Sri Lanka · Indian Ocean
Mirissa
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Climate · monthly averages
Sea temperature by month
30-year averages (1996–2025). Min/Max are typical daily lows and highs, not record extremes.
75°F
79°F
82°F
86°F
90°F
93°F
January
82.5°F(81°F–84°F)
February
83.2°F(82°F–84°F)
March
84.7°F(84°F–86°F)
April
85.8°F(85°F–87°F)
May
84.5°F(83°F–86°F)
June
83.1°F(82°F–85°F)
July
82.1°F(81°F–83°F)
August
82.1°F(80°F–84°F)
September
82.8°F(82°F–84°F)
October
83.5°F(82°F–85°F)
November
84.2°F(83°F–85°F)
December
83.2°F(82°F–84°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 | 8181.4 | 8282.3 | 8483.8 | 8584.5 | 8383.4 | 8281.9 | 8181.2 | 8080.3 | 8281.8 | 8282.4 | 8382.9 | 8282.1 |
| AvgAvg °F | 8282.5 | 8383.2 | 8584.7 | 8685.8 | 8584.5 | 8383.1 | 8282.1 | 8282.1 | 8382.8 | 8383.5 | 8484.2 | 8383.2 |
| MaxMax °F | 8483.6 | 8484.2 | 8685.6 | 8787.2 | 8686.1 | 8584.6 | 8383.4 | 8483.7 | 8484.1 | 8584.6 | 8585.2 | 8484.5 |
Warmest in April (85.8°F). Coldest in July (82.1°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.