Sri Lanka · Indian Ocean
Mirissa
Sea
82.9°F
Air
–
UV
–
Bathtub
Above 28°C
More like this
Climate · monthly averages
Sea temperature by month
5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.
75°F
79°F
82°F
86°F
90°F
93°F
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
MinMin °F
8282.3
8382.7
8484.3
8685.5
8483.9
8382.9
8181.3
8080.4
8282.0
8383.1
8484.3
8382.6
AvgAvg °F
8382.9
8483.5
8584.7
8686.1
8585.0
8483.7
8282.3
8282.3
8383.4
8483.9
8584.8
8483.6
MaxMax °F
8383.5
8484.0
8585.4
8787.0
8685.9
8484.3
8483.6
8484.1
8484.4
8584.5
8685.6
8584.6
Warmest in April (86.1°F). Coldest in August (82.3°F). Comfortable for swimming year-round.
About Mirissa
Sri Lanka's south coast turns Mirissa into one of the world's most reliable blue-whale viewpoints, with dawn boats from the harbour intercepting the Indian Ocean shipping lane between November and April. Mirissa Beach curves for a kilometre of fine sand backed by coconut palms, anchored by the tide-washed islet of Parrot Rock, while three kilometres west Weligama Beach runs flatter and broader as the island's surf-school capital. Sea temperatures hold 27–28 °C year-round.