Historical weather data, all-time temperature records, and monthly climate averages for Westport, CT. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Westport sits right in that awkward shoulder season — historically, highs average 56° but have swung anywhere from a bitter 21° in 1962 to a shirt-sleeve 73° in 2010. There's a coin-flip chance of rain today (52% historically), though snow is nearly off the table at just 2%.
Westport's weather has real teeth at the extremes — the thermometer has soared to 104° in August 2001 and bottomed out at a brutal -18° in January 1961, a spread of 122 degrees. A single June day in 1972 dumped 6.12 inches of rain, and a February 2003 snowstorm buried the town under 18 inches.
Summer is Westport's sweet spot, with the warmest week of the year (July 16–22) averaging a high of 86° — perfect for the beach. Winters are cold but not punishing, with January highs barely cracking 38°. If you're avoiding rain, steer clear of late May through early June, which is historically the wettest stretch of the year.