National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Philadelphia, Philadelphia International Airport (KPHL)

Lat: 39.87°NLon: 75.23°WElev: 7ft.

Mostly Cloudy

76°F

24°C

Humidity 91%
Wind Speed N 10 mph
Barometer 29.92 in (1013.0 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 18 Aug 3:54 am EDT
Extended Forecast for

Merion Station PA

  • Today

    Today: A slight chance of showers between 3pm and 5pm. Mostly cloudy, with a high near 73. Northeast wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 73 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 64. East wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 64 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 77. East wind 5 to 10 mph.

    High: 77 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. East wind around 5 mph.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers after 2pm. Partly sunny, with a high near 81. East wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 81 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers before 2am. Partly cloudy, with a low around 64. Chance of precipitation is 20%.

    Low: 64 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers between 3pm and 5pm. Mostly cloudy, with a high near 73. Northeast wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tonight
A slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 64. East wind 5 to 10 mph. Chance of precipitation is 20%.
Tuesday
Partly sunny, with a high near 77. East wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 63. East wind around 5 mph.
Wednesday
A slight chance of showers after 2pm. Partly sunny, with a high near 81. East wind 5 to 10 mph. Chance of precipitation is 20%.
Wednesday Night
A slight chance of showers before 2am. Partly cloudy, with a low around 64. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 64.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
A chance of showers. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Sunday
A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Merion Station PA
 40.01°N 75.23°W (Elev. 240 ft)
Last Update:
4:11 pm EDT Aug 17, 2025
Forecast Valid:
4am EDT Aug 18, 2025-6pm EDT Aug 24, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation