National Weather Service Forecast for: Upper Darby 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 3am. Some of the storms could produce heavy rainfall. Patchy fog after 5am. Low around 68. 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
and Patchy
Fog
 Sunday

Sunday: Showers and thunderstorms, mainly before 10am. Some of the storms could produce heavy rainfall. Patchy fog before 8am. High near 83. Calm wind becoming northwest 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: Partly cloudy, with a low around 68. Calm wind becoming west around 5 mph after midnight.
Partly Cloudy

 Monday

Monday: Mostly sunny, with a high near 75. North wind 10 to 15 mph.
Mostly Sunny

 Monday
Night
Monday Night: Mostly clear, with a low around 54. North wind 5 to 10 mph.
Mostly Clear

 Tuesday

Tuesday: Sunny, with a high near 76.
Sunny

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 58.
Mostly Clear

 Wednesday

Wednesday: Sunny, with a high near 82.
Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 62.
Mostly Clear
Lo 68 °F Hi 83 °F Lo 68 °F Hi 75 °F Lo 54 °F Hi 76 °F Lo 58 °F Hi 82 °F Lo 62 °F

Flood Watch
 

Overnight
 
 A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Some of the storms could produce heavy rainfall. Patchy fog after 5am. Low around 68. 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 thunderstorms, mainly before 10am. Some of the storms could produce heavy rainfall. Patchy fog before 8am. High near 83. Calm wind becoming northwest 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
 
 Partly cloudy, with a low around 68. Calm wind becoming west around 5 mph after midnight.
Monday
 
 Mostly sunny, with a high near 75. North wind 10 to 15 mph.
Monday Night
 
 Mostly clear, with a low around 54. North wind 5 to 10 mph.
Tuesday
 
 Sunny, with a high near 76.
Tuesday Night
 
 Mostly clear, with a low around 58.
Wednesday
 
 Sunny, with a high near 82.
Wednesday Night
 
 Mostly clear, with a low around 62.
Thursday
 
 Sunny, with a high near 85.
Thursday Night
 
 Partly cloudy, with a low around 65.
Friday
 
 Mostly sunny, with a high near 83.
Friday Night
 
 A chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 30%.
Saturday
 
 Partly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Upper Darby PA.