Mustang Island Water Temperature & Swim Forecast
Popular Texas beach near Port Aransas.
Very warm water with a light chop and a light breeze — great swimming conditions.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Mustang Island on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
No wetsuit
At 28.8°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Recommendation tuned for Mustang Island's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Mustang Island swimming conditions summary
- Water temperature
- 28.8°C
- Water feels
- Bath-warm
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 87/100 · Excellent
- Wetsuit needed
- No wetsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 29.0 °C
- Warmest months to swim
- June, July, August
At 28.8°C the water is warm enough to swim and surf in just a swimsuit or boardshorts. Model estimate. Water, wave, wind and UV values are Open-Meteo marine/weather model estimates, refreshed hourly — not buoy measurements.
Frequently asked questions
Can I swim at Mustang Island right now?
The sea at Mustang Island is currently 28.8°C — excellent swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.
What will the sea temperature be at Mustang Island next week?
Based on long-term September averages and the latest marine model, expect the sea around Mustang Island to sit close to 26.9°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Mustang Island?
June – July – August are typically the warmest months to swim at Mustang Island, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Mustang Island?
With water currently at 28.8°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.
Can I swim at Mustang Island today?
The sea is currently 28.8°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • Located in Texas, United States (Gulf of Mexico).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Mustang Island
The sea in Mustang Island peaks in July, when the water averages around 30°C.
The main swimming season runs from April – November, when surface temperatures stay comfortable for extended sessions.
On average, 8 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like March and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 19°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically January at around 16°C, when cold-water swimmers dominate the coast.
Mustang Island sea temperature history
Long-term climatology for Mustang Island shows an annual mean sea temperature of 24°C, ranging from 16°C in winter to 30°C at the summer peak.
The seasonal swing is roughly 14°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Mustang Island, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Mustang Island sea temperature: frequently asked questions
What is the warmest month to swim in Mustang Island?
July is the warmest month in Mustang Island, when the sea averages about 30°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Mustang Island?
The coldest month in Mustang Island is typically January, when the water averages around 16°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Mustang Island without a wetsuit?
The main swimming season in Mustang Island runs from April – November — about 8 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Mustang Island?
Outside peak summer the water in Mustang Island drops toward 19°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Mustang Island?
The long-term annual mean sea temperature in Mustang Island is about 24°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Mustang Island?
The live reading at the top of this page shows the current sea temperature in Mustang Island, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Apr – May – Jun – Jul – Aug – Sep – Oct – Nov
| Month | Sea | Comfort |
|---|---|---|
| Jan | 16°C | Bracing |
| Feb | 16°C | Bracing |
| Mar | 19°C | Pleasant |
| Apr | 23°C | Warm |
| May | 26°C | Hot |
| Jun | 29°C | Hot |
| Jul ⭐ | 30°C | Hot |
| Aug | 30°C | Hot |
| Sep | 29°C | Hot |
| Oct | 26°C | Hot |
| Nov | 21°C | Pleasant |
| Dec | 18°C | Pleasant |
Nearby beaches
The closest coastline, with live water temperatures.