Bill Greene/Globe Staff
The 121st running of the Boston Marathon will take place with generally great weather for both runners and spectators. It won’t be cold and damp, nor will it be hot and humid, both of which have happened in the past.
This year, after a very warm Easter Sunday, cooler air from Canada will arrive for the marathon. If you are getting up early to help a runner to the race, expect temperatures in the upper 50s — not too chilly even at sunrise.
Temperatures will start at about 62 degrees for the race and then increase to about 70 by noon to 1 p.m. (Imagine watching the first half of the race back in 1976, when it was in the 90s, or standing along the route in the 50-degree weather and torrential rain in 2007.)
Runners might think weather in the 60s is too warm for a marathon. While that’s probably true, the relative humidity is going to be very low. This is important because it will help wick the sweat off your body and cool you down. This also mean water loss will be high, so be sure to use those water stations.
Winds are going to be favorable for runners this year. I expect we might even see a record or two fall because of the northwest wind. The wind direction isn’t exactly perfect, but it’s pretty close. While there’s often a head wind for runners as they pass Newton and head into Boston, this year the wind will be at participants’ backs the entire way. The wind will be consistent and help guide them to the finish line.
Of course, the same weather runners and spectators will enjoy will also overlook Fenway Park during the traditional Patriots’ Day game. Other celebrations taking place during the day can count on cooperation from Mother Nature as well.
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