Sea temperature - Sri Lanka: month by month
Average sea temperature each month - a rough guide to when it's worth going. Current month highlighted.
| Month | Average | Warmest |
|---|---|---|
| January | 28.1°C | Bentota 28.3°C |
| February | 28.5°C | Bentota 28.7°C |
| March | 29.4°C | Bentota 29.7°C |
| April | 30.4°C | Bentota 30.7°C |
| May | 29.6°C | Bentota 30.1°C |
| June | 28.5°C | Bentota 28.9°C |
| July | 27.9°C | Bentota 28.6°C |
| August | 28.1°C | Bentota 28.4°C |
| September | 28.6°C | Bentota 28.6°C |
| October | 28.8°C | Bentota 28.9°C |
| November | 29.2°C | Mirissa 29.3°C |
| December | 28.6°C | Bentota 28.7°C |
Frequently asked questions
In which month is the sea warmest?
Warmest: April, about 30.4°C on average.
When is the sea coldest?
Coldest: July, about 27.9°C on average.
What is the sea temperature in summer?
In summer (June-August) about 28.2°C on average.
In which months is the sea warmest?
The sea usually exceeds 24°C from January to December.
Sea temperature - Sri Lanka, January
Average (January): about 28.1°C. Warmest: Bentota (28.3°C).
Sea temperature - Sri Lanka, February
Average (February): about 28.5°C. Warmest: Bentota (28.7°C).
Sea temperature - Sri Lanka, March
Average (March): about 29.4°C. Warmest: Bentota (29.7°C).
Sea temperature - Sri Lanka, April
Average (April): about 30.4°C. Warmest: Bentota (30.7°C).
Sea temperature - Sri Lanka, May
Average (May): about 29.6°C. Warmest: Bentota (30.1°C).
Sea temperature - Sri Lanka, June
Average (June): about 28.5°C. Warmest: Bentota (28.9°C).
Sea temperature - Sri Lanka, July
Average (July): about 27.9°C. Warmest: Bentota (28.6°C).
Sea temperature - Sri Lanka, August
Average (August): about 28.1°C. Warmest: Bentota (28.4°C).
Sea temperature - Sri Lanka, September
Average (September): about 28.6°C. Warmest: Bentota (28.6°C).
Sea temperature - Sri Lanka, October
Average (October): about 28.8°C. Warmest: Bentota (28.9°C).
Sea temperature - Sri Lanka, November
Average (November): about 29.2°C. Warmest: Mirissa (29.3°C).
Sea temperature - Sri Lanka, December
Average (December): about 28.6°C. Warmest: Bentota (28.7°C).