Boston weather in January
Long-run climate averages for Boston, MA in January, plus what the forecast models say for the days ahead.
In January, Boston averages 40°F by day and 27°F at night. It is the wettest month of the year here.
January in Boston averages a daytime high of 40°F and an overnight low of 27°F, which reads as cool for this part of the world. It is the coldest month of the year here. It is also the wettest month, so build rain into any plan. Overnight temperatures drop below freezing, so expect frost and pack accordingly. Across the whole year Boston sees roughly 51 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live Boston forecast with every model compared and how much they currently agree.
Boston weather by month
what to expect in Boston through the yearHere is Boston's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Boston by season.