Hapuna Beach Water Temperature
Sea-surface temperature at Hapuna Beach, Hawaii · times in HST
Updated 1:03 AM HST
How it compares today
Water temperature through the year
Monthly normals computed from 2023–2025 daily sea-surface temperature history.
Nearby water right now
7-day outlook
| Day | Air high / low | Max UV | Rain |
|---|---|---|---|
| Fri, Aug 28 | 86° / 76° | 9 | 1% |
| Sat, Aug 29 | 88° / 76° | 8 | 6% |
| Sun, Aug 30 | 87° / 76° | 9 | 0% |
| Mon, Aug 31 | 87° / 76° | 9 | 10% |
| Tue, Sep 1 | 87° / 77° | 9 | 12% |
| Wed, Sep 2 | 89° / 77° | 8 | 14% |
| Thu, Sep 3 | 86° / 77° | 9 | 24% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is Hapuna Beach warm enough to swim?
At 83°F, the water at Hapuna Beach is warm — great for swimming. Most swimmers are comfortable without a wetsuit above 72°F; below 62°F, cold-water shock becomes a real risk for unprotected swimmers.
That is 1° above the August average of 82°F here.
The water stays above 70°F essentially year round, ranging from about 78°F to 82°F.
Frequently asked questions
How warm is the water at Hapuna Beach right now?
The sea-surface temperature is about 83°F. That is 1° above the August average of 82°F here.
When is the water warm enough to swim at Hapuna Beach?
The water stays above 70°F essentially year round, ranging from about 78°F to 82°F.
What is the warmest the water gets at Hapuna Beach?
Around 82°F in August, based on 2023–2025 records. The coolest month is January at roughly 78°F.