Historical weather data, all-time temperature records, and monthly climate averages for Dorchester, MA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Dorchester splits the difference between seasons — historically, highs land around 55° with lows dipping to 35°, but the date has swung from a balmy 78° in 2010 to a bitter 22° in 1993. There's nearly a coin-flip chance of rain (46%), and snow isn't off the table yet at 8%.
Dorchester has seen genuine extremes over its 64 years of records — from a scorching 103° in June 2025 to a brutal -11° in February 2023, a swing of 114 degrees. The wettest single day dropped 7.15 inches in June 1998, and the Blizzard of '78 buried the neighborhood under 22 inches in one shot.
Summer is the sweet spot, with highs peaking around 85-87° in mid-July before easing into a pleasant fall. Winters are genuinely cold — January and February hover in the mid-to-upper 30s — so pack accordingly if you're visiting between December and March. The wettest stretch runs through early August, when weekly rainfall averages top an inch.