Biscayne's most pressing hazard is its storm activity, with 12 thunderstorm wind events recorded alongside 9 floods, 3 tornadoes, and 2 flash floods — a pattern that makes fast-moving weather the defining risk for anyone spending time on or near the water here. Because most of the park is aquatic, storms that might be a nuisance on land become genuinely dangerous when you're in a kayak or on a boat miles from shore. Miami-Dade County also logged a violent crime rate of 286.7 per 100,000 in 2023, so awareness at park access points and parking areas matters too.
Before launching any watercraft, download a marine weather app like NOAA Weather Radar and set it to alert you when thunderstorms are within 20 miles — afternoon build-ups here move fast. Carry a handheld VHF radio so you can reach the Coast Guard if cell service drops over open water. At campsites, store valuables locked in your vehicle rather than visible in a tent or on a picnic table, particularly at trailhead parking areas.
Top recorded hazards in Miami-Dade County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Thunderstorm Wind 12
- Flood 9
- Hail 3
- Tornado 3
- Flash Flood 2
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About Biscayne National Park
Within sight of Miami, yet worlds away, Biscayne protects a rare combination of aquamarine waters, emerald islands, and fish-bejeweled coral reefs. Evidence of 10,000 years of human history is here too; from prehistoric tribes to shipwrecks, and pineapple farmers to presidents. For many, the park is a boating, fishing, and diving destination, while others enjoy a warm breeze and peaceful scenery.
Weather
The park is situated in a subtropical climate, which ensures sunshine year-round. Winters are normally dry and mild, with occasional fronts bringing wind and little rain. Summer brings hot and humid weather with scattered thunderstorms in the afternoons. The average temperature in January is 68 degrees Fahrenheit and 82 in July. The average rainfall for the area is 2.17 inches in January and 3.95 inches in July. June to November is hurricane season.