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Severe Thunderstorms and Heavy Rainfall; Typhoon Watch in Guam and CNMI

Heavy to excessive rainfall will continue through tonight from the Texas Big Bend region into southern Oklahoma. Scattered damaging wind gusts and a few tornadoes may accompany a line of severe thunderstorms that is expected across the Mid-Atlantic into New England Friday. A Typhoon Watch continues for Guam and CNMI as Tropical Storm Champi will strengthen and approach the islands this weekend. Read More >

Hazardous Weather Conditions

Current conditions at

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Mostly Cloudy

69°F

21°C

Humidity 93%
Wind Speed S 12 mph
Barometer 29.84 in (1010.3 mb)
Dewpoint 67°F (19°C)
Visibility 7.00 mi
Last update 16 Oct 3:53 am EDT
Extended Forecast for

Castle Shannon PA

  • Overnight

    Overnight: Isolated showers and thunderstorms. Mostly cloudy, with a steady temperature around 70. Southwest wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

    Low: 70 °F

    Isolated
    T-storms

  • Friday

    Friday: Showers and thunderstorms before 4pm, then scattered showers. Temperature rising to near 72 by 11am, then falling to around 59 during the remainder of the day. Breezy, with a southwest wind 16 to 21 mph becoming west in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 72 °F⇓

    Showers
    Likely then
    Showers and
    Breezy

  • Friday Night

    Friday Night: Showers likely, mainly before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 42. West wind around 15 mph becoming north after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Showers
    Likely then
    Scattered
    Showers

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 51. North wind 13 to 16 mph.

    High: 51 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Patchy frost after midnight. Otherwise, clear, with a low around 33. Northwest wind around 6 mph becoming calm in the evening.

    Low: 33 °F

    Clear then
    Patchy Frost

  • Sunday

    Sunday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 59.

    High: 59 °F

    Frost then
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Patchy frost before 8am. Otherwise, sunny, with a high near 64.

    High: 64 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Overnight
Isolated showers and thunderstorms. Mostly cloudy, with a steady temperature around 70. Southwest wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Friday
Showers and thunderstorms before 4pm, then scattered showers. Temperature rising to near 72 by 11am, then falling to around 59 during the remainder of the day. Breezy, with a southwest wind 16 to 21 mph becoming west in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers likely, mainly before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 42. West wind around 15 mph becoming north after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 51. North wind 13 to 16 mph.
Saturday Night
Patchy frost after midnight. Otherwise, clear, with a low around 33. Northwest wind around 6 mph becoming calm in the evening.
Sunday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 37.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 64.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Sunny, with a high near 66.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
Sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 42.
Thursday
Sunny, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.37°N 80.02°W (Elev. 1109 ft)
Last Update:
2:21 am EDT Oct 16, 2026
Forecast Valid:
4am EDT Oct 16, 2026-6pm EDT Oct 22, 2026
 
Forecast Discussion
 
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Additional Resources

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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