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

Heavy Rain and Flooding Concerns in Hawaii; Severe Weather in the Plains

A storm system is expected to bring strong winds, widespread heavy rainfall, and flooding concerns to the Hawaiian Islands through the weekend. Strong to severe thunderstorms are forecast from the Southern Plains to the Mid-Missouri Valley this afternoon and evening. Large hail and strong winds are the primary threats. Read More >

Hazardous Weather Conditions

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Fair

61°F

16°C

Humidity 31%
Wind Speed SE 14 mph
Barometer 30.36 in (1029.4 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 9 Apr 6:53 pm EDT
Extended Forecast for

Mercersburg PA

  • Tonight

    Tonight: Mostly clear, with a low around 39. South wind 5 to 8 mph becoming calm in the evening.

    Low: 39 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 75. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 75 °F

    Sunny

  • Friday Night

    Friday Night: A slight chance of showers before 2am. Increasing clouds, with a low around 49. Light and variable wind. Chance of precipitation is 20%.

    Low: 49 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 67. North wind around 6 mph.

    High: 67 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41. Calm wind.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 79.

    High: 79 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 59.

    Low: 59 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 39. South wind 5 to 8 mph becoming calm in the evening.
Friday
Sunny, with a high near 75. Calm wind becoming south 5 to 7 mph in the afternoon.
Friday Night
A slight chance of showers before 2am. Increasing clouds, with a low around 49. Light and variable wind. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 67. North wind around 6 mph.
Saturday Night
Mostly clear, with a low around 41. Calm wind.
Sunday
Mostly sunny, with a high near 71.
Sunday Night
Mostly cloudy, with a low around 57.
Monday
Mostly cloudy, with a high near 79.
Monday Night
Mostly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Mostly cloudy, with a low around 62.
Wednesday
Partly sunny, with a high near 88.
Wednesday Night
Mostly cloudy, with a low around 63.
Thursday
Partly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercersburg PA
 39.82°N 77.9°W (Elev. 600 ft)
Last Update:
6:56 pm EDT Apr 9, 2026
Forecast Valid:
7pm EDT Apr 9, 2026-6pm EDT Apr 16, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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