Updated October 2026
Gulf Islands National Seashore Weather by Month
Gulf Islands National Seashore is warmest in July, when the nearest NOAA climate station averages a high of 89°F and a low of 74°F, and coldest in January, with an average high of 61°F and an average low of 42°F. September is the wettest month, with about 6.8 inches of precipitation.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 5.5 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Gulf Islands National Seashore can differ from these, particularly with elevation.
Warmest month
Jul
89°F avg high
Coldest month
Jan
42°F avg low
Wettest month
Sep
6.8 in avg
Longest days
Jun
13.9 h of daylight
Average weather at Gulf Islands by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 61°F | 42°F | 4.5 in | 10.2 h |
| February | 64°F | 45°F | 4.0 in | 10.9 h |
| March | 69°F | 50°F | 3.9 in | 11.8 h |
| April | 75°F | 57°F | 5.0 in | 12.7 h |
| May | 82°F | 65°F | 3.2 in | 13.5 h |
| June | 87°F | 72°F | 6.3 in | 13.9 h |
| July | 89°F | 74°F | 6.4 in | 13.8 h |
| August | 89°F | 73°F | 5.7 in | 13.1 h |
| September | 86°F | 70°F | 6.8 in | 12.2 h |
| October | 79°F | 60°F | 4.3 in | 11.2 h |
| November | 70°F | 49°F | 3.8 in | 10.4 h |
| December | 64°F | 45°F | 3.9 in | 10.1 h |
| Year total | 57.8 in |
NOAA 1991–2020 climate normals from station USW00003855, 5.5 miles from the park's reference point. The station's snowfall normal is zero in all twelve months. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Gulf Islands is at that time of year.
Gulf Islands weather by season
Winter: December to February
Average highs bottom out at 61°F in January, between 64°F in December and 64°F in February, with average lows between 42°F and 45°F. Together the three months average 12.4 inches of precipitation, about 21% of the yearly total. Daylight is at its shortest, about 10.1 hours in December.
Spring: March to May
Average highs climb from 69°F in March to 82°F in May, with average lows between 50°F and 65°F. Together the three months average 12.1 inches of precipitation, about 21% of the yearly total and less than in any other season. Daylight lengthens from about 11.8 hours in March to 13.5 in May.
Summer: June to August
Average highs hold near 88°F in all three months, with average lows near 73°F. Together the three months average 18.4 inches of precipitation, about 32% of the yearly total and more than in any other season. Daylight is at its longest, about 13.9 hours in June.
Fall: September to November
Average highs fall from 86°F in September to 70°F in November, with average lows between 49°F and 70°F. Together the three months average 14.9 inches of precipitation, about 26% of the yearly total. Daylight shortens from about 12.2 hours in September to 10.4 in November.
What the National Park Service says about the weather
Weather along the northern coast of the Gulf of Mexico can change quickly. During the winter temperatures range from 30-60 degrees fahrenheit, rain is less common than other seasons. Snow and freezing temperatures are not common. During the summer temperatures range from 70-100+ degrees fahrenheit. Rain is common during the summer with many thunderstorms. Hurricanes impact the area during the tropical storm season between June and November. Tornadoes can impact the area during the Spring and Fall.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Gulf Islands
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 30.32°N, 87.23°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Gulf Islands National Seashore →
Weather and crowds together
July is both the warmest month and the busiest, with about 1.4× the visitors of the park's average month. January is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Gulf Islands National Seashore. For hotels, cabins and rentals close to the park, see where to stay near Gulf Islands.
Where to stay near Gulf Islands
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Top-rated places to stay near Gulf Islands
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Frequently Asked Questions
July is the warmest month at Gulf Islands National Seashore, with an average high of 89°F and an average low of 74°F. That is the 1991–2020 average at the nearest long-record NOAA station, 5.5 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Gulf Islands National Seashore, with an average low of 42°F and an average high of 61°F, based on NOAA 1991–2020 climate normals.
September is the wettest month, with about 6.8 inches of precipitation. May is the driest, at about 3.2 inches. The station records about 57.8 inches of precipitation in an average year.
The nearest long-record NOAA station, 5.5 miles from the park's reference point, shows no measurable snowfall in any month of its 1991–2020 normals.
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00003855), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.