Rarotonga sea temperature today: 24°C – beach water temperature, Rarotonga, Cook Islands
Cook Islands · South Pacific
Rarotonga
Sea
24.4°C75.9°F
Air
UV
Beach day
⁦23–28°C⁩

Last updated ·

Today, September 13, the sea temperature at Rarotonga is 24.4 °C (76 °F). That matches the usual average of 24.5 °C in September. Comfortable for swimming year-round.

Climate · monthly averages

Sea temperature by month

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.

Warmest in March (28.2°C). Coldest in August (24.5°C). Comfortable for swimming year-round.

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.
MonthSea · MinSea · AvgSea · MaxAir · MinAir · AvgAir · Max
January26.6°C27.3°C28.0°C25.6°C25.9°C26.1°C
February27.4°C28.0°C28.6°C26.1°C26.3°C26.6°C
March28.1°C28.2°C28.5°C26.3°C26.6°C26.8°C
April27.5°C27.9°C28.2°C25.7°C25.9°C26.1°C
May26.2°C26.9°C27.5°C24.9°C25.1°C25.2°C
June25.1°C25.8°C26.6°C23.8°C23.9°C24.1°C
July24.4°C25.2°C25.7°C23.2°C23.4°C23.6°C
August24.2°C24.5°C24.9°C22.6°C22.8°C23.0°C
September24.2°C24.5°C24.8°C22.8°C23.0°C23.2°C
October24.4°C24.8°C25.4°C23.0°C23.2°C23.4°C
November24.3°C24.9°C25.7°C23.4°C23.7°C23.9°C
December25.7°C26.1°C26.6°C24.8°C24.9°C25.1°C

About Rarotonga

The South Pacific's Cook Islands centre on Rarotonga, a 67 km² volcanic island ringed by a near-continuous fringing reef and crowned by Te Manga, a 652-metre jagged spire over the dramatic interior. Muri Beach scatters four small motus off the southeast coast, wadeable at low tide, while Titikaveka Beach on the south shore guards the calmest lagoon and richest snorkelling. Sea temperatures sit between 25 and 28 °C77 and 82 °F year-round, peaking at 27–28 °C81–82 °F in February and March; the airport lies under 25 minutes from any point.

Frequently asked questions

Today, September 13, the sea at Rarotonga is 24.4 °C (76 °F)76 °F (24.4 °C) – ideal for swimming for most people. The usual September average is 24.5 °C76 °F.

No single number works for everyone, so the scale on this page is only a guide to how the water feels: below 13 °C55 °F icy, 13–18 °C55–64 °F cold, 18–23 °C64–73 °F refreshing, 23–28 °C73–82 °F pleasantly warm and above 28 °C82 °F like a bath. Right now the sea at Rarotonga is 24.4 °C76 °F.

Yes – the sea at Rarotonga (South Pacific, Cook Islands) stays swimmable all year. August is the coolest month, averaging 24.5 °C76 °F – ideal for swimming for most people; the warmest is March at 28.2 °C83 °F.

In March, at 28.2 °C83 °F on average. The coolest month is August at 24.5 °C76 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.