National Weather Service Forecast for: Chester PA
Issued by: National Weather Service Philadelphia, PA
Updated: 4:09 pm EDT Sep 12, 2026
 
Overnight

Overnight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rainfall. Low around 70. Southeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Heavy Rain

 Sunday

Sunday: Showers and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms between 8am and 11am. Some of the storms could produce heavy rainfall. Patchy fog between 7am and 9am. High near 84. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Heavy Rain
and Patchy
Fog then
Mostly Sunny
 Sunday
Night
Sunday Night: Increasing clouds, with a low around 69. Calm wind becoming west around 5 mph after midnight.
Increasing
Clouds

 Monday

Monday: Mostly sunny, with a high near 76. North wind 10 to 15 mph.
Mostly Sunny

 Monday
Night
Monday Night: Mostly clear, with a low around 55. North wind 5 to 10 mph.
Mostly Clear

 Tuesday

Tuesday: Sunny, with a high near 77.
Sunny

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 59.
Mostly Clear

 Wednesday

Wednesday: Sunny, with a high near 81.
Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 63.
Mostly Clear
Lo 70 °F Hi 84 °F Lo 69 °F Hi 76 °F Lo 55 °F Hi 77 °F Lo 59 °F Hi 81 °F Lo 63 °F

Flood Watch
 

Overnight
 
 A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rainfall. Low around 70. Southeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
 
 Showers and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms between 8am and 11am. Some of the storms could produce heavy rainfall. Patchy fog between 7am and 9am. High near 84. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
 
 Increasing clouds, with a low around 69. Calm wind becoming west around 5 mph after midnight.
Monday
 
 Mostly sunny, with a high near 76. North wind 10 to 15 mph.
Monday Night
 
 Mostly clear, with a low around 55. North wind 5 to 10 mph.
Tuesday
 
 Sunny, with a high near 77.
Tuesday Night
 
 Mostly clear, with a low around 59.
Wednesday
 
 Sunny, with a high near 81.
Wednesday Night
 
 Mostly clear, with a low around 63.
Thursday
 
 Sunny, with a high near 84.
Thursday Night
 
 Mostly clear, with a low around 66.
Friday
 
 Mostly sunny, with a high near 84.
Friday Night
 
 A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Saturday
 
 Partly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Chester PA.