INSTRUMENT / SEA TEMPERATURE
Tunnels Beach Water Temperature
Updated Thu 05:00 (Pacific/Honolulu)
USA · Forecast updated Nov 12, 2026, 05:00 UTC
Current Sea Temperature
25.8°C
78.4°F
Warm water
Valid Nov 12, 2026, 05:00 (Pacific/Honolulu). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.9°C below
The typical November average is 26.7°C (80.1°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 26.2°C, versus 26.3°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 Tunnels Beach, typical monthly averages range from about 24.4°C (75.9°F) in February to 27.5°C (81.5°F) in October.
Over the past 30 days, the average sea temperature in Tunnels Beach has been 26.5°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Tunnels Beach, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 24.4–25.1°C | 24.9°C / 76.8°F |
| February | 24.3–24.5°C | 24.4°C / 75.9°F |
| March | 23.8–25.1°C | 24.4°C / 75.9°F |
| April | 24.3–25.6°C | 24.9°C / 76.8°F |
| May | 25.5–25.7°C | 25.6°C / 78.1°F |
| June | 26.1–26.6°C | 26.3°C / 79.3°F |
| July | 26.4–26.6°C | 26.5°C / 79.7°F |
| August | 26.7–27.3°C | 27.0°C / 80.6°F |
| September | 27.1–27.8°C | 27.3°C / 81.1°F |
| October | 27.2–28.0°C | 27.5°C / 81.5°F |
| November | 26.6–26.8°C | 26.7°C / 80.1°F |
| December | 25.8–26.0°C | 25.9°C / 78.6°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (22.38, -159.54). 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.
Tunnels Beach in January
Typical January water temperature near Tunnels Beach is 24.9°C (76.8°F), with yearly monthly means from 24.4–25.1°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: December 25.9°C · February 24.4°C.
Explore Tunnels Beach sea temperature in January, including swim comfort and month comparisons →
Tunnels Beach in February
Typical February water temperature near Tunnels Beach is 24.4°C (75.9°F), with yearly monthly means from 24.3–24.5°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: January 24.9°C · March 24.4°C.
Explore Tunnels Beach sea temperature in February, including swim comfort and month comparisons →
Tunnels Beach in March
Typical March water temperature near Tunnels Beach is 24.4°C (75.9°F), with yearly monthly means from 23.8–25.1°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: February 24.4°C · April 24.9°C.
Explore Tunnels Beach sea temperature in March, including swim comfort and month comparisons →
Tunnels Beach in April
Typical April water temperature near Tunnels Beach is 24.9°C (76.8°F), with yearly monthly means from 24.3–25.6°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: March 24.4°C · May 25.6°C.
Explore Tunnels Beach sea temperature in April, including swim comfort and month comparisons →
Tunnels Beach in May
Typical May water temperature near Tunnels Beach is 25.6°C (78.1°F), with yearly monthly means from 25.5–25.7°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: April 24.9°C · June 26.3°C.
Explore Tunnels Beach sea temperature in May, including swim comfort and month comparisons →
Tunnels Beach in June
Typical June water temperature near Tunnels Beach is 26.3°C (79.3°F), with yearly monthly means from 26.1–26.6°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: May 25.6°C · July 26.5°C.
Explore Tunnels Beach sea temperature in June, including swim comfort and month comparisons →
Tunnels Beach in July
Typical July water temperature near Tunnels Beach is 26.5°C (79.7°F), with yearly monthly means from 26.4–26.6°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: June 26.3°C · August 27.0°C.
Explore Tunnels Beach sea temperature in July, including swim comfort and month comparisons →
Tunnels Beach in August
Typical August water temperature near Tunnels Beach is 27.0°C (80.6°F), with yearly monthly means from 26.7–27.3°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: July 26.5°C · September 27.3°C.
Explore Tunnels Beach sea temperature in August, including swim comfort and month comparisons →
Tunnels Beach in September
Typical September water temperature near Tunnels Beach is 27.3°C (81.1°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 27.0°C · October 27.5°C.
Explore Tunnels Beach sea temperature in September, including swim comfort and month comparisons →
Tunnels Beach in October
Typical October water temperature near Tunnels Beach is 27.5°C (81.5°F), with yearly monthly means from 27.2–28.0°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: September 27.3°C · November 26.7°C.
Explore Tunnels Beach sea temperature in October, including swim comfort and month comparisons →
Tunnels Beach in November
Typical November water temperature near Tunnels Beach is 26.7°C (80.1°F), with yearly monthly means from 26.6–26.8°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: October 27.5°C · December 25.9°C.
Explore Tunnels Beach sea temperature in November, including swim comfort and month comparisons →
Tunnels Beach in December
Typical December water temperature near Tunnels Beach is 25.9°C (78.6°F), with yearly monthly means from 25.8–26.0°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: November 26.7°C · January 24.9°C.
Explore Tunnels Beach 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 | 25.5°C / 77.9°F | 25.7°C / 78.3°F | 25.9°C / 78.6°F |
| July | 25.5°C / 77.9°F | 26.6°C / 79.9°F | 27.3°C / 81.1°F |
| August | 25.9°C / 78.6°F | 26.9°C / 80.3°F | 27.6°C / 81.7°F |
| September | 26.1°C / 79.0°F | 26.8°C / 80.2°F | 27.7°C / 81.9°F |
| October | 26.2°C / 79.2°F | 26.8°C / 80.2°F | 27.6°C / 81.7°F |
| November | 25.7°C / 78.3°F | 26.1°C / 79.0°F | 26.5°C / 79.7°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3354 hourly forecast records across 6 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Tunnels Beach
Scenic north-shore reef with excellent summer snorkeling and serious winter surf exposure.
- Area
- North Shore
- Local timing
- Summer mornings
- Exposure
- North shore; avoid winter surf
- Entry type
- Outer reef and sandy beach
- Difficulty
- Moderate
Tunnels Beach Water Temperature: Common Questions
What is the water temperature in Tunnels Beach today?
The current sea surface temperature near Tunnels Beach is 25.8°C (78.4°F). Over the last 30 days, the average has been 26.5°C.
When is the water warmest in Tunnels Beach?
The water is typically warmest in October, at around 27.5°C (81.5°F) in the 2023–2025 historical baseline.
When is the water coldest in Tunnels Beach?
The water is typically coldest in February, at around 24.4°C (75.9°F) in the same historical baseline.
Can you swim in Tunnels Beach today?
At 25.8°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 Tunnels Beach.
View Snorkel Forecast →