Month-specific sea-surface temperature · USA
Big Island Sea Temperature in October
27.2°C
81.0°F
In October, sea-surface temperature near Big Island has a historical monthly average of 27.2°C. This is not the reading for any particular holiday date.
Across 2023–2025, the lowest and highest yearly October monthly means were 27.1–27.4°C. These are not daily extremes.
Previous month
September · 27.4°C
Change into October: -0.2°C
Next month
November · 26.8°C
Change into next month: -0.4°C
Can you swim or snorkel in Big Island in October?
At 27.2°C our temperature-only guide describes the water as warm water. Comfort depends on your cold tolerance, immersion time and wind. A historical average cannot determine whether conditions are safe on any given day.
Do you need a wetsuit?
Most people are comfortable in swimwear or a light rash guard.
Which beach should you choose?
Look for a beach sheltered from the actual forecast waves and wind on your visit. Exposure, currents and entry conditions vary even where water temperatures are similar. Follow local warnings.
Check the current waves, wind and snorkeling forecast →
A live forecast does not predict a future October. Check again close to your trip.
Nearby places in October
Comparable historical averages from independent marine grid cells. Warmer water does not imply safe snorkeling.
- Kealakekua Bay 27.2°C
- Two Step Honaunau 27.2°C
- Kahaluu Beach Park 27.2°C
- Anaehoomalu Bay 27.3°C
- Ahihi Kinau 27.1°C
- Maluaka Turtle Town 27.1°C
Data source and limitations
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2023–2025. Equal-weight average of 4 monitored coastal spots. Based on 3 yearly monthly means and 8928 recorded samples. Source methodology.
Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.