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Is it too cold to swim in Kailua today?
The latest reading is 80°F (26.7°C), measured November 5, 2026 at 2:26 AM HST at Mokapu Point, HI (098). That is warm water.
Above 77°F, the temperature below which cold water starts to affect breathing control. Temperature is only one factor: check rip current and surf alerts, and swim near lifeguards.
How cold is too cold to swim?Water temperature this week
Hourly water temperature at Mokapu Point, HI (098)
Water temperature through the year
Average water temperature by month, satellite 2016–2025. Warmest in September.
Average ocean temperature by month
| Month | Average | Coldest year | Warmest year |
|---|---|---|---|
| January | 76°F | 75°F | 77°F |
| February | 76°F | 74°F | 76°F |
| March | 76°F | 74°F | 77°F |
| April | 76°F | 76°F | 78°F |
| May | 77°F | 77°F | 79°F |
| June | 79°F | 78°F | 79°F |
| July | 79°F | 78°F | 81°F |
| August | 80°F | 79°F | 82°F |
| September | 81°F | 79°F | 82°F |
| October | 80°F | 79°F | 82°F |
| November | 79°F | 78°F | 81°F |
| December | 77°F | 76°F | 79°F |
Other water temperature readings nearby
| Source | Water | Distance | Updated |
|---|---|---|---|
| NASA JPL MUR satellite nearest water | 79°F | 0.3 mi | Nov 2 |
| Mokuoloe tide station | 80°F | 3.9 mi | 2 h ago |
| Honolulu tide station | 83°F | 11 mi | 2 h ago |
| Pearl Harbor Entrance, HI (233) buoy | 80°F | 16 mi | 82 min ago |
Water temperatures at nearby beaches
Frequently asked questions
Is it too cold to swim in Kailua today?
The latest reading is 80°F (26.7°C), measured November 5, 2026 at 2:26 AM HST at Mokapu Point, HI (098). That is warm water. Above 77°F, the temperature below which cold water starts to affect breathing control. Temperature is only one factor: check rip current and surf alerts, and swim near lifeguards. How cold is too cold?
When is the water warmest at Kailua?
Based on satellite data from 2016 to 2025, the water is warmest in September (average 81°F) and coldest in February (average 76°F).
Where does this water temperature come from?
From Mokapu Point, HI (098), a buoy operated by NOAA National Data Buoy Center, 3.7 mi away. See the methodology.
Sources: NOAA National Data Buoy Center; NASA JPL MUR satellite analysis; forecast and alerts from the National Weather Service. Readings are provisional. All Hawaii water temperatures · Methodology