Poipu Beach Sea Temperature
Updated Wed 19:54 (Pacific/Honolulu)
USA · Forecast updated Aug 12, 2026, 19:54 UTC
Current Sea Temperature
27.4°C
81.3°F
Warm water
Versus this month's average
0.3°C above
The August average in our archive is 27.1°C (80.9°F).
Recent trend
Cooling by 0.3°C
Seven-day average: 27.0°C, versus 27.3°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.
Sea Surface Temperature Over the Year
In the data collected for Poipu Beach, monthly averages range from about 26.1°C (79.0°F) in June to 27.1°C (80.9°F) in August.
Over the past 30 days, the average sea temperature in Poipu Beach has been 26.9°C.
Monthly Water Temperature Averages
Northern Hemisphere. Summer is generally June–August; winter is December–February.
| 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 | 27.1°C / 80.9°F | 27.7°C / 81.9°F |
Profile calculated from 1160 hourly forecast records across 3 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 sea temperature in Poipu Beach today?
The current sea surface temperature in Poipu Beach is 27.4°C. Over the last 30 days, the average has been 26.9°C.
When is the water warmest in Poipu Beach?
The warmest monthly average in the Poipu Beach archive is August, at around 27.1°C (80.9°F).
When is the water coldest in Poipu Beach?
The coldest monthly average in the archive is June, at around 26.1°C (79.0°F).
Can you swim in Poipu Beach today?
At 27.4°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 Poipu Beach.
View Snorkel Forecast →