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

Hurricane and Storm Surge Watches Issued for the Northern Gulf Coast for Strengthening Tropical Storm Isaias

Tropical Storm Isaias is forecast to track toward the central Gulf Coast while strengthening into a hurricane on Thursday. There is an increasing risk of damaging hurricane-force winds and life-threatening storm surge impacts along portions of the northern Gulf Coast Friday into Saturday. Isaias will bring heavy rainfall to the central Gulf Coast and much of the Southeast Friday into the weekend. Read More >

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Fair

67°F

19°C

Humidity 57%
Wind Speed S 9 mph
Barometer 29.87 in (1012.3 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 7 Oct 6:53 pm EDT
Extended Forecast for

Greencastle PA

  • Tonight

    Tonight: Mostly clear, with a low around 54. South wind 3 to 7 mph.

    Low: 54 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 75. Light west wind becoming northwest 8 to 13 mph in the morning. Winds could gust as high as 20 mph.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 48. Light and variable wind.

    Low: 48 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 72. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 72 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 51. Calm wind.

    Low: 51 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers, mainly after 2am. Low around 57. Chance of precipitation is 100%.

    Low: 57 °F

    Chance
    Showers then
    Showers

  • Sunday

    Sunday: Showers. High near 66. Chance of precipitation is 100%.

    High: 66 °F

    Showers

  • Sunday Night

    Sunday Night: Showers likely before 2am. Cloudy, with a low around 61. Chance of precipitation is 60%.

    Low: 61 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 54. South wind 3 to 7 mph.
Thursday
Sunny, with a high near 75. Light west wind becoming northwest 8 to 13 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
Clear, with a low around 48. Light and variable wind.
Friday
Sunny, with a high near 72. Calm wind becoming northwest around 6 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 51. Calm wind.
Saturday
Mostly sunny, with a high near 76.
Saturday Night
Showers, mainly after 2am. Low around 57. Chance of precipitation is 100%.
Sunday
Showers. High near 66. Chance of precipitation is 100%.
Sunday Night
Showers likely before 2am. Cloudy, with a low around 61. Chance of precipitation is 60%.
Columbus Day
Mostly cloudy, with a high near 73.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 71.
Tuesday Night
Mostly cloudy, with a low around 47.
Wednesday
Mostly sunny, with a high near 61.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Greencastle PA
 39.78°N 77.74°W (Elev. 548 ft)
Last Update:
2:21 pm EDT Oct 7, 2026
Forecast Valid:
7pm EDT Oct 7, 2026-6pm EDT Oct 14, 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