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

Morristown Airport (KMMU)

Lat: 40.8°NLon: 74.42°WElev: 187ft.

Fair

7°F

-14°C

Humidity 72%
Wind Speed SW 3 mph
Barometer 30.50 in
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Last update 20 Jan 10:35 pm EST
Extended Forecast for

Mountainside NJ

  • Tonight

    Tonight: Mostly clear, with a low around 8. Wind chill values between zero and 5. West wind 3 to 6 mph.

    Low: 8 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 30. Wind chill values between 10 and 20. Calm wind becoming south 5 to 8 mph in the morning.

    High: 30 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a steady temperature around 30. Wind chill values between 20 and 25. Southwest wind around 8 mph.

    Low: 30 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Southwest wind 8 to 13 mph, with gusts as high as 24 mph.

    High: 41 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 23. West wind 6 to 8 mph.

    Low: 23 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 7.

    Low: 7 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 17.

    High: 17 °F

    Cold

  • Saturday Night

    Saturday Night: A 50 percent chance of snow after 1am. Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 8. Wind chill values between zero and 5. West wind 3 to 6 mph.
Wednesday
Increasing clouds, with a high near 30. Wind chill values between 10 and 20. Calm wind becoming south 5 to 8 mph in the morning.
Wednesday Night
Mostly cloudy, with a steady temperature around 30. Wind chill values between 20 and 25. Southwest wind around 8 mph.
Thursday
Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Southwest wind 8 to 13 mph, with gusts as high as 24 mph.
Thursday Night
Mostly cloudy, with a low around 23. West wind 6 to 8 mph.
Friday
Partly sunny, with a high near 30.
Friday Night
Partly cloudy, with a low around 7.
Saturday
Partly sunny and cold, with a high near 17.
Saturday Night
A 50 percent chance of snow after 1am. Mostly cloudy, with a low around 10.
Sunday
Snow likely. Cloudy and cold, with a high near 18. Chance of precipitation is 60%.
Sunday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 9.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 23.
Monday Night
Partly cloudy, with a low around 10.
Tuesday
Mostly sunny, with a high near 23.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mountainside NJ
 40.69°N 74.37°W (Elev. 417 ft)
Last Update:
6:01 pm EST Jan 20, 2026
Forecast Valid:
10pm EST Jan 20, 2026-6pm EST Jan 27, 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