Heavy rain is the defining hazard at Fort Matanzas, with 9 recorded heavy-rain events in St. Johns County driving a pattern of flooding and thunderstorm wind that shows up repeatedly in the data — including 2 flood events, 2 flash floods, and 7 thunderstorm wind incidents. The monument sits on a narrow barrier island accessed by ferry, which means fast-moving storms can strand visitors on either side of the Matanzas River with little warning.
Check the National Weather Service forecast each morning before boarding the ferry, and watch the western sky for anvil-shaped storm clouds that signal squall-line activity common to coastal Florida. Pack a waterproof dry bag for phones, wallets, and any documents, since flash flooding can quickly swamp low-lying boardwalks and parking areas. If thunder is audible, move away from the open riverbank and shelter in the visitor center rather than under trees or boat docks.
Top recorded hazards in St. Johns County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Heavy Rain 9
- Thunderstorm Wind 7
- Flood 2
- Tornado 2
- Flash Flood 2
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About Fort Matanzas National Monument
Fort Matanzas National Monument preserves the fortified coquina watchtower, completed in 1742, which defended the southern approach to the Spanish military settlement of St. Augustine. It also protects approximately 300 acres of Florida coastal environment containing dunes, marsh, maritime forest, and associated flora and fauna, including threatened and endangered species.
Weather
Summers are hot and humid with afternoon thundershowers. Sunscreen, a hat, UV protective sunglasses, and are recommended. Drink plenty of water. Winters are cool to mild with some cold spells, especially with wind from the north or off the water. Fall and spring are temperate with temperatures around 70F-80F (21C-26C). During danger of lightning, the fort will be closed and ferry service will be suspended. June-November is hurricane season so check for tropical storms before visiting.