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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 6.5–16.8°C, 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 21.2–24.4°C, 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 19.0–7.9°C, 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 2.7–3.1°C, 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. 12.5°C / Annual rainfall: approx. 1380 mm / Summer humidity: 65%–75% / Rainiest month: September

Chester County monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
1°C
117
February
3.1°C
56.1
March
6.5°C
111.9
April
11.8°C
140.5
May
16.8°C
88.5
June
21.2°C
131.9
July
24.4°C
134.5
August
22.9°C
102.2
September
19°C
175.5
October
13.2°C
85.1
November
7.9°C
72.1
December
2.7°C
164.7

Chester County weather for the next seven days

5/4
Monday
Sunny
24.8°C/5.9°C
5/5
Tuesday
Patchy rain nearby
24.3°C/11.7°C
5/6
Wednesday
Moderate rain
17.2°C/13.2°C
5/7
Thursday
Moderate rain
9.7°C/6°C
5/8
Friday
Sunny
15°C/3.4°C
5/9
Saturday
Patchy rain nearby
14.6°C/9.3°C
5/10
Sunday
Sunny
19.2°C/6°C