Oahu Sea Temperature
USA · Forecast updated Jul 13, 2026, 06:05 UTC · refresh delayed
Current Sea Temperature
27.5°C
81.5°F
Warm water
Versus this month's average
Close to average
The July average in our archive is 27.3°C (81.2°F).
Recent trend
Holding fairly steady
Seven-day average: 27.2°C, versus 27.4°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 mean the sea is safe.
Sea Surface Temperature Over the Year
In the data collected for Oahu, monthly averages range from about 27.3°C (81.2°F) in July to 27.4°C (81.3°F) in June.
Over the past 30 days, the average sea temperature in Oahu has been 27.3°C.
Monthly Water Temperature Averages
| 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 | 27.3°C / 81.2°F | 27.8°C / 82.0°F |
Profile calculated from 427 hourly forecast records across 2 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 27.5°C. Over the last 30 days, the average has been 27.3°C.
When is the water warmest in Oahu?
The warmest monthly average in the Oahu archive is June, at around 27.4°C (81.3°F).
When is the water coldest in Oahu?
The coldest monthly average in the archive is July, at around 27.3°C (81.2°F).
Can you swim in Oahu today?
Yes — at 27.5°C the water is warm enough for comfortable 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 →