Rarotonga Sea Temperature

Updated Sat 16:42 (Pacific/Rarotonga)

Cook Islands · Forecast updated Sep 5, 2026, 16:42 UTC

Current Sea Temperature

22.6°C

72.7°F

Mild water

Versus this month's average

Close to average

The September average in our archive is 22.6°C (72.8°F).

Recent trend

Holding fairly steady

Seven-day average: 22.5°C, versus 22.3°C in the prior seven days.

What to wear

Mild water

A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.

Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions.

Sea Surface Temperature Over the Year

In the data collected for Rarotonga, monthly averages range from about 22.6°C (72.8°F) in September to 24.9°C (76.8°F) in June.

Over the past 30 days, the average sea temperature in Rarotonga has been 22.7°C.

Southern Hemisphere. Summer is generally December–February; winter is June–August.

Month	Min	Average	Max
June	24.3°C / 75.7°F	24.9°C / 76.8°F	25.4°C / 77.7°F
July	23.4°C / 74.1°F	24.0°C / 75.2°F	24.9°C / 76.8°F
August	22.2°C / 72.0°F	22.9°C / 73.1°F	23.9°C / 75.0°F
September	22.3°C / 72.1°F	22.6°C / 72.8°F	23.4°C / 74.1°F

Profile calculated from 2329 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.

Island ringed by a shallow lagoon with marine reserves snorkelable from the beach.

The current sea surface temperature in Rarotonga is 22.6°C. Over the last 30 days, the average has been 22.7°C.

The warmest monthly average in the Rarotonga archive is June, at around 24.9°C (76.8°F).

The coldest monthly average in the archive is September, at around 22.6°C (72.8°F).

At 22.6°C, the water is usually comfortable for swimming and snorkeling.

See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Rarotonga.