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

New Castle Municipal Airport (KUCP)

Lat: 41.02°NLon: 80.42°WElev: 1072ft.

Light Rain

69°F

21°C

Humidity 100%
Wind Speed Calm
Barometer 30.01 in (1017.0 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 20 Aug 10:56 am EDT
Extended Forecast for

Mercer PA

  • Today

    Today: A chance of showers and thunderstorms. Cloudy, then gradually becoming mostly sunny, with a high near 78. Northeast wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Chance
    Showers

  • Tonight

    Tonight: Mostly clear, with a low around 57. Northeast wind 3 to 5 mph.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 81. Southeast wind around 6 mph.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61. Light east wind.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 81. Light and variable wind becoming southwest 5 to 8 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Mostly Sunny
    then Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 58 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of thunderstorms before 8pm. Partly cloudy, with a low around 54. Chance of precipitation is 30%.

    Low: 54 °F

    Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms. Cloudy, then gradually becoming mostly sunny, with a high near 78. Northeast wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Mostly clear, with a low around 57. Northeast wind 3 to 5 mph.
Friday
Sunny, with a high near 81. Southeast wind around 6 mph.
Friday Night
Mostly clear, with a low around 61. Light east wind.
Saturday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 81. Light and variable wind becoming southwest 5 to 8 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.
Sunday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 54. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 54.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer PA
 41.23°N 80.22°W (Elev. 1102 ft)
Last Update:
8:21 am EDT Aug 20, 2026
Forecast Valid:
11am EDT Aug 20, 2026-6pm EDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation