Boston Harbor Islands, MA
Today’s Forecast:
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Today’s Report:
Boating
Not Recommended for boating. High near 46°F. Low rain risk (3%). Breezy winds (12 mph). Temperatures outside comfort limits (46°F).
- Temp: Unfavorable weather factor
- Rain: Favorable conditions
- Wind: Marginal weather factor
- Thunderstorm: Favorable conditions
Paddling
Not Recommended for paddling. High near 46°F. Low rain risk (3%). Breezy winds (12 mph). Temperatures outside comfort limits (46°F).
- Temp: Unfavorable weather factor
- Rain: Favorable conditions
- Wind: Marginal weather factor
- Thunderstorm: Favorable conditions
Fishing
Good for fishing. High near 46°F. Low rain risk (3%). Breezy winds (12 mph).
- Temp: Marginal weather factor
- Rain: Favorable conditions
- Wind: Marginal weather factor
- Thunderstorm: Favorable conditions
Camping
Excellent for camping. High near 46°F. Low rain risk (3%). Light wind (12 mph).
- Temp: Marginal weather factor
- Rain: Favorable conditions
- Wind: Favorable conditions
- Thunderstorm: Favorable conditions
Hiking
Good for hiking. High near 46°F. Low rain risk (3%). Light wind (12 mph).
- Temp: Marginal weather factor
- Rain: Favorable conditions
- Wind: Favorable conditions
- Thunderstorm: Favorable conditions
About Boston Harbor Islands
The representative forecast point covers the main visitor approach, but conditions can differ across water, shorelines, forest interiors, distant access points. Important decisions involve ferry schedules, harbor wind and chop, fog, tides, cold water, island camping and limited shelter.
Planning an Outing at Boston Harbor Islands
Check the exact marina or authorized launch, paddling access, fishing access, campground, trail notice that applies to the chosen activity. The observation near Boston should not be treated as proof of conditions across the entire coverage area.
Weather Tips for Boston Harbor Islands
- Leave open water, shorelines when thunder is heard.
- Check wind, visibility, access and seasonal operations shortly before departure.
- Carry layers, sun protection and enough water for humidity, wind and rapid temperature changes.
- Follow official closures, wildlife restrictions and emergency instructions.
Nearby Towns and Areas
Use this forecast as practical context for plans near:
- Boston
- Hingham
- Hull
- Georges Island
- Spectacle Island
- Peddocks Island
Adjust the Day to the Forecast
When ferry or small-craft conditions worsen, replace the island trip with a mainland harborwalk; once transported offshore, sheltered alternatives and return schedules are limited.
7-Day Forecast for Boston Harbor Islands
Boston Harbor Islands Weather by Season
Winter
Public ferry and camping service is generally absent or sharply reduced, while exposed islands face cold wind and freezing spray.
Spring
Ferry schedules resume unevenly as fog, cold water and unsettled seas continue to limit access.
Summer
Heat and lightning are amplified by limited shelter; harbor chop can rise quickly under thunderstorm outflow.
Fall
Warm water lingers, but tropical remnants and nor’easters can cancel ferries and flood docks before cooler air arrives.
Key Climate Data Points
- Local climate: Boston Harbor marine climate; annual mean temperature near 51–53°F; about 44–48 inches precipitation; roughly 35–50 inches snow; primary ferry/camping season late spring through early fall.
- Warmest period: Mainland heat peaks in July, but harbor breezes and cold water can lower island temperatures and add wind chill.
- Coolest period: January is coldest, with limited ferry service and variable snow or ice on exposed docks.
- Primary storm or hazard season: Fog, thunderstorms, nor’easters and tropical systems can suspend ferries and produce rough harbor conditions or coastal flooding.
- Best general outdoor window: June through September offers the broadest ferry schedule, although morning fog and afternoon storms still require same-day checks.