Historical weather data, all-time temperature records, and monthly climate averages for Mattapan, MA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Mattapan is classic New England ambiguity — historically, the mercury has swung anywhere from a bitter 17° (1995) to a shirt-sleeve 77° (2010). Expect something closer to the average high of 54° and low of 35°, with about a 4-in-10 shot at rain and a lingering 8% chance of snow.
Mattapan's weather history is a study in extremes: the thermometer has reached a scorching 103° (June 25, 2025) and plunged to -11° (February 4, 2023), a swing of 114 degrees. The all-time wettest day dumped 7.15 inches of rain on June 14, 1998, while the Blizzard of '78 buried the neighborhood under 22 inches in a single day.
Summer is the sweet spot — highs peak around 85-87° in mid-July before easing back through a pleasant fall. If you're avoiding the cold, steer clear of mid-January, when average highs barely crack 35°. Precipitation is fairly consistent year-round, but late summer (early August) is statistically the wettest stretch.