INSTRUMENT / SEA TEMPERATURE
Poipu Beach Water Temperature
Updated Wed 13:02 (Pacific/Honolulu)
USA · Forecast updated Nov 11, 2026, 13:02 UTC
Current Sea Temperature
26.5°C
79.7°F
Warm water
Valid Nov 11, 2026, 13:02 (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 November average is 26.4°C (79.5°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 26.5°C, versus 26.5°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 26.6°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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: December 26.0°C · February 24.3°C.
Explore Poipu Beach sea temperature in January, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: January 25.0°C · March 24.4°C.
Explore Poipu Beach sea temperature in February, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: February 24.3°C · April 24.7°C.
Explore Poipu Beach sea temperature in March, including swim comfort and month comparisons →
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.
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 25.5°C.
Explore Poipu Beach sea temperature in April, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: April 24.7°C · June 26.0°C.
Explore Poipu Beach sea temperature in May, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: May 25.5°C · July 26.5°C.
Explore Poipu Beach sea temperature in June, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: June 26.0°C · August 27.0°C.
Explore Poipu Beach sea temperature in July, including swim comfort and month comparisons →
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.
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 Poipu Beach sea temperature in August, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: August 27.0°C · October 27.4°C.
Explore Poipu Beach sea temperature in September, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: September 27.3°C · November 26.4°C.
Explore Poipu Beach sea temperature in October, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: October 27.4°C · December 26.0°C.
Explore Poipu Beach sea temperature in November, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: November 26.4°C · January 25.0°C.
Explore Poipu 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 | 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 |
| October | 26.3°C / 79.3°F | 26.9°C / 80.5°F | 28.1°C / 82.6°F |
| November | 26.2°C / 79.2°F | 26.4°C / 79.6°F | 26.8°C / 80.2°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3338 hourly forecast records across 6 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 26.5°C (79.7°F). Over the last 30 days, the average has been 26.6°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 26.5°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 →