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Boston Weather: 38.0°F | A Few Clouds

Weather: Improving Weekend

By Bill Ramstrom

STAFF METEROLOGIST --

A large upper-level trough will dominate the weather over the eastern United States for most of the upcoming weekend. This will keep cool, Canadian air in place in our area, with off-and-on clouds and a chance for rain showers. A large, slow-moving storm system located in the midwest will creep northeastward into Ontario by Saturday, and begin to dissipate. Another storm will be forming to our south over the Atlantic, drawing the energy away from the original system. This storm will move rapidly east-northeastward, just brushing southern New England with rain showers today and this evening. For Saturday, the main storm center over Canada will lead to a mostly cloudy day with a few rain showers possible. The weather will begin to improve by Sunday, with just some clouds, but no rain.

For the marathon on Monday, cool air and a bit of a westerly tailwind should help runners to have a fast day. Temperatures will be in the low to mid 50s at the start of the race in Hopkinton at noon, and the mid to upper 50s in Boston by the time finishers are comfortable.

Today: Cloudy and chilly with a few periods of light rain. High 48°F (9°C).

Tonight: Continued cool and damp with a few showers. Low 43°F (6°C).

Saturday: Mostly cloudy. Chance for afternoon shower. High 50°F (10°C).

Saturday Night: Some clouds. Low 44°F (7°C).

Sunday: More sun and a bit warmer. High 53°F (12°C).

Outlook for Monday and Tuesday: Mostly sunny and seasonable. Highs upper 50s (13-15°C).