Temperatures are expected to start out in the 40s for the marathon’s military march at 6 a.m. A group of professional men and women is slated to start between 9 a.m. and 10 a.m., with all participating categories underway by around 11:15 a.

On Monday, over 30,000 runners will gather to take part in one of the most prestigious races in the United States. The 2025 Boston Marathon kicks off early, with events starting at 6 a.m. ET. Monday will mark the 129th running of the Boston Marathon.

StormTeam 5's forecast is tracking the conditions for the big race. Here's what athletes and spectators will want to know.