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

Allentown, Lehigh Valley International Airport (KABE)

Lat: 40.65°NLon: 75.45°WElev: 384ft.

Light Rain Fog/Mist

58°F

14°C

Humidity 93%
Wind Speed NE 13 mph
Barometer 29.95 in (1014.2 mb)
Dewpoint 56°F (13°C)
Visibility 5.00 mi
Last update 11 Oct 5:51 pm EDT
Extended Forecast for

Mertztown PA

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 57. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 57 °F

    Showers then
    Showers
    Likely

  • Columbus Day

    Columbus Day: Mostly cloudy, then gradually becoming sunny, with a high near 73. North wind 5 to 10 mph.

    High: 73 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 75. Light and variable wind becoming south 5 to 10 mph in the afternoon.

    High: 75 °F

    Gradual
    Clearing

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61. South wind 5 to 10 mph.

    Low: 61 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers after 2am. Partly cloudy, with a low around 51. Chance of precipitation is 50%.

    Low: 51 °F

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 57. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Columbus Day
Mostly cloudy, then gradually becoming sunny, with a high near 73. North wind 5 to 10 mph.
Monday Night
Partly cloudy, with a low around 54. Calm wind.
Tuesday
Cloudy through mid morning, then gradual clearing, with a high near 75. Light and variable wind becoming south 5 to 10 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 61. South wind 5 to 10 mph.
Wednesday
Mostly sunny, with a high near 76.
Wednesday Night
Mostly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 66.
Thursday Night
A chance of showers after 2am. Partly cloudy, with a low around 51. Chance of precipitation is 50%.
Friday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 46. Breezy. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 53. Breezy.
Saturday Night
Partly cloudy, with a low around 35.
Sunday
Sunny, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mertztown PA
 40.5°N 75.66°W (Elev. 499 ft)
Last Update:
4:10 pm EDT Oct 11, 2026
Forecast Valid:
6pm EDT Oct 11, 2026-6pm EDT Oct 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation