Runners and spectators can expect slightly cooler temperatures, likely in the mid to upper 50s, at the start in Hopkinton.

Here's what we know about the conditions for runners and spectators on Monday during the 129th Boston Marathon.

We have a great forecast for Marathon Monday! It will be cool as runner line up at the start line in Hopkinton with 40s to low 50s in Hopkinton. At the finish line in Boston, it will range from the mid 50s to 60 degrees.