Climate and monthly weather forecastSlave Island, Sri Lanka
Climate and monthly weather forecast
Weather in January
January is a hot winter month in Slave Island, Sri Lanka, with an average temperature ranging between min 23.1°C (73.6°F) and max 30.8°C (87.4°F). Slave Island's shift into January sets the average high-temperature at a tropical 30.8°C (87.4°F), a figure that deviates only slightly from December's 29.9°C (85.8°F). Weather in January »Weather in February
February, the last month of the winter in Slave Island, is also a hot month, with an average temperature fluctuating between 31.4°C (88.5°F) and 23.3°C (73.9°F). The introduction of February sees an average high-temperature of a still tropical 31.4°C (88.5°F), hardly deviating from January. Weather in February »Weather in March
March, the first month of the spring in Slave Island, is still a hot month, with temperature in the range of an average high of 31.8°C (89.2°F) and an average low of 24.3°C (75.7°F). Slave Island's warmest months, March and April, record an average high-temperature of 31.8°C (89.2°F). In March, the heat index is appraised at a blistering 42°C (107.6°F). Weather in March »Weather in April
April, like March, is a hot spring month in Slave Island, Sri Lanka, with an average temperature fluctuating between 25.8°C (78.4°F) and 31.8°C (89.2°F). March and April are the warmest months, with an average high-temperature of 31.8°C (89.2°F). The heat index value for April is appraised at a scorching 42°C (107.6°F). Weather in April »Weather in May
May, the last month of the spring in Slave Island, is another tropical month, with an average temperature ranging between max 30.6°C (87.1°F) and min 26.3°C (79.3°F). May denotes a minimal variation in the average high-temperature to a still hot 30.6°C (87.1°F) from April's 31.8°C (89.2°F). Weather in May »Weather in June
The first month of the summer, June, is still a warm month in Slave Island, Sri Lanka, with an average temperature ranging between max 29.3°C (84.7°F) and min 25.8°C (78.4°F). In June, Slave Island experiences a minor shift in meteorological conditions with average high-temperatures marked at a warm 29.3°C (84.7°F), closely mirroring the climate in May. Weather in June »Weather in July
July, like June, in Slave Island, Sri Lanka, is a moderately hot summer month, with an average temperature ranging between max 28.9°C (84°F) and min 25.3°C (77.5°F). The months of July and August are noted for their lowest temperatures, with an average high-temperature of 28.9°C (84°F). July's mean heat index is appraised at a torrid 35°C (95°F). Weather in July »Weather in August
August, the last month of the summer in Slave Island, is another warm month, with an average temperature ranging between max 28.9°C (84°F) and min 25.2°C (77.4°F). The months of July and August see the lowest levels of Slave Island's temperatures, averaging a high of 28.9°C (84°F). In August, the average heat index is appraised at a very hot 35°C (95°F). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Slave Island, Sri Lanka, with an average temperature fluctuating between 24.9°C (76.8°F) and 29.1°C (84.4°F). The advent of September reveals an average high-temperature of a still moderately hot 29.1°C (84.4°F), showing minimal difference from the prior month. Weather in September »Weather in October
October in Slave Island, Sri Lanka, is a hot autumn month, with temperature in the range of an average high of 30°C (86°F) and an average low of 25°C (77°F). October's onset brings an average high-temperature of a tropical 30°C (86°F), showing a minute difference from September's 29.1°C (84.4°F). Weather in October »Weather in November
November, the last month of the autumn in Slave Island, is also a hot month, with an average temperature ranging between min 24.5°C (76.1°F) and max 30.1°C (86.2°F). The transition into November is marked with an average high-temperature of a still hot 30.1°C (86.2°F), showing an insignificant shift from October's 30°C (86°F). Weather in November »Weather in December
The first month of the winter, December, is still a warm month in Slave Island, Sri Lanka, with temperature in the range of an average high of 29.9°C (85.8°F) and an average low of 23.7°C (74.7°F). In December, Slave Island notes an average high-temperature of a warm 29.9°C (85.8°F), hardly different from the preceding month. 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
The months with the lowest humidity in Slave Island are January and February, with an average relative humidity of 74%.
The month with the least rainfall in Slave Island is January, when the rain falls for 11.6 days and typically collects 40mm (1.57") of precipitation.
In Slave Island, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.
January has the most sunshine of the year in Slave Island, with an average of 9.1h of sunshine.
The months with the highest UV index are January through April, July, September, November and December, with an average maximum UV index of 7.
The highest point of temperatures in Slave Island falls in March and April, when the average high-temperature ascends to 31.8°C (89.2°F).
The months with the lowest UV index in Slave Island are May, June, August and October, with an average maximum UV index of 6.
The months with the highest humidity are June through August, with an average relative humidity of 83%.
June is the month with the most rainfall in Slave Island, Sri Lanka. Rain falls for 29.3 days and accumulates 341mm (13.43") of precipitation.
June has the longest days of the year, with an average of 12h and 30min of daylight.
Slave Island's average lowest temperatures are recorded in July and August, reaching a high of 28.9°C (84°F).
With an average of 6.7h of sunshine, November has the least sunshine of the year in Slave Island.
The month with the shortest days in Slave Island is December, with an average of 11h and 42min of daylight.
Slave Island does not utilize Daylight Saving Time (DST). +0530 timezone is used throughout the entire year.
Average temperature
Slave Island, Sri Lanka
The warmest months (with the highest average high temperature) are March and April (31.8°C).
The months with the lowest average high temperature are July and August (28.9°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 (23.1°C).
Average pressure
Slave Island, 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:
1008.7mbar - Average pressure in August:
1009.1mbar - Average pressure in September:
1009.8mbar - Average pressure in October:
1009.9mbar - 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
Slave Island, Sri Lanka
- Average wind speed in January:
12.8km/h - Average wind speed in February:
9.9km/h - Average wind speed in March:
8km/h - Average wind speed in April:
8.6km/h - Average wind speed in May:
12.9km/h - Average wind speed in June:
15.1km/h
- Average wind speed in July:
14.1km/h - Average wind speed in August:
14.2km/h - Average wind speed in September:
13.2km/h - Average wind speed in October:
10.2km/h - Average wind speed in November:
8.9km/h - Average wind speed in December:
11.5km/h
The windiest month (with the highest average wind speed) is June (15.1km/h).
The calmest month (with the lowest average wind speed) is March (8km/h).
Average humidity
Slave Island, 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 (74%).
Average rainfall
Slave Island, Sri Lanka
- Average rainfall in January:
40mm - Average rainfall in February:
47mm - Average rainfall in March:
66mm - Average rainfall in April:
137mm - Average rainfall in May:
306mm - Average rainfall in June:
341mm
- Average rainfall in July:
256mm - Average rainfall in August:
287mm - Average rainfall in September:
206mm - Average rainfall in October:
237mm - Average rainfall in November:
191mm - Average rainfall in December:
148mm
The wettest month (with the highest rainfall) is June (341mm).
The driest month (with the least rainfall) is January (40mm).
Average rainfall days
Slave Island, Sri Lanka
- Average rainfall days in January:
11.6 days - Average rainfall days in February:
13.8 days - Average rainfall days in March:
19.8 days - Average rainfall days in April:
25.4 days - Average rainfall days in May:
28.8 days - Average rainfall days in June:
29.3 days
- Average rainfall days in July:
29.8 days - Average rainfall days in August:
30.2 days - Average rainfall days in September:
26.9 days - Average rainfall days in October:
27 days - Average rainfall days in November:
25.7 days - Average rainfall days in December:
21.1 days
The month with the highest number of rainy days is August (30.2 days).
The month with the least rainy days is January (11.6 days).
Average daylight / Average sunshine
Slave Island, Sri Lanka
- Average daylight in January:
11h and 48min - Average daylight in February:
11h and 54min - Average daylight in March:
12h and 6min - Average daylight in April:
12h and 18min - Average daylight in May:
12h and 24min - Average daylight in June:
12h and 30min
- Average daylight in July:
12h and 30min - Average daylight in August:
12h and 18min - Average daylight in September:
12h and 12min - Average daylight in October:
12h and 0min - Average daylight in November:
11h and 48min - Average daylight in December:
11h and 42min
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 6min - Average sunshine in February:
9h and 0min - Average sunshine in March:
9h and 0min - Average sunshine in April:
8h and 54min - Average sunshine in May:
8h and 36min - Average sunshine in June:
8h and 0min
- Average sunshine in July:
7h and 36min - Average sunshine in August:
7h and 0min - Average sunshine in September:
7h and 24min - Average sunshine in October:
7h and 42min - Average sunshine in November:
6h and 42min - Average sunshine in December:
6h and 54min
The month with the most sunshine is January (Average sunshine: 9h and 6min).
The month with the least sunshine is November (Average sunshine: 6h and 42min).
Average sunshine days
Slave Island, Sri Lanka
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
12.7 days - Average sunshine days in March:
8.2 days - Average sunshine days in April:
2.6 days - Average sunshine days in May:
1.3 days - Average sunshine days in June:
0.3 days
- Average sunshine days in July:
0.4 days - Average sunshine days in August:
0.3 days - Average sunshine days in September:
1.5 days - Average sunshine days in October:
1.7 days - Average sunshine days in November:
3.6 days - Average sunshine days in December:
8.3 days
The month with the most sunshine days is January (17.2 days).
The months with the least sunshine days are June and August (0.3 days).
Average UV index
Slave Island, Sri Lanka
The months with the highest UV index are January, February, March, April, July, September, November and December (UV index 7).
The months with the lowest UV index are May, June, August and October (UV index 6).
Average cloud cover
Slave Island, Sri Lanka
The month with the most cloud cover is June (Cloud cover 57).
The month with the least cloud cover is January (Cloud cover 24).
Average visibility
Slave Island, Sri Lanka
The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are May, June, July, August, September, October and November (9km).
