Metro

Thunderstorms possible after day of record heat

Wednesday will be mostly sunny, but forecasters have also issued a “hazardous weather outlook” for most of the state.
Barry Chin/Globe Staff
Wednesday will be mostly sunny, but forecasters have also issued a “hazardous weather outlook” for most of the state.

A wet weather system is moving toward the Boston area on Wednesday afternoon as cooler air moves into the region following some record-breaking heat.

The National Weather Service said the rain will be relatively light, though “an isolated rumble of thunder cannot be ruled out.” However, the afternoon will be a contrast to Tuesday, when Boston saw its all-time high temperature for the date at 84 degrees.

Temperatures have peaked for the day in Eastern Massachusetts, mostly in the 60s, and the temperature is likely to fall along with the rain. The precipitation will trail off by late evening, and overnight lows are set to hit 45 degrees in Boston.

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Thursday is expected to be in the 60s again, and dry and sunny weather with high temperatures ranging from the 50s and 70s is expected to last into the weekend.

John R. Ellement can be reached at ellement@globe.com. Follow him on Twitter @JREbosglobe.Andy Rosen can be reached at andrew.rosen@globe.com. Follow him on Twitter at @andyrosen.