Kahaluu Beach Park Water Temperature
Updated Mon 04:31 (Pacific/Honolulu)
USA · Forecast updated Sep 28, 2026, 04:31 UTC
Current Sea Temperature
28.4°C
83.1°F
Very warm water
Valid Sep 28, 2026, 04:31 (Pacific/Honolulu). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
1.0°C above
The typical September average is 27.4°C (81.3°F) from the historical baseline.
Recent trend
Cooling by 0.4°C
Seven-day average: 28.2°C, versus 28.6°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.
Typical Sea Temperature Over the Year
In the historical baseline for Kahaluu Beach Park, typical monthly averages range from about 25.3°C (77.5°F) in February to 27.4°C (81.3°F) in September.
Over the past 30 days, the average sea temperature in Kahaluu Beach Park has been 28.5°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Kahaluu Beach Park, calculated from hourly observations for 2023–2025. 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 | 25.3°C / 77.5°F |
| March | 25.1–25.7°C | 25.3°C / 77.5°F |
| April | 25.2–26.1°C | 25.6°C / 78.1°F |
| May | 25.9–26.4°C | 26.1°C / 79.0°F |
| June | 26.4–26.8°C | 26.6°C / 79.9°F |
| July | 26.7–27.1°C | 26.9°C / 80.4°F |
| August | 27.1–27.3°C | 27.3°C / 81.1°F |
| September | 27.2–27.6°C | 27.4°C / 81.3°F |
| October | 27.1–27.2°C | 27.2°C / 81.0°F |
| November | 26.6–27.1°C | 26.8°C / 80.2°F |
| December | 26.0–26.4°C | 26.3°C / 79.3°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (19.54, -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.
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.
Kahaluu Beach Park in January
Typical January water temperature near Kahaluu Beach Park is 25.5°C (77.9°F), with yearly monthly means from 25.3–25.8°C.
Kahaluu Beach Park in February
Typical February water temperature near Kahaluu Beach Park is 25.3°C (77.5°F), with yearly monthly means from 25.1–25.4°C.
Kahaluu Beach Park in March
Typical March water temperature near Kahaluu Beach Park is 25.3°C (77.5°F), with yearly monthly means from 25.1–25.7°C.
Kahaluu Beach Park in April
Typical April water temperature near Kahaluu Beach Park is 25.6°C (78.1°F), with yearly monthly means from 25.2–26.1°C.
Kahaluu Beach Park in May
Typical May water temperature near Kahaluu Beach Park is 26.1°C (79.0°F), with yearly monthly means from 25.9–26.4°C.
Kahaluu Beach Park in June
Typical June water temperature near Kahaluu Beach Park is 26.6°C (79.9°F), with yearly monthly means from 26.4–26.8°C.
Kahaluu Beach Park in July
Typical July water temperature near Kahaluu Beach Park is 26.9°C (80.4°F), with yearly monthly means from 26.7–27.1°C.
Kahaluu Beach Park in August
Typical August water temperature near Kahaluu Beach Park is 27.3°C (81.1°F), with yearly monthly means from 27.1–27.3°C.
Kahaluu Beach Park in September
Typical September water temperature near Kahaluu Beach Park is 27.4°C (81.3°F), with yearly monthly means from 27.2–27.6°C.
Kahaluu Beach Park in October
Typical October water temperature near Kahaluu Beach Park is 27.2°C (81.0°F), with yearly monthly means from 27.1–27.2°C.
Kahaluu Beach Park in November
Typical November water temperature near Kahaluu Beach Park is 26.8°C (80.2°F), with yearly monthly means from 26.6–27.1°C.
Kahaluu Beach Park in December
Typical December water temperature near Kahaluu Beach Park is 26.3°C (79.3°F), with yearly monthly means from 26.0–26.4°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 | 27.3°C / 81.1°F | 27.7°C / 81.9°F | 28.2°C / 82.8°F |
| July | 26.9°C / 80.4°F | 27.9°C / 82.2°F | 28.7°C / 83.7°F |
| August | 27.3°C / 81.1°F | 28.1°C / 82.5°F | 29.0°C / 84.2°F |
| September | 27.3°C / 81.1°F | 28.4°C / 83.2°F | 29.3°C / 84.7°F |
| October | 28.7°C / 83.7°F | 28.8°C / 83.9°F | 28.9°C / 84.0°F |
Partial coverage: 5 calendar months with records. Profile calculated from 2273 hourly forecast records across 5 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Kahaluu Beach Park
Accessible Kona snorkel beach with reef fish, turtles and beginner-friendly facilities.
- Area
- Kailua-Kona
- Local timing
- Morning
- Exposure
- Protected Kona reef
- Entry type
- Sandy/rocky entry with shallow reef
- Difficulty
- Easy
Kahaluu Beach Park Water Temperature: Common Questions
What is the water temperature in Kahaluu Beach Park today?
The current sea surface temperature near Kahaluu Beach Park is 28.4°C (83.1°F). Over the last 30 days, the average has been 28.5°C.
When is the water warmest in Kahaluu Beach Park?
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 Kahaluu Beach Park?
The water is typically coldest in February, at around 25.3°C (77.5°F) in the same historical baseline.
Can you swim in Kahaluu Beach Park today?
At 28.4°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 Kahaluu Beach Park.
View Snorkel Forecast →