Kapalua Bay Water Temperature
Updated Tue 10:06 (Pacific/Honolulu)
USA · Forecast updated Sep 22, 2026, 10:06 UTC
Current Sea Temperature
27.6°C
81.7°F
Warm water
Valid Sep 22, 2026, 10:06 (Pacific/Honolulu). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.4°C above
The typical September average is 27.2°C (81.0°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 27.6°C, versus 27.6°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 or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Kapalua Bay, typical monthly averages range from about 24.6°C (76.3°F) in February to 27.2°C (81.0°F) in September.
Over the past 30 days, the average sea temperature in Kapalua Bay has been 27.4°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Kapalua Bay, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 25.0–25.6°C | 25.3°C / 77.5°F |
| February | 24.5–24.7°C | 24.6°C / 76.3°F |
| March | 24.1–25.2°C | 24.7°C / 76.5°F |
| April | 24.5–25.7°C | 25.2°C / 77.4°F |
| May | 25.3–25.9°C | 25.6°C / 78.1°F |
| June | 26.0–26.6°C | 26.2°C / 79.2°F |
| July | 26.3–26.8°C | 26.6°C / 79.9°F |
| August | 26.8–27.4°C | 27.0°C / 80.6°F |
| September | 26.9–27.6°C | 27.2°C / 81.0°F |
| October | 26.5–27.4°C | 27.0°C / 80.6°F |
| November | 26.2–26.5°C | 26.4°C / 79.5°F |
| December | 25.6–26.0°C | 25.8°C / 78.4°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (21.04, -156.71). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Water temperature by month
Each month uses the 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Kapalua Bay in January
Typical January water temperature near Kapalua Bay is 25.3°C (77.5°F), with yearly monthly means from 25.0–25.6°C.
Kapalua Bay in February
Typical February water temperature near Kapalua Bay is 24.6°C (76.3°F), with yearly monthly means from 24.5–24.7°C.
Kapalua Bay in March
Typical March water temperature near Kapalua Bay is 24.7°C (76.5°F), with yearly monthly means from 24.1–25.2°C.
Kapalua Bay in April
Typical April water temperature near Kapalua Bay is 25.2°C (77.4°F), with yearly monthly means from 24.5–25.7°C.
Kapalua Bay in May
Typical May water temperature near Kapalua Bay is 25.6°C (78.1°F), with yearly monthly means from 25.3–25.9°C.
Kapalua Bay in June
Typical June water temperature near Kapalua Bay is 26.2°C (79.2°F), with yearly monthly means from 26.0–26.6°C.
Kapalua Bay in July
Typical July water temperature near Kapalua Bay is 26.6°C (79.9°F), with yearly monthly means from 26.3–26.8°C.
Kapalua Bay in August
Typical August water temperature near Kapalua Bay is 27.0°C (80.6°F), with yearly monthly means from 26.8–27.4°C.
Kapalua Bay in September
Typical September water temperature near Kapalua Bay is 27.2°C (81.0°F), with yearly monthly means from 26.9–27.6°C.
Kapalua Bay in October
Typical October water temperature near Kapalua Bay is 27.0°C (80.6°F), with yearly monthly means from 26.5–27.4°C.
Kapalua Bay in November
Typical November water temperature near Kapalua Bay is 26.4°C (79.5°F), with yearly monthly means from 26.2–26.5°C.
Kapalua Bay in December
Typical December water temperature near Kapalua Bay is 25.8°C (78.4°F), with yearly monthly means from 25.6–26.0°C.
Forecast archive (growing)
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| 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 | 27.5°C / 81.5°F | 28.3°C / 82.9°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2731 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 water temperature in Kapalua Bay today?
The current sea surface temperature near Kapalua Bay is 27.6°C (81.7°F). Over the last 30 days, the average has been 27.4°C.
When is the water warmest in Kapalua Bay?
The water is typically warmest in September, at around 27.2°C (81.0°F) in the 2023–2025 historical baseline.
When is the water coldest in Kapalua Bay?
The water is typically coldest in February, at around 24.6°C (76.3°F) in the same historical baseline.
Can you swim in Kapalua Bay today?
At 27.6°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 →