INSTRUMENT / SEA TEMPERATURE
Updated Sat 14:55 (Pacific/Honolulu)
USA · Forecast updated Nov 7, 2026, 14:55 UTC
Current Sea Temperature
27.4°C
81.3°F
Warm water
Valid Nov 7, 2026, 14:55 (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 26.8°C (80.2°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 27.8°C, versus 27.8°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.
In the historical baseline for Kealakekua Bay, typical monthly averages range from about 25.2°C (77.4°F) in February to 27.4°C (81.3°F) in September.
Over the past 30 days, the average sea temperature in Kealakekua Bay has been 28.0°C.
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Kealakekua Bay, calculated from hourly observations for 2022–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 25.3–25.8°C | 25.5°C / 77.9°F |
| February | 25.1–25.4°C | 25.2°C / 77.4°F |
| March | 25.1–25.7°C | 25.3°C / 77.5°F |
| April | 25.1–26.1°C | 25.6°C / 78.1°F |
| May | 25.8–26.4°C | 26.1°C / 79.0°F |
| June | 26.4–26.7°C | 26.6°C / 79.9°F |
| July | 26.7–27.0°C | 26.9°C / 80.4°F |
| August | 27.0–27.3°C | 27.2°C / 81.0°F |
| September | 27.2–27.5°C | 27.4°C / 81.3°F |
| October | 27.1–27.2°C | 27.2°C / 81.0°F |
| November | 26.5–27.1°C | 26.8°C / 80.2°F |
| December | 26.0–26.4°C | 26.2°C / 79.2°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (19.46, -155.96). 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 2022–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Typical January water temperature near Kealakekua Bay is 25.5°C (77.9°F), with yearly monthly means from 25.3–25.8°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: December 26.2°C · February 25.2°C.
Explore Kealakekua Bay sea temperature in January, including swim comfort and month comparisons →
Typical February water temperature near Kealakekua Bay is 25.2°C (77.4°F), with yearly monthly means from 25.1–25.4°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: January 25.5°C · March 25.3°C.
Explore Kealakekua Bay sea temperature in February, including swim comfort and month comparisons →
Typical March water temperature near Kealakekua Bay is 25.3°C (77.5°F), with yearly monthly means from 25.1–25.7°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: February 25.2°C · April 25.6°C.
Explore Kealakekua Bay sea temperature in March, including swim comfort and month comparisons →
Typical April water temperature near Kealakekua Bay is 25.6°C (78.1°F), with yearly monthly means from 25.1–26.1°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: March 25.3°C · May 26.1°C.
Explore Kealakekua Bay sea temperature in April, including swim comfort and month comparisons →
Typical May water temperature near Kealakekua Bay is 26.1°C (79.0°F), with yearly monthly means from 25.8–26.4°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: April 25.6°C · June 26.6°C.
Explore Kealakekua Bay sea temperature in May, including swim comfort and month comparisons →
Typical June water temperature near Kealakekua Bay is 26.6°C (79.9°F), with yearly monthly means from 26.4–26.7°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: May 26.1°C · July 26.9°C.
Explore Kealakekua Bay sea temperature in June, including swim comfort and month comparisons →
Typical July water temperature near Kealakekua Bay is 26.9°C (80.4°F), with yearly monthly means from 26.7–27.0°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: June 26.6°C · August 27.2°C.
Explore Kealakekua Bay sea temperature in July, including swim comfort and month comparisons →
Typical August water temperature near Kealakekua Bay is 27.2°C (81.0°F), with yearly monthly means from 27.0–27.3°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: July 26.9°C · September 27.4°C.
Explore Kealakekua Bay sea temperature in August, including swim comfort and month comparisons →
Typical September water temperature near Kealakekua Bay is 27.4°C (81.3°F), with yearly monthly means from 27.2–27.5°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: August 27.2°C · October 27.2°C.
Explore Kealakekua Bay sea temperature in September, including swim comfort and month comparisons →
Typical October water temperature near Kealakekua Bay is 27.2°C (81.0°F), with yearly monthly means from 27.1–27.2°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: September 27.4°C · November 26.8°C.
Explore Kealakekua Bay sea temperature in October, including swim comfort and month comparisons →
Typical November water temperature near Kealakekua Bay is 26.8°C (80.2°F), with yearly monthly means from 26.5–27.1°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: October 27.2°C · December 26.2°C.
Explore Kealakekua Bay sea temperature in November, including swim comfort and month comparisons →
Typical December water temperature near Kealakekua Bay is 26.2°C (79.2°F), with yearly monthly means from 26.0–26.4°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: November 26.8°C · January 25.5°C.
Explore Kealakekua Bay sea temperature in December, including swim comfort and month comparisons →
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 | 26.6°C / 79.9°F | 27.4°C / 81.3°F | 28.4°C / 83.1°F |
| July | 26.9°C / 80.4°F | 27.9°C / 82.2°F | 28.9°C / 84.0°F |
| August | 27.1°C / 80.8°F | 28.1°C / 82.6°F | 29.3°C / 84.7°F |
| September | 27.3°C / 81.1°F | 28.5°C / 83.3°F | 29.5°C / 85.1°F |
| October | 27.4°C / 81.3°F | 28.1°C / 82.5°F | 28.9°C / 84.0°F |
| November | 27.4°C / 81.3°F | 27.7°C / 81.9°F | 28.3°C / 82.9°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3839 hourly forecast records across 6 monthly periods. This is a growing archive, not a long-term climate normal.
A marine sanctuary on the Big Island's Kona coast, Kealakekua Bay has some of Hawaii's healthiest coral and clearest water. The bay is most protected and snorkel-ready on calm, low-wind mornings.
The current sea surface temperature near Kealakekua Bay is 27.4°C (81.3°F). Over the last 30 days, the average has been 28.0°C.
The water is typically warmest in September, at around 27.4°C (81.3°F) in the 2022–2025 historical baseline.
The water is typically coldest in February, at around 25.2°C (77.4°F) in the same historical baseline.
At 27.4°C, the water is usually comfortable for swimming and snorkeling.
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See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Kealakekua Bay.
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