Chilly, Overcast Conditions Mark BAA 5K Day

Cool air moved into the Boston area on Saturday, leaving dry skies for much of the day. A wetter system will arrive Sunday and affect plans across New England.

Weekend outlook

Saturday will be cooler than normal with partial sunshine. Highs near 54 degrees in many locations.

Sunday brings steady rain from morning into evening. Some periods of heavy rain are possible, especially north and west of I-95.

Rain, timing and impacts

Rain is expected to begin around 8 a.m. Sunday in many spots. Precipitation should persist through the afternoon and taper near sunset.

Embedded downpours and isolated thunder are possible northwest of Boston. Up to three quarters of an inch of rain may fall in the heaviest areas.

Higher elevations could see wet snow mixing in during the evening. The Berkshires and ski country are most at risk for brief snow totals.

Marathon Monday conditions

The 130th Boston Marathon will start dry and bright at 9 a.m. on Monday. Temperatures will sit in the 40s at the start.

Clouds will increase through the day, with overcast skies by late afternoon. A stiff wind will make conditions feel chillier despite a tailwind for parts of the course.

Chilly, Overcast Conditions Mark BAA 5K Day and set a similar tone for marathon morning. Runners generally favor cooler temperatures in the 45–50 range.

Local details and temperatures

Morning readings included Boston at about 49 degrees and Portsmouth near 43. Most of eastern Massachusetts will struggle to reach 50 degrees on Saturday.

Warmer air remains west of the region. Western Massachusetts, western Connecticut, Vermont, and parts of New York could reach the 60s.

Low stratus and marine fog are moving onshore. Fog should thin by late morning, but areas of fog overnight remain possible.

Seven-day snapshot

Filmogaz.com advises spectators and participants to plan for wet weather Sunday. Dress in layers for Monday and expect breezy, chilly conditions on race day.