Negombo, Sri Lanka - Detailed climate information and monthly weather forecast

Warmest months (with the highest average high temperature) are February, March, April and May (31°C).
Months with the lowest average high temperature are June, July, August, September, October, November and December (29°C).

The average low temperature in January:
22°C
The average low temperature in February:
22°C
The average low temperature in March:
23°C
The average low temperature in April:
24°C
The average low temperature in May:
26°C
The average low temperature in June:
25°C

The average low temperature in July:
25°C
The average low temperature in August:
25°C
The average low temperature in September:
25°C
The average low temperature in October:
24°C
The average low temperature in November:
23°C
The average low temperature in December:
22°C

The month with the highest average low temperature is May (26°C).
Coldest months (with the lowest average low temperature) are January, February and December (22°C).

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The average rainfall in July:
135mm
The average rainfall in August:
109mm
The average rainfall in September:
160mm
The average rainfall in October:
348mm
The average rainfall in November:
315mm
The average rainfall in December:
147mm

The wettest month (with the highest rainfall) is May (371mm).
The driest month (with the lowest rainfall) is February (69mm).

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The average rainfall days in January:
4 days
The average rainfall days in February:
4 days
The average rainfall days in March:
8 days
The average rainfall days in April:
13 days
The average rainfall days in May:
12 days
The average rainfall days in June:
13 days

The average rainfall days in July:
10 days
The average rainfall days in August:
9 days
The average rainfall days in September:
12 days
The average rainfall days in October:
15 days
The average rainfall days in November:
15 days
The average rainfall days in December:
10 days

Months with the highest number of rainy days are October and November (15 days).
Months with the lowest number of rainy days are January and February (4 days).

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The average sea temperature in January:
27.6°C
The average sea temperature in February:
28.2°C
The average sea temperature in March:
29°C
The average sea temperature in April:
29.7°C
The average sea temperature in May:
29.3°C
The average sea temperature in June:
28.3°C

The average sea temperature in July:
27.3°C
The average sea temperature in August:
27°C
The average sea temperature in September:
27.6°C
The average sea temperature in October:
28.5°C
The average sea temperature in November:
28.8°C
The average sea temperature in December:
28°C

The best month for swimming (with the highest average sea temperature) is April (29.7°C).
The coldest month (with the lowest average sea temperature) is August (27°C).

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The month with the longest days is June (Average daylight: 13h).
Months with shortest days are January, February, March, April, May, July, August, September, October, November and December (Average daylight: 12h).

The month with most sunshine is March (Average sunshine: 9h).
Months with least sunshine are June, July, August, September and October (Average sunshine: 6).

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Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
Months with the lowest UV index are January, November and December (UV index 11).