INSTRUMENT / SEA TEMPERATURE
Ulua Mokapu Water Temperature
Updated Tue 14:54 (Pacific/Honolulu)
USA · Forecast updated Nov 10, 2026, 14:54 UTC
Current Sea Temperature
27.2°C
81.0°F
Warm water
Valid Nov 10, 2026, 14:54 (Pacific/Honolulu). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.6°C above
The typical November average is 26.6°C (79.9°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 27.3°C, versus 27.2°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 Ulua Mokapu, typical monthly averages range from about 24.8°C (76.6°F) in February to 27.4°C (81.3°F) in September.
Over the past 30 days, the average sea temperature in Ulua Mokapu has been 27.5°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Ulua Mokapu, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 25.3–25.5°C | 25.4°C / 77.7°F |
| February | 24.7–24.9°C | 24.8°C / 76.6°F |
| March | 24.5–25.2°C | 25.0°C / 77.0°F |
| April | 24.8–25.6°C | 25.3°C / 77.5°F |
| May | 25.8–26.2°C | 26.0°C / 78.8°F |
| June | 26.3–26.9°C | 26.5°C / 79.7°F |
| July | 26.4–27.1°C | 26.8°C / 80.2°F |
| August | 27.1–27.5°C | 27.3°C / 81.1°F |
| September | 27.1–27.8°C | 27.4°C / 81.3°F |
| October | 26.9–27.5°C | 27.2°C / 81.0°F |
| November | 26.5–26.7°C | 26.6°C / 79.9°F |
| December | 25.7–26.1°C | 25.9°C / 78.6°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (20.71, -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.
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.
Ulua Mokapu in January
Typical January water temperature near Ulua Mokapu is 25.4°C (77.7°F), with yearly monthly means from 25.3–25.5°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: December 25.9°C · February 24.8°C.
Explore Ulua Mokapu sea temperature in January, including swim comfort and month comparisons →
Ulua Mokapu in February
Typical February water temperature near Ulua Mokapu is 24.8°C (76.6°F), with yearly monthly means from 24.7–24.9°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: January 25.4°C · March 25.0°C.
Explore Ulua Mokapu sea temperature in February, including swim comfort and month comparisons →
Ulua Mokapu in March
Typical March water temperature near Ulua Mokapu is 25.0°C (77.0°F), with yearly monthly means from 24.5–25.2°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: February 24.8°C · April 25.3°C.
Explore Ulua Mokapu sea temperature in March, including swim comfort and month comparisons →
Ulua Mokapu in April
Typical April water temperature near Ulua Mokapu is 25.3°C (77.5°F), with yearly monthly means from 24.8–25.6°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: March 25.0°C · May 26.0°C.
Explore Ulua Mokapu sea temperature in April, including swim comfort and month comparisons →
Ulua Mokapu in May
Typical May water temperature near Ulua Mokapu is 26.0°C (78.8°F), with yearly monthly means from 25.8–26.2°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: April 25.3°C · June 26.5°C.
Explore Ulua Mokapu sea temperature in May, including swim comfort and month comparisons →
Ulua Mokapu in June
Typical June water temperature near Ulua Mokapu is 26.5°C (79.7°F), with yearly monthly means from 26.3–26.9°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: May 26.0°C · July 26.8°C.
Explore Ulua Mokapu sea temperature in June, including swim comfort and month comparisons →
Ulua Mokapu in July
Typical July water temperature near Ulua Mokapu is 26.8°C (80.2°F), with yearly monthly means from 26.4–27.1°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: June 26.5°C · August 27.3°C.
Explore Ulua Mokapu sea temperature in July, including swim comfort and month comparisons →
Ulua Mokapu in August
Typical August water temperature near Ulua Mokapu is 27.3°C (81.1°F), with yearly monthly means from 27.1–27.5°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: July 26.8°C · September 27.4°C.
Explore Ulua Mokapu sea temperature in August, including swim comfort and month comparisons →
Ulua Mokapu in September
Typical September water temperature near Ulua Mokapu is 27.4°C (81.3°F), with yearly monthly means from 27.1–27.8°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: August 27.3°C · October 27.2°C.
Explore Ulua Mokapu sea temperature in September, including swim comfort and month comparisons →
Ulua Mokapu in October
Typical October water temperature near Ulua Mokapu is 27.2°C (81.0°F), with yearly monthly means from 26.9–27.5°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: September 27.4°C · November 26.6°C.
Explore Ulua Mokapu sea temperature in October, including swim comfort and month comparisons →
Ulua Mokapu in November
Typical November water temperature near Ulua Mokapu is 26.6°C (79.9°F), with yearly monthly means from 26.5–26.7°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: October 27.2°C · December 25.9°C.
Explore Ulua Mokapu sea temperature in November, including swim comfort and month comparisons →
Ulua Mokapu in December
Typical December water temperature near Ulua Mokapu is 25.9°C (78.6°F), with yearly monthly means from 25.7–26.1°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: November 26.6°C · January 25.4°C.
Explore Ulua Mokapu sea temperature in December, including swim comfort and month comparisons →
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 | 26.8°C / 80.2°F | 27.2°C / 80.9°F | 27.6°C / 81.7°F |
| July | 26.7°C / 80.1°F | 27.3°C / 81.1°F | 27.8°C / 82.0°F |
| August | 26.9°C / 80.4°F | 27.6°C / 81.7°F | 28.4°C / 83.1°F |
| September | 27.4°C / 81.3°F | 27.9°C / 82.2°F | 28.5°C / 83.3°F |
| October | 27.0°C / 80.6°F | 27.6°C / 81.7°F | 28.4°C / 83.1°F |
| November | 27.0°C / 80.6°F | 27.3°C / 81.1°F | 27.6°C / 81.7°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3316 hourly forecast records across 6 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Ulua Mokapu
Ulua and Mokapu are adjacent South Maui reef beaches with easy entries, coral shelves and frequent turtles. They are usually best early in the morning before trade winds roughen the surface.
- Area
- Maui, Hawaii
Ulua Mokapu Water Temperature: Common Questions
What is the water temperature in Ulua Mokapu today?
The current sea surface temperature near Ulua Mokapu is 27.2°C (81.0°F). Over the last 30 days, the average has been 27.5°C.
When is the water warmest in Ulua Mokapu?
The water is typically warmest in September, at around 27.4°C (81.3°F) in the 2023–2025 historical baseline.
When is the water coldest in Ulua Mokapu?
The water is typically coldest in February, at around 24.8°C (76.6°F) in the same historical baseline.
Can you swim in Ulua Mokapu today?
At 27.2°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 Ulua Mokapu.
View Snorkel Forecast →