Kailua Beach Water Temperature
Sea-surface temperature at Kailua 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 | 82° / 77° | 9 | 71% |
| Sat, Aug 29 | 82° / 74° | 8 | 80% |
| Sun, Aug 30 | 82° / 74° | 9 | 82% |
| Mon, Aug 31 | 81° / 75° | 9 | 88% |
| Tue, Sep 1 | 83° / 76° | 9 | 86% |
| Wed, Sep 2 | 82° / 76° | 9 | 87% |
| Thu, Sep 3 | 81° / 75° | 9 | 67% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is Kailua Beach warm enough to swim?
At 80°F, the water at Kailua 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 right on the August average of 80°F for this beach.
The water stays above 70°F essentially year round, ranging from about 76°F to 81°F.
Frequently asked questions
How warm is the water at Kailua Beach right now?
The sea-surface temperature is about 80°F. That is right on the August average of 80°F for this beach.
When is the water warm enough to swim at Kailua Beach?
The water stays above 70°F essentially year round, ranging from about 76°F to 81°F.
What is the warmest the water gets at Kailua Beach?
Around 81°F in October, based on 2023–2025 records. The coolest month is February at roughly 76°F.