Kapalua Bay Sea Temperature
Updated Sat 17:49 (Pacific/Honolulu)
USA · Forecast updated Sep 5, 2026, 17:49 UTC
Current Sea Temperature
26.9°C
80.4°F
Warm water
Versus this month's average
0.4°C below
The September average in our archive is 27.3°C (81.1°F).
Recent trend
Holding fairly steady
Seven-day average: 27.3°C, versus 27.4°C in the prior seven days.
What to wear
Warm water
Most people are comfortable in swimwear or a light rash guard.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions.
Sea Surface Temperature Over the Year
In the data collected for Kapalua Bay, monthly averages range from about 26.4°C (79.6°F) in June to 27.3°C (81.1°F) in September.
Over the past 30 days, the average sea temperature in Kapalua Bay has been 27.0°C.
Monthly Water Temperature Averages
Northern Hemisphere. Summer is generally June–August; winter is December–February.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 25.9°C / 78.6°F | 26.4°C / 79.6°F | 27.1°C / 80.8°F |
| July | 25.9°C / 78.6°F | 26.6°C / 80.0°F | 27.3°C / 81.1°F |
| August | 25.7°C / 78.3°F | 26.8°C / 80.3°F | 27.7°C / 81.9°F |
| September | 27.0°C / 80.6°F | 27.3°C / 81.1°F | 27.7°C / 81.9°F |
Profile calculated from 2330 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Kapalua Bay
Sheltered by two reef-fringed points, Kapalua Bay is one of Maui's calmest and most protected snorkeling beaches, ideal for families and beginners. Best visibility comes on low-wind mornings.
- Area
- Maui, Hawaii
Kapalua Bay Water Temperature: Common Questions
What is the sea temperature in Kapalua Bay today?
The current sea surface temperature in Kapalua Bay is 26.9°C. Over the last 30 days, the average has been 27.0°C.
When is the water warmest in Kapalua Bay?
The warmest monthly average in the Kapalua Bay archive is September, at around 27.3°C (81.1°F).
When is the water coldest in Kapalua Bay?
The coldest monthly average in the archive is June, at around 26.4°C (79.6°F).
Can you swim in Kapalua Bay today?
At 26.9°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Kapalua Bay.
View Snorkel Forecast →