Kailua Beach Water Temperature
Sea-surface temperature at Kailua Beach, Hawaii · times in HST
Updated 10:00 PM 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 |
|---|---|---|---|
| Mon, Oct 12 | 84° / 76° | 8 | 33% |
| Tue, Oct 13 | 82° / 76° | 7 | 94% |
| Wed, Oct 14 | 82° / 76° | 8 | 33% |
| Thu, Oct 15 | 82° / 76° | 8 | 81% |
| Fri, Oct 16 | 83° / 76° | 8 | 82% |
| Sat, Oct 17 | 81° / 74° | 8 | 69% |
| Sun, Oct 18 | 80° / 76° | 8 | 70% |
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 1° below the October average of 81°F here.
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 1° below the October average of 81°F here.
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.