Boston Harbor Island State Park, MA 7-Day Weather Forecast

Boston Harbor Island State Park Weather Forecast

Boston Harbor Island State Park, MA Weather Forecast Date: 105 PM EDT Thu Mar 12 2026

Weather forecast for Boston Harbor Island State Park, MA

Today Hi: 55°FHi: 13°C Lo: 30°F Lo: -1°C	This Afternoon... Rain and snow likely. Little or no snow accumulation. Highs in the mid 50s. Temperature falling into the mid 30s late. Northwest winds 10 to 15 mph with gusts up to 30 mph. Chance of precipitation 70%.
Fri Hi: 40°FHi: 4°C Lo: 35°F Lo: 2°C	Friday... Sunny in the morning, then becoming mostly cloudy. Much cooler with highs around 40. West winds 5 to 10 mph, becoming south with gusts up to 25 mph in the afternoon.
Sat Hi: 49°FHi: 9°C Lo: 30°F Lo: -1°C	Saturday... Mostly sunny. Highs in the upper 40s. West winds 15 to 20 mph with gusts up to 45 mph.
Sun Hi: 45°FHi: 7°C Lo: 39°F Lo: 4°C	Sunday... Mostly cloudy. Highs in the mid 40s.
Mon Hi: 61°FHi: 16°C Lo: 39°F Lo: 4°C	Monday... Rain, breezy. Highs in the lower 60s. Lows in the upper 30s. Chance of rain 90%.
Tue Hi: 45°FHi: 7°C Lo: 25°F Lo: -4°C	Tuesday... Partly sunny with a 40% chance of rain. Much cooler with highs in the mid 40s.
Wed Hi: 39°FHi: 4°C	Wednesday... Mostly sunny. Highs in the upper 30s.