NWS Forecast for Merion Station PA

National Weather Service Forecast for: Merion Station PA
Issued by: National Weather Service Philadelphia, PA

Updated: 11:00 am EDT Jun 30, 2026

Today Mostly Sunny	Tonight Mostly Cloudy	Wednesday Mostly Sunny then Slight Chance T-storms	Wednesday Night Mostly Clear	Thursday Hot	Thursday Night Mostly Clear	Friday Hot	Friday Night Partly Cloudy	Independence Day Sunny then Chance T-storms
Hi 91 °F	Lo 71 °F	Hi 97 °F	Lo 76 °F	Hi 102 °F	Lo 79 °F	Hi 103 °F	Lo 79 °F	Hi 101 °F

Air Quality Alert
Extreme Heat Warning

Today	Mostly sunny, with a high near 91. Southwest wind 10 to 15 mph.
Tonight	Mostly cloudy, with a low around 71. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday	A slight chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Wednesday Night	Mostly clear, with a low around 76. Southwest wind 5 to 10 mph.
Thursday	Sunny and hot, with a high near 102. West wind 5 to 10 mph.
Thursday Night	Mostly clear, with a low around 79.
Friday	Sunny and hot, with a high near 103.
Friday Night	Partly cloudy, with a low around 79.
Independence Day	A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 101. Chance of precipitation is 30%.
Saturday Night	A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 75. Chance of precipitation is 40%.
Sunday	A chance of showers and thunderstorms. Mostly sunny, with a high near 95. Chance of precipitation is 30%.
Sunday Night	A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Chance of precipitation is 40%.
Monday	A chance of showers and thunderstorms. Partly sunny, with a high near 91. Chance of precipitation is 40%.

Forecast from NOAA-NWS for Merion Station PA.