The clearest risk at Boston Harbor Islands isn't what happens on the islands themselves — it's the surrounding county's violent crime rate of 326.6 incidents per 100,000 residents in 2023, which sits meaningfully above national averages. Pair that with 6 recorded thunderstorm wind events in the area, and fast-moving storms over open water become the dominant on-site concern for anyone sleeping on the islands overnight.
When a storm rolls in off the harbor, there's nowhere to quickly retreat — ferries run on fixed schedules, so check NOAA marine forecasts each morning and identify the nearest hard-sided shelter or ranger station on your island before you set up camp. Pack a weather radio or download the NOAA Weather app for real-time alerts, since cell coverage can be patchy on the outer islands. For travel to and from the park, keep valuables locked in your vehicle at the mainland ferry terminals rather than leaving bags visible on seats.
Top recorded hazards in Plymouth County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Thunderstorm Wind 6
- Lightning 1
- Flood 1
- Hail 1
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About Boston Harbor Islands National Recreation Area
. . . where you can walk a Civil War-era fort, view historic lighthouses, explore tide pools, hike lush trails, camp under the stars, or relax while fishing, picnicking, or swimming—all within reach of downtown Boston. Youth programs, visitor services, research, wildlife management, and more are coordinated on the park's 34 islands and peninsulas by the Boston Harbor Islands Partnership.
Weather
The Boston Harbor Islands have a humid maritime climate characterized by slightly cooler temperatures than the mainland, so dress in layers. Typical summer conditions feature air temperatures approximately 5-10 degrees cooler than the mainland, winds of 0-15 knots and waves of 1-3 feet.