From the National Weather Service:
Low pressure and an associated front will bring showers across the region today. With cool east to southeast winds, temperatures will run 5 to 10 degrees below normal. Conditions will improve across most areas on Saturday, except a few showers may linger across outer Cape Cod and Nantucket. Expect milder temperatures as readings top off in the 60s to near 70s, except holding in the 50s along the immediate east coast.