Month-specific sea-surface temperature · USA

Kaanapali Black Rock Sea Temperature in August

27.1°C

80.8°F

In August, sea-surface temperature near Kaanapali Black Rock has a historical monthly average of 27.1°C. This is not the reading for any particular holiday date.

Across 2023–2025, the lowest and highest yearly August monthly means were 26.8–27.5°C. These are not daily extremes.

Previous month

July · 26.6°C

Change into August: +0.5°C

Next month

September · 27.3°C

Change into next month: +0.2°C

Can you swim or snorkel in Kaanapali Black Rock in August?

At 27.1°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 August. Check again close to your trip.

Nearby places in August

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. Marine model grid near 20.93, -156.69. Based on 3 yearly monthly means and 2232 recorded samples. Source methodology.

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