Castillo De San Marcos National Monument - Climate

Castillo de San Marcos National Historic Monument by National Parks Service

Summers (May through September) can be very hot and bright with high humidity. Afternoon thundershowers are highly possible. We suggest you have some kind of sun protection, including sunscreen and UV protective sunglasses. Winters (December through March) can be cooler than one would expect, and sudden cold snaps should be taken into consideration. Spring (mid-march-mid-May) and fall (October-November) can be quite pleasant with temperatures in the 70s-80s.