Ko Olina Lagoons Water Temperature & Swim Forecast
Popular Hawaii beach near Kapolei.
Very warm water with a light chop and a light breeze — great swimming conditions.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Ko Olina Lagoons on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
No wetsuit
At 27.6°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Recommendation tuned for Ko Olina Lagoons's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Ko Olina Lagoons swimming conditions summary
- Water temperature
- 27.6°C
- Water feels
- Bath-warm
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 90/100 · Excellent
- Wetsuit needed
- No wetsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 27.0 °C
- Warmest months to swim
- June, July, August
At 27.6°C the water is warm enough to swim and surf in just a swimsuit or boardshorts. Model estimate. Water, wave, wind and UV values are Open-Meteo marine/weather model estimates, refreshed hourly — not buoy measurements.
Frequently asked questions
Can I swim at Ko Olina Lagoons right now?
The sea at Ko Olina Lagoons is currently 27.6°C — excellent swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.
What will the sea temperature be at Ko Olina Lagoons next week?
Based on long-term September averages and the latest marine model, expect the sea around Ko Olina Lagoons 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 Ko Olina Lagoons?
June – July – August are typically the warmest months to swim at Ko Olina Lagoons, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Ko Olina Lagoons?
With water currently at 27.6°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.
Can I swim at Ko Olina Lagoons today?
The sea is currently 27.6°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • 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 Ko Olina Lagoons
The sea in Ko Olina Lagoons 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.
Ko Olina Lagoons sea temperature history
Long-term climatology for Ko Olina Lagoons 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 Ko Olina Lagoons, 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.
Ko Olina Lagoons sea temperature: frequently asked questions
What is the warmest month to swim in Ko Olina Lagoons?
June is the warmest month in Ko Olina Lagoons, when the sea averages about 27°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Ko Olina Lagoons?
The coldest month in Ko Olina Lagoons is typically January, when the water averages around 24°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Ko Olina Lagoons without a wetsuit?
The main swimming season in Ko Olina Lagoons 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 Ko Olina Lagoons?
Ko Olina Lagoons 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 Ko Olina Lagoons?
The long-term annual mean sea temperature in Ko Olina Lagoons is about 26°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Ko Olina Lagoons?
The live reading at the top of this page shows the current sea temperature in Ko Olina Lagoons, 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.