Updated Tue 10:06 (Pacific/Honolulu)
USA · Forecast updated Sep 22, 2026, 10:06 UTC
Current Sea Temperature
28.0°C
82.4°F
Very 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
0.5°C above
The typical September average is 27.5°C (81.5°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 27.9°C, versus 27.8°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions or replace the snorkel forecast.
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.
In the historical baseline for Maui, typical monthly averages range from about 24.7°C (76.5°F) in February to 27.5°C (81.5°F) in September.
Over the past 30 days, the average sea temperature in Maui has been 27.9°C.
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Maui, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 25.2–25.5°C | 25.3°C / 77.5°F |
| February | 24.6–24.9°C | 24.7°C / 76.5°F |
| March | 24.5–25.3°C | 25.0°C / 77.0°F |
| April | 24.9–25.6°C | 25.4°C / 77.7°F |
| May | 25.9–26.2°C | 26.1°C / 79.0°F |
| June | 26.5–26.9°C | 26.6°C / 79.9°F |
| July | 26.7–27.2°C | 27.0°C / 80.6°F |
| August | 27.1–27.6°C | 27.4°C / 81.3°F |
| September | 27.3–27.9°C | 27.5°C / 81.5°F |
| October | 27.1–27.4°C | 27.3°C / 81.1°F |
| November | 26.4–26.7°C | 26.5°C / 79.7°F |
| December | 25.7–26.0°C | 25.8°C / 78.4°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (20.79, -156.46). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Each month uses the 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Typical January water temperature near Maui is 25.3°C (77.5°F), with yearly monthly means from 25.2–25.5°C.
Typical February water temperature near Maui is 24.7°C (76.5°F), with yearly monthly means from 24.6–24.9°C.
Typical March water temperature near Maui is 25.0°C (77.0°F), with yearly monthly means from 24.5–25.3°C.
Typical April water temperature near Maui is 25.4°C (77.7°F), with yearly monthly means from 24.9–25.6°C.
Typical May water temperature near Maui is 26.1°C (79.0°F), with yearly monthly means from 25.9–26.2°C.
Typical June water temperature near Maui is 26.6°C (79.9°F), with yearly monthly means from 26.5–26.9°C.
Typical July water temperature near Maui is 27.0°C (80.6°F), with yearly monthly means from 26.7–27.2°C.
Typical August water temperature near Maui is 27.4°C (81.3°F), with yearly monthly means from 27.1–27.6°C.
Typical September water temperature near Maui is 27.5°C (81.5°F), with yearly monthly means from 27.3–27.9°C.
Typical October water temperature near Maui is 27.3°C (81.1°F), with yearly monthly means from 27.1–27.4°C.
Typical November water temperature near Maui is 26.5°C (79.7°F), with yearly monthly means from 26.4–26.7°C.
Typical December water temperature near Maui is 25.8°C (78.4°F), with yearly monthly means from 25.7–26.0°C.
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 |
|---|---|---|---|
| January | 25.0°C / 77.0°F | 25.4°C / 77.6°F | 25.9°C / 78.6°F |
| February | 24.6°C / 76.3°F | 25.0°C / 77.0°F | 25.5°C / 77.9°F |
| March | 24.2°C / 75.6°F | 24.6°C / 76.3°F | 25.1°C / 77.2°F |
| April | 24.3°C / 75.7°F | 25.2°C / 77.4°F | 26.3°C / 79.3°F |
| May | 26.0°C / 78.8°F | 26.4°C / 79.5°F | 26.8°C / 80.2°F |
| June | 26.1°C / 79.0°F | 26.8°C / 80.2°F | 27.5°C / 81.5°F |
| July | 26.9°C / 80.4°F | 27.3°C / 81.2°F | 27.7°C / 81.9°F |
| August | 27.0°C / 80.6°F | 27.5°C / 81.6°F | 28.3°C / 82.9°F |
| September | 27.5°C / 81.5°F | 27.9°C / 82.3°F | 28.5°C / 83.3°F |
| October | 26.4°C / 79.5°F | 27.5°C / 81.5°F | 28.4°C / 83.1°F |
| November | 26.2°C / 79.2°F | 26.5°C / 79.7°F | 27.0°C / 80.6°F |
| December | 25.5°C / 77.9°F | 26.1°C / 78.9°F | 26.7°C / 80.1°F |
Profile calculated from 9044 hourly forecast records across 13 monthly periods. This is a growing archive, not a long-term climate normal.
Maui is a broad island forecast hub for comparing West, Northwest and South Maui snorkel spots. Use the individual beach reports for site-level calls, because wind, swell and visibility can vary sharply between bays on the same day.
The current sea surface temperature near Maui is 28.0°C (82.4°F). Over the last 30 days, the average has been 27.9°C.
The water is typically warmest in September, at around 27.5°C (81.5°F) in the 2023–2025 historical baseline.
The water is typically coldest in February, at around 24.7°C (76.5°F) in the same historical baseline.
At 28.0°C, the water is usually comfortable for swimming and snorkeling.
Prices and availability from Viator. Check conditions before you book.
We may earn a commission at no extra cost to you.
Free cancellation available
Free cancellation available
Free cancellation available
Free cancellation available
Free cancellation available
Free cancellation available
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Maui.
View Snorkel Forecast →