Hawaii Sea Temperature
Updated Wed 16:26 (Pacific/Honolulu)
USA · Forecast updated Aug 12, 2026, 16:26 UTC
Current Sea Temperature
27.3°C
81.1°F
Warm water
Versus this month's average
Close to average
The August average in our archive is 27.5°C (81.5°F).
Recent trend
Holding fairly steady
Seven-day average: 27.4°C, versus 27.5°C in the prior seven days.
What to wear
Warm water
Most people are comfortable in swimwear or a light rash guard.
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 Hawaii, monthly averages range from about 26.9°C (80.4°F) in June to 27.5°C (81.5°F) in August.
Over the past 30 days, the average sea temperature in Hawaii has been 27.4°C.
Monthly Water Temperature Averages
Northern Hemisphere. Summer is generally June–August; winter is December–February.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 26.6°C / 79.9°F | 26.9°C / 80.4°F | 27.3°C / 81.1°F |
| July | 26.7°C / 80.1°F | 27.3°C / 81.2°F | 28.0°C / 82.4°F |
| August | 27.0°C / 80.6°F | 27.5°C / 81.5°F | 28.2°C / 82.8°F |
Profile calculated from 1157 hourly forecast records across 3 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Hawaii
Hawaii snorkel report hub for comparing Maui, Oahu, Kauai and Big Island conditions before choosing a beach.
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Hawaii Water Temperature: Common Questions
What is the sea temperature in Hawaii today?
The current sea surface temperature in Hawaii is 27.3°C. Over the last 30 days, the average has been 27.4°C.
When is the water warmest in Hawaii?
The warmest monthly average in the Hawaii archive is August, at around 27.5°C (81.5°F).
When is the water coldest in Hawaii?
The coldest monthly average in the archive is June, at around 26.9°C (80.4°F).
Can you swim in Hawaii today?
At 27.3°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Hawaii.
View Snorkel Forecast →