National Weather Service Forecast for: Upper Darby PA
Issued by: National Weather Service Philadelphia, PA
Updated: 4:12 am EDT Jun 23, 2025
 
Today

Today: Sunny and hot, with a high near 99. Heat index values as high as 108. Northwest wind around 5 mph.
Hot

 Tonight

Tonight: Mostly clear, with a low around 80. West wind around 5 mph becoming calm.
Mostly Clear

 Tuesday

Tuesday: Sunny and hot, with a high near 100. Heat index values as high as 104. North wind around 5 mph.
Hot

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 79. Northwest wind around 5 mph.
Mostly Clear

 Wednesday

Wednesday: A slight chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 97. Northwest wind around 5 mph. Chance of precipitation is 20%.
Sunny then
Slight Chance
T-storms
 Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms between 8pm and 2am, then a slight chance of showers. Partly cloudy, with a low around 75. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
Chance
Showers
 Thursday

Thursday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90. Chance of precipitation is 50%.
Mostly Sunny
then Chance
T-storms
 Thursday
Night
Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
Chance
T-storms

 Friday

Friday: A chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 40%.
Mostly Cloudy
then Chance
T-storms
Hi 99 °F Lo 80 °F Hi 100 °F Lo 79 °F Hi 97 °F Lo 75 °F Hi 90 °F Lo 69 °F Hi 81 °F

Extreme Heat Warning
Air Quality Alert
 

Today
 
 Sunny and hot, with a high near 99. Heat index values as high as 108. Northwest wind around 5 mph.
Tonight
 
 Mostly clear, with a low around 80. West wind around 5 mph becoming calm.
Tuesday
 
 Sunny and hot, with a high near 100. Heat index values as high as 104. North wind around 5 mph.
Tuesday Night
 
 Mostly clear, with a low around 79. Northwest wind around 5 mph.
Wednesday
 
 A slight chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 97. Northwest wind around 5 mph. Chance of precipitation is 20%.
Wednesday Night
 
 A chance of showers and thunderstorms between 8pm and 2am, then a slight chance of showers. Partly cloudy, with a low around 75. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
 
 A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90. Chance of precipitation is 50%.
Thursday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
Friday
 
 A chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 40%.
Friday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.
Saturday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Saturday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Chance of precipitation is 40%.
Sunday
 
 A chance of showers and thunderstorms. Mostly cloudy, with a high near 85. Chance of precipitation is 40%.

 

Forecast from NOAA-NWS for Upper Darby PA.