Month-specific sea-surface temperature · USA

Big Island Sea Temperature in April

25.6°C

78.1°F

In April, sea-surface temperature near Big Island has a historical monthly average of 25.6°C. This is not the reading for any particular holiday date.

Across 2023–2025, the lowest and highest yearly April monthly means were 25.0–26.2°C. These are not daily extremes.

Previous month

March · 25.3°C

Change into April: +0.3°C

Next month

May · 26.2°C

Change into next month: +0.6°C

Can you swim or snorkel in Big Island in April?

At 25.6°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 April. Check again close to your trip.

Nearby places in April

Comparable historical averages from independent marine grid cells. Warmer water does not imply safe snorkeling.

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 8640 recorded samples. Source methodology.

Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.