Maui Sea Temperature in September

Can you swim or snorkel in Maui in September?

At 27.5°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.

Maui sits in the Pacific and its reefs usually have 24-28 °C water for much of the year. South and West Maui are often warmer and calmer than the exposed north shore in summer. Trade winds often rise in the afternoon, so mornings may be calmer.

Check the current waves, wind and snorkeling forecast →

A live forecast does not predict a future September. Check again close to your trip.

Waves and wind: recorded-model conditions for September

These figures come from a separately modelled, date-specific wind/wave backfill, not the NOAA SST series. A single observed season is not a climatological likelihood or a guarantee of safe conditions.

A “calm hour” meets fixed modelled wave/wind thresholds; neither visibility nor local currents, entry conditions or actual beach safety is measured here. Periods may differ by coast.

Nearby places in September

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

• Hawaii 27.5°C