Texas Gulf Coast
South Padre Island Water Temperature
The Lower Laguna Madre's clear flats and the Brazos Santiago jetties.
That is about 4°F warmer than average for this time of year, and holding steady over the last two weeks. The October average here is 82°F.
Updated Saturday, October 3 — sea-surface temperature modeled for South Padre Island by Open-Meteo.
Out in the open Gulf, NOAA buoy 42002 — 211 miles offshore — is reading 87°F. Deep water offshore runs cooler than the shallows in summer and warmer in winter, so it won't match the beach.
For swimming
Very warm
Bath-warm. Pleasant, though it stops being much relief from the heat of the day.
For fishing
Hot — fish the edges of the day
Early and late is the play. Through the middle of the day fish drop into deeper channels and passes where there's moving water and more oxygen.
The last two weeks
Daily average sea-surface temperature, °F.
South Padre Island water temperature by month
Averaged from 3 years of daily sea-surface temperature (2023–2025). The range column is the coolest and warmest daily average recorded in that month over the period — a guide to how much any given year can differ, not a record high and low.
| Month | Average | Range | Swimming |
|---|---|---|---|
| January | 63°F | 57–73°F | Bracing |
| February | 65°F | 61–71°F | Bracing |
| March | 70°F | 65–75°F | Cool but comfortable |
| April | 75°F | 72–80°F | Warm |
| May | 82°F | 76–86°F | Very warm |
| June | 85°F | 83–87°F | Very warm |
| July | 85°F | 83–88°F | Very warm |
| August | 87°F | 85–91°F | Very warm |
| September | 86°F | 83–88°F | Very warm |
| Octobernow | 82°F | 76–87°F | Very warm |
| November | 76°F | 68–81°F | Warm |
| December | 70°F | 62–75°F | Cool but comfortable |
Warmest on average in August at 87°F; coolest in January at 63°F.
The water at South Padre Island
The Lower Laguna Madre is the reason people move to South Padre — a hypersaline, gin-clear, knee-deep lagoon floored with seagrass and pocked with sand holes, about as good a place to sight-cast a redfish as exists in Texas. Trout and reds hold the grass edges and the spoil banks along the Intracoastal, while the Brazos Santiago jetties and the Brownsville Ship Channel pull in tarpon and snook through the warm months — this is far enough south that snook are a real target, not an accident. The same shallow bay flats make the island a kiteboarding destination, and the dunes and boardwalks draw birders straight through migration. Summer heat is serious, and water this skinny means wind and cloud cover matter more than almost anything else.
the lower Laguna Madre & the Gulf
What moves the water temperature here
The Gulf shelf off this coast is shallow, which is why the water swings so much more between summer and winter than open ocean at the same latitude does. Shallow water heats fast and gives that heat up fast: a single strong winter cold front can pull the inshore bays several degrees down in a couple of days, while the beaches a mile offshore barely move. Wind direction matters too — a sustained offshore breeze can pull cooler water up from below and drop the beach temperature noticeably in a morning.
Inshore bays, canals and flats run warmer than the beach through the summer and colder through the winter, for the same reason. The reading above is for the open water at South Padre Island; expect the back bays to be a few degrees either side of it depending on the season.
Common questions
- What is the water temperature at South Padre Island right now?
- The water at South Padre Island is currently about 86°F (30°C). The October average here is 82°F.
- Is the water warm enough to swim at South Padre Island in October?
- October averages 82°F at South Padre Island, which most people would call very warm. Bath-warm. Pleasant, though it stops being much relief from the heat of the day.
- When is the water warmest at South Padre Island?
- August is the warmest month on average at 87°F, and January the coolest at 63°F. 8 months of the year average 75°F or above.
- Why does the water temperature change so quickly here?
- The Gulf shelf off this coast is shallow, so it heats and cools far faster than deep open ocean. A strong winter cold front can pull the inshore water down several degrees in a couple of days, and a sustained offshore wind can drop beach temperatures in a single morning by pulling cooler water up from below.