Historical weather data, all-time temperature records, and monthly climate averages for Greenwich, CT. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Greenwich runs cool, with an average high of 54° and low of 37° across 80 years of records. The date has seen wild swings though — a balmy 76° in 1967 and a brutal 18° low back in 1954. There's nearly a coin-flip chance of rain today (44%), with a small but real 6% chance of snow still lurking.
Greenwich weather has real teeth at the extremes — from a scorching 102° on July 4th, 1966, to a bone-chilling -10° on January 22nd, 1961, a spread of 112 degrees. A single storm dropped 6.82 inches of rain on April 15th, 2007, and a February 1969 snowstorm buried the area under 20 inches in one day.
Summer is the sweet spot, peaking the week of July 16–22 with average highs of 84°, while mid-January bottoms out around 34°. Spring arrives gradually — highs climb from 47° in March to 59° in April and 69° in May. If you're planning around rain, note that early April is actually Greenwich's wettest stretch of the year, averaging 1.24 inches per week.