Boston Marathon participants will have partly sunny, mild day for running

Boston Marathon weather forecast for Monday sounds glorious for spectators, but it may be too hot for runners. The weather forecast will be warm, but how hot is too hot to run? The Boston Marathon will be held on Monday morning at 7:30 p.m. ET.

Boston Marathon participants to have partly sunny, mild day for running. Monday is the 128th Boston Marathon and runners will have a mild, mostly clear day ahead of them. Monday will be a partly sunny and mild day, with a milder wind and rain. Boston Marathon will take place on Monday morning at 6:30 p.m.

High temperatures could put Boston Marathon runners at risk for hyperthermia. The Boston Marathon weather forecast for Monday sounds glorious for spectators, but it may be too hot for runners. WBZ-TV's Dr. Mallika Marshall: "The Boston Marathon is a great race for spectators"