Oahu Sea Temperature
Updated Wed 13:31 (Pacific/Honolulu)
USA · Forecast updated Aug 12, 2026, 13:31 UTC
Current Sea Temperature
28.0°C
82.4°F
Very warm water
Versus this month's average
Close to average
The August average in our archive is 27.9°C (82.2°F).
Recent trend
Holding fairly steady
Seven-day average: 27.9°C, versus 27.9°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
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 Oahu, monthly averages range from about 27.4°C (81.3°F) in June to 27.9°C (82.2°F) in August.
Over the past 30 days, the average sea temperature in Oahu has been 27.7°C.
Monthly Water Temperature Averages
Northern Hemisphere. Summer is generally June–August; winter is December–February.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 27.2°C / 81.0°F | 27.4°C / 81.3°F | 27.6°C / 81.7°F |
| July | 26.8°C / 80.2°F | 27.5°C / 81.5°F | 28.4°C / 83.1°F |
| August | 27.4°C / 81.3°F | 27.9°C / 82.2°F | 28.3°C / 82.9°F |
Profile calculated from 1154 hourly forecast records across 3 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Oahu
Oahu snorkel report hub for comparing protected bays, west-side reefs and seasonal shore exposure.
- Area
- Oahu
- Local timing
- Morning
- Exposure
- South, west, east and north shores vary by season
- Entry type
- Island hub
- Difficulty
- Varies by beach
Oahu Water Temperature: Common Questions
What is the sea temperature in Oahu today?
The current sea surface temperature in Oahu is 28.0°C. Over the last 30 days, the average has been 27.7°C.
When is the water warmest in Oahu?
The warmest monthly average in the Oahu archive is August, at around 27.9°C (82.2°F).
When is the water coldest in Oahu?
The coldest monthly average in the archive is June, at around 27.4°C (81.3°F).
Can you swim in Oahu today?
At 28.0°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 Oahu.
View Snorkel Forecast →