Hanauma Bay Water Temperature & Swim Forecast
Popular Hawaii beach near Honolulu.
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Location
Hanauma Bay on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Check live temperature
Live water temperature is loading — refresh in a moment for a precise recommendation.
Recommendation tuned for Hanauma Bay's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Hanauma Bay swimming conditions summary
- Water temperature
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- Water feels
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- Swimmable today
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- Swim conditions score
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- Wetsuit needed
- Check live temperature
- Air temperature
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- Waves
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- Wind
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- UV index
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- Warmest months to swim
- June, July, August
Live water temperature is loading — refresh in a moment for a precise recommendation. Live marine data updated hourly from Open-Meteo Marine.
Frequently asked questions
Can I swim at Hanauma Bay right now?
Live data is loading. Use the 7-day forecast above to plan your swim — conditions above 22°C are comfortable for most swimmers.
What will the sea temperature be at Hanauma Bay next week?
Based on long-term August averages and the latest marine model, expect the sea around Hanauma Bay to sit close to 27.0°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Hanauma Bay?
June – July – August are typically the warmest months to swim at Hanauma Bay, with sea temperatures at their seasonal peak.
Can I swim at Hanauma Bay today?
Live data is loading. In summer, this beach typically offers comfortable swimming conditions.
- • Located in Hawaii, United States (Pacific Ocean).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Hanauma Bay
The sea in Hanauma Bay peaks in June, when the water averages around 27°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically January at around 24°C, when cold-water swimmers dominate the coast.
Hanauma Bay sea temperature history
Long-term climatology for Hanauma Bay shows an annual mean sea temperature of 26°C, ranging from 24°C in winter to 27°C at the summer peak.
The seasonal swing is roughly 3°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Hanauma Bay, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Hanauma Bay sea temperature: frequently asked questions
What is the warmest month to swim in Hanauma Bay?
June is the warmest month in Hanauma Bay, when the sea averages about 27°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Hanauma Bay?
The coldest month in Hanauma Bay is typically January, when the water averages around 24°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Hanauma Bay without a wetsuit?
The main swimming season in Hanauma Bay runs from January – December — about 12 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Hanauma Bay?
Hanauma Bay stays warm year-round, so most swimmers never need a wetsuit — a rash guard is usually enough for sun and wildlife protection.
What is the average sea temperature in Hanauma Bay?
The long-term annual mean sea temperature in Hanauma Bay is about 26°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Hanauma Bay?
The live reading at the top of this page shows the current sea temperature in Hanauma Bay, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Jan – Feb – Mar – Apr – May – Jun – Jul – Aug – Sep – Oct – Nov – Dec
| Month | Sea | Comfort |
|---|---|---|
| Jan | 24°C | Warm |
| Feb | 24°C | Warm |
| Mar | 24°C | Warm |
| Apr | 25°C | Warm |
| May | 26°C | Hot |
| Jun ⭐ | 27°C | Hot |
| Jul | 27°C | Hot |
| Aug | 27°C | Hot |
| Sep | 27°C | Hot |
| Oct | 27°C | Hot |
| Nov | 26°C | Hot |
| Dec | 25°C | Warm |
Nearby beaches
The closest coastline, with live water temperatures.