Poipu Beach Water Temperature
Updated Sun 03:37 (Pacific/Honolulu)
USA · Forecast updated Sep 27, 2026, 03:37 UTC
Current Sea Temperature
27.3°C
81.1°F
Warm water
Valid Sep 27, 2026, 03:37 (Pacific/Honolulu). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
Close to average
The typical September average is 27.3°C (81.1°F) from the historical baseline.
Recent trend
Warming by 0.7°C
Seven-day average: 27.4°C, versus 26.7°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 Poipu Beach, typical monthly averages range from about 24.3°C (75.7°F) in February to 27.4°C (81.3°F) in October.
Over the past 30 days, the average sea temperature in Poipu Beach has been 27.2°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Poipu Beach, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 24.6–25.2°C | 25.0°C / 77.0°F |
| February | 24.2–24.4°C | 24.3°C / 75.7°F |
| March | 24.0–24.8°C | 24.4°C / 75.9°F |
| April | 24.3–25.1°C | 24.7°C / 76.5°F |
| May | 25.3–25.7°C | 25.5°C / 77.9°F |
| June | 25.9–26.4°C | 26.0°C / 78.8°F |
| July | 26.3–26.6°C | 26.5°C / 79.7°F |
| August | 26.7–27.3°C | 27.0°C / 80.6°F |
| September | 27.0–27.7°C | 27.3°C / 81.1°F |
| October | 27.2–27.8°C | 27.4°C / 81.3°F |
| November | 26.1–26.8°C | 26.4°C / 79.5°F |
| December | 25.8–26.3°C | 26.0°C / 78.8°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (21.88, -159.46). 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.
Poipu Beach in January
Typical January water temperature near Poipu Beach is 25.0°C (77.0°F), with yearly monthly means from 24.6–25.2°C.
Poipu Beach in February
Typical February water temperature near Poipu Beach is 24.3°C (75.7°F), with yearly monthly means from 24.2–24.4°C.
Poipu Beach in March
Typical March water temperature near Poipu Beach is 24.4°C (75.9°F), with yearly monthly means from 24.0–24.8°C.
Poipu Beach in April
Typical April water temperature near Poipu Beach is 24.7°C (76.5°F), with yearly monthly means from 24.3–25.1°C.
Poipu Beach in May
Typical May water temperature near Poipu Beach is 25.5°C (77.9°F), with yearly monthly means from 25.3–25.7°C.
Poipu Beach in June
Typical June water temperature near Poipu Beach is 26.0°C (78.8°F), with yearly monthly means from 25.9–26.4°C.
Poipu Beach in July
Typical July water temperature near Poipu Beach is 26.5°C (79.7°F), with yearly monthly means from 26.3–26.6°C.
Poipu Beach in August
Typical August water temperature near Poipu Beach is 27.0°C (80.6°F), with yearly monthly means from 26.7–27.3°C.
Poipu Beach in September
Typical September water temperature near Poipu Beach is 27.3°C (81.1°F), with yearly monthly means from 27.0–27.7°C.
Poipu Beach in October
Typical October water temperature near Poipu Beach is 27.4°C (81.3°F), with yearly monthly means from 27.2–27.8°C.
Poipu Beach in November
Typical November water temperature near Poipu Beach is 26.4°C (79.5°F), with yearly monthly means from 26.1–26.8°C.
Poipu Beach in December
Typical December water temperature near Poipu Beach is 26.0°C (78.8°F), with yearly monthly means from 25.8–26.3°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 | 26.0°C / 78.8°F | 26.1°C / 79.0°F | 26.3°C / 79.3°F |
| July | 26.0°C / 78.8°F | 26.7°C / 80.0°F | 28.1°C / 82.6°F |
| August | 26.6°C / 79.9°F | 27.2°C / 81.0°F | 28.2°C / 82.8°F |
| September | 26.5°C / 79.7°F | 27.2°C / 80.9°F | 27.7°C / 81.9°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2248 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Poipu Beach
Popular south-shore beach with protected pockets, reef fish and frequent turtles.
- Area
- South Shore
- Local timing
- Morning
- Exposure
- South shore; avoid strong south swell
- Entry type
- Sandy beach with protected cove
- Difficulty
- Easy
Poipu Beach Water Temperature: Common Questions
What is the water temperature in Poipu Beach today?
The current sea surface temperature near Poipu Beach is 27.3°C (81.1°F). Over the last 30 days, the average has been 27.2°C.
When is the water warmest in Poipu Beach?
The water is typically warmest in October, at around 27.4°C (81.3°F) in the 2023–2025 historical baseline.
When is the water coldest in Poipu Beach?
The water is typically coldest in February, at around 24.3°C (75.7°F) in the same historical baseline.
Can you swim in Poipu Beach today?
At 27.3°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 Poipu Beach.
View Snorkel Forecast →