Historical weather data, all-time temperature records, and monthly climate averages for Chester, PA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Chester lands right in that shoulder-season sweet spot, with an average high of 59° and low of 40° across 85 years of records. The date has a 55-degree swing in its history — from a frosty 26° in 1965 to a shirt-sleeve 81° back in 1942. Snow is essentially off the table at just a 1% chance, though there's about a 1-in-3 shot at some rain.
Chester's weather has real range — 111 degrees separating its all-time extremes of 104° (July 3, 1966) and -7° (January 17, 1982). When it rains hard here, it can really rain: a single day in July 2013 dumped 8.02 inches, and a January 1996 storm buried the area under 27.6 inches of snow.
Summer is the main event in Chester, with highs peaking around 87-88° in mid-July and a soggy stretch in early-to-mid July averaging over an inch of precip per week. Winters are cold but not brutal, with January highs hovering around 39-40°. Spring arrives quickly through April and May, making those months a pleasant window before summer heat and humidity settle in.