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Chester County, PA Weather Tomorrow

From tomorrow through the next 5 days, stay updated on Chester County weather with precipitation chances, day and night conditions, high and low temperatures in Fahrenheit and Celsius, sunrise, sunset, sky conditions, wind chill, and wind speed with direction for the Chester County area.
Updated: Thu Sep 3rd 2026 10:30 PM EDT
Chester County, PA Weather – 9-3 – Scattered Showers
88° / 68°
Scattered Showers
On and off showers are set to occur in Chester County, with a high of 88°F and a low of 68°F. The chance of rain is 88% with an estimated 4.69in. Wind will be moderate, blowing around 12mph on average and gusts of 15.9mph at 11 PM. High humidity with average of 85% is anticipated, the maximum being 87% at 11 PM and 87% being its lowest at 11 PM. Barometric pressure is its highest of 29.94inHg at 11 PM, a lowest point of 29.94inHg at 11 PM with an avg 29.94inHg.
Chester County, PA Weather – 9-4 – Sunny
84° / 68°

Weather Tomorrow

Sunny
In Chester County, a sunny day is likely with a high near 84°F and a low around 68°F. The chance of rain is 80% with an estimated 4.72in. Wind will be moderate, blowing around 13mph on average and gusts of 33.1mph at 1 AM. The humidity will be on the higher side, averaging about 78%, the maximum being 94% at 6 AM and 56% being its lowest at 3 PM. Barometric pressure is its highest of 29.97inHg at 1 AM, a lowest point of 29.84inHg at 5 PM with an avg 29.9inHg.
Chester County, PA Weather – 9-5 – Overcast
79° / 66°
Overcast
Daytime highs will reach 79°F with lows dropping to 66°F in Chester County, where skies will be overcast. There might be light rainfall having a 11% chance. Winds will be light at 7mph and gusts of 21.3mph at 11 PM. The humidity will be on the higher side, averaging about 68%, the maximum being 85% at 12 AM and 52% being its lowest at 1 PM. Barometric pressure is its highest of 29.9inHg at 12 AM, a lowest point of 29.79inHg at 6 PM with an avg 29.86inHg.
Chester County, PA Weather – 9-6 – Sunny
73° / 61°
Sunny
In Chester County, sunshine is likely with a high near 73°F and a low around 61°F. There might be light rainfall having a 21% chance with an estimated 0.01in. Wind will be moderate, blowing around 11mph on average and gusts of 20.6mph at 8 AM. The humidity will be on the higher side, averaging about 71%, the maximum being 88% at 11 PM and 55% being its lowest at 4 PM. Barometric pressure is its highest of 30.08inHg at 10 PM, a lowest point of 29.87inHg at 1 AM with an avg 29.96inHg.
Chester County, PA Weather – 9-7 – Sunny
75° / 59°
Sunny
A sunny day is in the forecast for Chester County, with a high of 75°F and a low of 59°F. There's a very small chance of rainfall, only about 7% with an estimated 0in. Winds will be light at 8mph and gusts of 13.2mph at 2 AM. The humidity will be on the higher side, averaging about 65%, the maximum being 92% at 7 AM and 40% being its lowest at 4 PM. Barometric pressure is its highest of 30.18inHg at 11 AM, a lowest point of 30.09inHg at 12 AM with an avg 30.14inHg.
Chester County, PA Weather – 9-8 – Overcast
77° / 59°
Overcast
In Chester County, skies will be overcast with highs near 77°F and lows around 59°F. There's a very small chance of rainfall, only about 9%. Winds will be light at 6mph and gusts of 15.4mph at 5 AM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 64% at 8 AM and 40% being its lowest at 2 PM. Barometric pressure is its highest of 30.21inHg at 9 AM, a lowest point of 30.16inHg at 5 PM with an avg 30.18inHg.

Currently

Patchy Rain Nearby 74°F
29.92 inHg.
Barometer
87%
Humidity
WNW 6.1 mph
Wind
Patchy Rain Nearby

5 Day Forecast Nearby

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