Mustang Island Beach Water Temperature
Sea-surface temperature at Mustang Island Beach, Texas · times in CDT
Updated 6:03 AM CDT
How it compares today
Water temperature through the year
Monthly normals computed from 2023–2025 daily sea-surface temperature history.
Nearby water right now
7-day outlook
| Day | Air high / low | Max UV | Rain |
|---|---|---|---|
| Fri, Aug 28 | 90° / 80° | 8 | 8% |
| Sat, Aug 29 | 89° / 80° | 8 | 6% |
| Sun, Aug 30 | 86° / 83° | 8 | 3% |
| Mon, Aug 31 | 86° / 83° | 8 | 2% |
| Tue, Sep 1 | 87° / 83° | 8 | 3% |
| Wed, Sep 2 | 87° / 84° | 8 | 4% |
| Thu, Sep 3 | 87° / 83° | 8 | 7% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is Mustang Island Beach warm enough to swim?
At 86°F, the water at Mustang Island Beach is warm — great for swimming. Most swimmers are comfortable without a wetsuit above 72°F; below 62°F, cold-water shock becomes a real risk for unprotected swimmers.
That is 1° below the August average of 87°F here.
The water averages above 70°F in April, May, June, July, August, September, October and November — 8 months of the year — peaking around 87°F in August and dropping to about 60°F in January.
Frequently asked questions
How warm is the water at Mustang Island Beach right now?
The sea-surface temperature is about 86°F. That is 1° below the August average of 87°F here.
When is the water warm enough to swim at Mustang Island Beach?
The water averages above 70°F in April, May, June, July, August, September, October and November — 8 months of the year — peaking around 87°F in August and dropping to about 60°F in January.
What is the warmest the water gets at Mustang Island Beach?
Around 87°F in August, based on 2023–2025 records. The coolest month is January at roughly 60°F.