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

Flooding Risks from Tropical Moisture Across the Southeast and Southwest

Tropical moisture from Isaias and Rachel will impact portions of the Southeast and Southwest this weekend. Flash flooding, strong winds and even a threat for severe thunderstorms and tornadoes are possible. Meanwhile, strong winds and dry fuels are raising fire weather concerns across the central Great Basin and western High Plains. Across the northern Rockies, first winter storm of the season. Read More >

Current conditions at

Harrisburg, Harrisburg International Airport (KMDT)

Lat: 40.19°NLon: 76.76°WElev: 312ft.

Partly Cloudy

53°F

12°C

Humidity 83%
Wind Speed Calm
Barometer 30.43 in (1030.5 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 10 Oct 8:56 am EDT
Extended Forecast for

Hummelstown PA

  • Today

    Today: Mostly cloudy, with a high near 71. Calm wind becoming east 5 to 7 mph in the afternoon.

    High: 71 °F

    Mostly Cloudy

  • Tonight

    Tonight: A chance of rain, mainly after 4am. Mostly cloudy, with a low around 55. East wind 5 to 7 mph. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 55 °F

    Mostly Cloudy
    then Chance
    Rain

  • Sunday

    Sunday: Periods of rain, with thunderstorms also possible after 5pm. High near 64. East wind 11 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 64 °F

    Rain

  • Sunday Night

    Sunday Night: Rain likely and possibly a thunderstorm. Cloudy, with a low around 60. East wind 5 to 14 mph becoming north after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 60 °F

    Rain Likely

  • Columbus Day

    Columbus Day: Partly sunny, with a high near 74. Northwest wind 9 to 13 mph, with gusts as high as 22 mph.

    High: 74 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 57 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 71. Calm wind becoming east 5 to 7 mph in the afternoon.
Tonight
A chance of rain, mainly after 4am. Mostly cloudy, with a low around 55. East wind 5 to 7 mph. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Periods of rain, with thunderstorms also possible after 5pm. High near 64. East wind 11 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Sunday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 60. East wind 5 to 14 mph becoming north after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Columbus Day
Partly sunny, with a high near 74. Northwest wind 9 to 13 mph, with gusts as high as 22 mph.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Mostly cloudy, with a low around 57.
Wednesday
Mostly sunny, with a high near 68.
Wednesday Night
Partly cloudy, with a low around 49.
Thursday
A chance of showers. Mostly sunny, with a high near 65. Chance of precipitation is 30%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 30%.
Friday
A chance of showers. Partly sunny, with a high near 66. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hummelstown PA
 40.26°N 76.7°W (Elev. 427 ft)
Last Update:
8:55 am EDT Oct 10, 2026
Forecast Valid:
9am EDT Oct 10, 2026-6pm EDT Oct 16, 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