After a bright and coolish Sunday, we’d love to have that weather spill over into Marathon Monday, however, we just can’t manage to do that.  

Rain is racing in from the west this morning, getting ready to settle in for 26.2 mile journey from Hopkinton to Boston. Light rain likely breaks out in Hopkinton around 9:00AM and in Boston by 11:00 AM.  Rain will increase in intensity late morning/early afternoon from west to east, with the steadiest and heaviest rain moving in around the Noon – 2:00 PM time frame and sticking around through the rest of the afternoon and early this evening.  Winds are light this morning, but steadily increase out of the east to 10-20mph (strongest near the coast), ensuring a head wind for the runners, as that cool onshore flow holds temps in the 40s through the afternoon. If you’re heading to Fenway, bring the rain gear and plan on temps holding in the 40s. 

Steady rain breaks apart to scattered showers and even a few embedded thunderstorms overnight tonight as temps sneak into the lower 50s by daybreak tomorrow.  In total, most areas pick up an 1-1.5″ of rain from this event by the time showers wrap up tomorrow morning.   

Tomorrow afternoon is likely the warmest we see all week, with highs in the 60s and even a few breaks of sun in the afternoon. 

While I don’t see any more mild air this week, I don’t see any washouts either.  Temps generally run a bit cool, in the mid 50s with an occasional passing shower from Wednesday, into next weekend, as cool air aloft allows enough instability for any morning sun to fade to building clouds and that pop-up shower once and a while in the afternoon. 

Try to stay warm and dry today, and good luck to all you runners!  

@clamberton7 – twitter 

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