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Chester County

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Chester County Weather, Climate and Best Time to Visit

Data source:Meteostat
Update date:2025-09

Chester County year round climate

  • Spring (March–May): Average 43–62°F, the climate gradually changes from cold to warm, with abundant rainfall, especially in April. Common activities: picnics, flower viewing, outdoor hiking. Recommended clothing: light jacket, long-sleeved shirt, comfortable shoes.
  • Summer (June–August): Average 70–75°F, hot and humid weather, relatively stable rainfall. Common activities: swimming, camping, outdoor barbecues. Recommended clothing: light and breathable clothing, sun hat, sunscreen.
  • Autumn (September–November): Average 66–46°F, the temperature changes from warm to cool, September has the most rainfall, then gradually becomes drier. Common activities: maple leaf viewing, fruit picking, outdoor cycling. Recommended clothing: comfortable long-sleeved shirts, light jackets, warm clothing (October–November).
  • Winter (December–February): Average 36–37°F, cold weather, relatively heavy rainfall, occasional snowfall. Common activities: indoor activities, skiing (requires traveling to higher altitudes), appreciating winter scenery. Recommended clothing: heavy coat, warm clothing, scarf, hat, gloves.

Chester County climatological average

Annual average temperature: approx. 54.5°F / Annual rainfall: approx. 1380 mm / Summer humidity: 65%–75% / Rainiest month: September

Chester County monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
33.8°F
117
February
37.6°F
56.1
March
43.7°F
111.9
April
53.2°F
140.5
May
62.2°F
88.5
June
70.2°F
131.9
July
75.9°F
134.5
August
73.2°F
102.2
September
66.2°F
175.5
October
55.8°F
85.1
November
46.2°F
72.1
December
36.9°F
164.7

Chester County weather for the next seven days

12/16
Tuesday
Sunny
31.3°F/15.3°F
12/17
Wednesday
Overcast
38.7°F/23.7°F
12/18
Thursday
Mist
38.8°F/26.6°F
12/19
Friday
Patchy rain nearby
57.3°F/25.5°F
12/20
Saturday
Sunny
33.8°F/23.7°F
12/21
Sunday
Sunny
44.3°F/31.3°F
12/22
Monday
Overcast
33.4°F/26.5°F