The Castillo de San Marcos is open to the public seven days per week except Thanksgiving Day (fourth Thursday in November) and Christmas Day (December 25). First admission is at 9:00 a.m. and last admission is at 5:00 p.m. The Castillo closes and visitors must exit at 5:15 p.m. The park grounds are closed from midnight until 5:30 a.m.
Weather and Climate
Summers can be very hot with high humidity and frequent afternoon thundershowers. Sun protection, including sunscreen, a hat, and UV protective sunglasses, is highly recommended. Be sure to drink plenty of water. Winters are generally cool to mild with occasional cold spells, especially with the wind from the north or off the water. The most temperate periods are the fall and spring seasons, when temperatures regularly hover around 70 to 80 degrees Fahrenheit (21 to 26 degrees Celsius).
Last updated: April 27, 2023