Historical weather data, all-time temperature records, and monthly climate averages for Willimantic, CT. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Willimantic is a coin flip for rain — historically, there's a 52% chance of precipitation on this date. Temperatures tend to sit in that awkward in-between zone, with an average high of 53° and low of 35°, though the date has seen everything from a balmy 75° in 2010 to a bitter 23° as recently as 2021.
Willimantic's weather has real range — from a scorching 101° on August 9, 2001 to a brutal -16° on February 21, 2015, that's a 117-degree spread over 30 years of records. The wettest single day on record dumped 4.58 inches on September 25, 2018, a reminder that late-season storms here can punch hard.
Summer is the sweet spot, with mid-July highs averaging 85° — peak comfort for outdoor plans. January and February are the deep freeze, with average highs barely cracking the mid-30s. If you're watching for rain, late September is historically the wettest stretch of the year.