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.

Partly Cloudy

70°F

21°C

Humidity 53%
Wind Speed SW 5 mph
Barometer 29.91 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 11 Mar 10:45 am EDT
Extended Forecast for

Mountainside NJ

  • Today

    Today: A 40 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 81. Light south wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 21 mph.

    High: 81 °F

    Mostly Sunny
    then Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 45. South wind 11 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    Low: 45 °F

    Chance
    Showers

  • Thursday

    Thursday: A 50 percent chance of showers before 2pm. Mostly cloudy, with a temperature falling to around 42 by 3pm. Northwest wind 14 to 17 mph, with gusts as high as 29 mph.

    High: 58 °F⇓

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31. West wind 5 to 10 mph.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Increasing clouds, with a high near 49. South wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 49 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Sunday

    Sunday: Cloudy, with a high near 52.

    High: 52 °F

    Cloudy

Detailed Forecast

Today
A 40 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 81. Light south wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 21 mph.
Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 45. South wind 11 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Thursday
A 50 percent chance of showers before 2pm. Mostly cloudy, with a temperature falling to around 42 by 3pm. Northwest wind 14 to 17 mph, with gusts as high as 29 mph.
Thursday Night
Mostly clear, with a low around 31. West wind 5 to 10 mph.
Friday
Increasing clouds, with a high near 49. South wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 29 mph.
Friday Night
Partly cloudy, with a low around 37.
Saturday
Sunny, with a high near 49.
Saturday Night
Mostly cloudy, with a low around 33.
Sunday
Cloudy, with a high near 52.
Sunday Night
Showers likely, mainly after 2am. Cloudy, with a low around 44. Chance of precipitation is 70%.
Monday
Showers. High near 61. Chance of precipitation is 90%.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 28.
Tuesday
Mostly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mountainside NJ
 40.69°N 74.37°W (Elev. 417 ft)
Last Update:
9:48 am EDT Mar 11, 2026
Forecast Valid:
10am EDT Mar 11, 2026-6pm EDT Mar 17, 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