Updated October 2026
Mustang Island State Park: Weather by Month and When to Go
Mustang Island State Park is a state park in Texas. The USGS Protected Areas Database maps about 4,800 acres under its name. Average highs range from 63°F in January to 91°F in August.
Average highs sit between 60°F and 80°F in November through April. They run above 80°F in May through October. The figures are NOAA climate normals for 1991–2020, measured at a weather station 1.9 miles from the park.
Warmest average high
91°F
August
Coldest average low
49°F
January
Most precipitation
5.5 in
September
Longest days
13.7 h
June
Mustang Island State Park weather by month
| Month | Average high | Average low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 63°F | 49°F | 2.0 in | 10.4 h |
| February | 66°F | 52°F | 1.6 in | 11.1 h |
| March | 71°F | 57°F | 2.2 in | 11.8 h |
| April | 77°F | 65°F | 2.1 in | 12.7 h |
| May | 83°F | 72°F | 4.4 in | 13.4 h |
| June | 89°F | 77°F | 3.8 in | 13.7 h |
| July | 89°F | 79°F | 2.8 in | 13.6 h |
| August | 91°F | 79°F | 1.9 in | 13.0 h |
| September | 89°F | 75°F | 5.5 in | 12.2 h |
| October | 83°F | 70°F | 3.6 in | 11.3 h |
| November | 73°F | 60°F | 2.4 in | 10.6 h |
| December | 67°F | 52°F | 1.9 in | 10.3 h |
Temperature and precipitation figures are NOAA climate normals for 1991–2020 from station USC00417176, the nearest station with a complete set of temperature normals, 1.9 miles from the park. Conditions in the park can differ from the station's, most of all where the two sit at different elevations. Daylight is calculated for the park's latitude at the middle of each month. The acreage is what the USGS Protected Areas Database maps under the park's name. The state's own figure can differ, because the database may hold part of a park under another name.
What the averages show
- Temperature. August is the warmest month, with an average high of 91°F and an average low of 79°F. January is the coldest month, with an average low of 49°F and an average high of 63°F.
- Precipitation. September is the wettest month, averaging 5.5 inches of precipitation, and February is the driest, at 1.6 inches. An average year brings about 34.2 inches in total.
- Snowfall. The station has no snowfall normal, so snowfall is left out of the table. That is a gap in the station's record, not a sign that it never snows here.
- Daylight. Days run from about 10.3 hours of daylight in December to 13.7 hours in June.
Camping, trails, maps and fees
Whether Mustang Island State Park has camping or cabins, where its trails run, when it opens and what it charges are all published by the agency that runs the park. Its official page is the place to check before a trip.
Official Mustang Island State Park page
For the forecast rather than the averages, the National Weather Service issues a point forecast for the park's location.
National Weather Service forecast for Mustang Island State Park
Where to stay near Mustang Island State Park
Hotels, cabins and vacation rentals near Mustang Island State Park, with live availability and prices.
Top-rated places to stay near Mustang Island State Park
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Frequently Asked Questions
August is the warmest month, with an average high of 91°F and an average low of 79°F. January is the coldest month, with an average low of 49°F and an average high of 63°F. These are NOAA 1991–2020 climate normals from a weather station 1.9 miles from the park.
Average highs sit between 60°F and 80°F in November through April. They run above 80°F in May through October.
September is the wettest month, averaging 5.5 inches of precipitation, and February is the driest, at 1.6 inches. An average year brings about 34.2 inches in total. The station has no snowfall normal, so no snowfall figure is available.
Days run from about 10.3 hours of daylight in December to 13.7 hours in June. The hours are calculated for the park's latitude.
Nearest National Park Service sites
- Padre Island National Seashore45 miles away
- Palo Alto Battlefield National Historical Park116 miles away
- San Antonio Missions National Historical Park136 miles away
Distances are measured in a straight line from the park, so the drive is longer.
Sources: NOAA NCEI U.S. Climate Normals 1991–2020; USGS Protected Areas Database for location and acreage; the official Texas state park listing for the park's name.