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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

New Castle Municipal Airport (KUCP)

Lat: 41.02°NLon: 80.42°WElev: 1072ft.

Fair

66°F

19°C

Humidity 68%
Wind Speed Calm
Barometer 30.19 in (1023.4 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 18 Sep 7:56 pm EDT
Extended Forecast for

Slippery Rock PA

  • Tonight

    Tonight: Partly cloudy, with a low around 55. East wind around 6 mph.

    Low: 55 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers before 3pm, then a slight chance of showers after 4pm. Partly sunny, with a high near 75. East wind around 7 mph. Chance of precipitation is 20%.

    High: 75 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Low around 62. East wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Mostly Cloudy
    then Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 11am, then showers between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. High near 75. South wind around 7 mph becoming west in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 75 °F

    Showers

  • Sunday Night

    Sunday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 54. Northeast wind around 8 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 54 °F

    Showers
    Likely then
    Chance
    Showers

  • Monday

    Monday: A slight chance of showers after 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 20%.

    High: 68 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers after 8pm. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.

    Low: 53 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.

    High: 65 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.

    Low: 51 °F

    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 55. East wind around 6 mph.
Saturday
A slight chance of showers before 3pm, then a slight chance of showers after 4pm. Partly sunny, with a high near 75. East wind around 7 mph. Chance of precipitation is 20%.
Saturday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Low around 62. East wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers and possibly a thunderstorm before 11am, then showers between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. High near 75. South wind around 7 mph becoming west in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 54. Northeast wind around 8 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
A slight chance of showers after 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 20%.
Monday Night
A chance of showers after 8pm. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.
Tuesday
Showers likely. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.
Wednesday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 50. Chance of precipitation is 50%.
Thursday
A chance of showers. Mostly cloudy, with a high near 65. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 50.
Friday
Partly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Slippery Rock PA
 41.08°N 80.06°W (Elev. 1237 ft)
Last Update:
6:47 pm EDT Sep 18, 2026
Forecast Valid:
8pm EDT Sep 18, 2026-6pm EDT Sep 25, 2026
 
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