 27.5°C (81.5°F) and a low of 19.5°C (67.1°F).
What is the most humid month in Heerassagala?
December is the most humid month, with an average relative humidity of 84%.
What is the month with the shortest days in Heerassagala?
The month with the shortest days is December, with an average of 11h and 42min of daylight.
Is there Daylight Saving Time (DST) in Heerassagala?
Heerassagala, Sri Lanka, does not observe Daylight Saving Time (DST). +0530 timezone is used throughout the entire year.
What is the month with the least sunshine in Heerassagala?
With an average of 5.7h of sunshine, December has the least sunshine of the year.
Average temperature
Heerassagala, Sri Lanka
The warmest month (with the highest average high temperature) is March (31.5°C).
The month with the lowest average high temperature is December (27.5°C).
The months with the highest average low temperature are May and June (21.8°C).
The coldest month (with the lowest average low temperature) is February (18.1°C).
Average pressure
Heerassagala, Sri Lanka
- Average pressure in January:
1011.8mbar - Average pressure in February:
1011.5mbar - Average pressure in March:
1010.8mbar - Average pressure in April:
1009.6mbar - Average pressure in May:
1008.2mbar - Average pressure in June:
1008.1mbar
- Average pressure in July:
1008.2mbar - Average pressure in August:
1008.5mbar - Average pressure in September:
1009.3mbar - Average pressure in October:
1009.7mbar - Average pressure in November:
1009.8mbar - Average pressure in December:
1010.5mbar
The month with the highest atmospheric pressure is January (1011.8mbar).
The month with the lowest atmospheric pressure is June (1008.1mbar).
Average wind speed
Heerassagala, Sri Lanka
- Average wind speed in January:
7.7km/h - Average wind speed in February:
7.1km/h - Average wind speed in March:
5km/h - Average wind speed in April:
4.7km/h - Average wind speed in May:
9.3km/h - Average wind speed in June:
13.5km/h
- Average wind speed in July:
12.6km/h - Average wind speed in August:
11.6km/h - Average wind speed in September:
10.8km/h - Average wind speed in October:
6.8km/h - Average wind speed in November:
5.3km/h - Average wind speed in December:
6.7km/h
The windiest month (with the highest average wind speed) is June (13.5km/h).
The calmest month (with the lowest average wind speed) is April (4.7km/h).
Average humidity
Heerassagala, Sri Lanka
The month with the highest relative humidity is December (84%).
The month with the lowest relative humidity is March (74%).
Average rainfall
Heerassagala, Sri Lanka
- Average rainfall in January:
38mm - Average rainfall in February:
59mm - Average rainfall in March:
72mm - Average rainfall in April:
152mm - Average rainfall in May:
163mm - Average rainfall in June:
57mm
The wettest month (with the highest rainfall) is October (301mm).
The driest month (with the least rainfall) is January (38mm).
Average rainfall days
Heerassagala, Sri Lanka
- Average rainfall days in January:
14.1 days - Average rainfall days in February:
14.5 days - Average rainfall days in March:
18.9 days - Average rainfall days in April:
27 days - Average rainfall days in May:
28.6 days - Average rainfall days in June:
25.1 days
- Average rainfall days in July:
24.3 days - Average rainfall days in August:
25.8 days - Average rainfall days in September:
23.4 days - Average rainfall days in October:
27.4 days - Average rainfall days in November:
26.4 days - Average rainfall days in December:
22.9 days
The month with the highest number of rainy days is May (28.6 days).
The month with the least rainy days is January (14.1 days).
Average daylight / Average sunshine
Heerassagala, 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 3min - 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:
8h and 3min - Average sunshine in February:
8h and 4min - Average sunshine in March:
8h and 5min - Average sunshine in April:
9h and 2min - Average sunshine in May:
10h and 2min - Average sunshine in June:
10h and 5min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
8h and 4min - Average sunshine in September:
10h and 2min - Average sunshine in October:
7h and 5min - Average sunshine in November:
6h and 5min - Average sunshine in December:
5h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days
Heerassagala, Sri Lanka
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
12.4 days - Average sunshine days in March:
10.3 days - Average sunshine days in April:
1.8 days - Average sunshine days in May:
1.2 days - Average sunshine days in June:
1.7 days
- Average sunshine days in July:
2.8 days - Average sunshine days in August:
2.6 days - Average sunshine days in September:
3.9 days - Average sunshine days in October:
2.3 days - Average sunshine days in November:
3 days - Average sunshine days in December:
6.8 days
The month with the most sunshine days is January (14.8 days).
The month with the least sunshine days is May (1.2 days).
Average UV index
Heerassagala, Sri Lanka
The months with the highest UV index are January, February, March, April, May, June, July, August, September, November and December (UV index 6).
The month with the lowest UV index is October (UV index 5).
Average cloud cover
Heerassagala, Sri Lanka
The months with the most cloud cover are November and December (Cloud cover 47).
The month with the least cloud cover is March (Cloud cover 27).
Average visibility
Heerassagala, Sri Lanka
The months with the highest visibility are June, July and August (10km).
The months with the lowest visibility are January, February, March, April, November and December (8km).
