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

Hazardous Weather Conditions

Current conditions at

Morristown Airport (KMMU)

Lat: 40.8°NLon: 74.42°WElev: 187ft.

Partly Cloudy

34°F

1°C

Humidity 100%
Wind Speed Calm
Barometer 30.15 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 20 Apr 7:45 am EDT
Extended Forecast for

Mountainside NJ

Freeze Warning April 21, 12:00am until April 21, 09:00am
Click here for hazard details and duration
Freeze Warning

  • Today

    Today: A 20 percent chance of showers before noon. Partly sunny, with a high near 53. Northwest wind 5 to 11 mph.

    High: 53 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 30. North wind 7 to 10 mph.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 54. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 54 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers after 2am. Increasing clouds, with a low around 42. South wind around 7 mph.

    Low: 42 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers, mainly before 8am. Partly sunny, with a high near 63. South wind around 7 mph.

    High: 63 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 48.

    Low: 48 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

Detailed Forecast

Today
A 20 percent chance of showers before noon. Partly sunny, with a high near 53. Northwest wind 5 to 11 mph.
Tonight
Mostly clear, with a low around 30. North wind 7 to 10 mph.
Tuesday
Sunny, with a high near 54. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
A 40 percent chance of showers after 2am. Increasing clouds, with a low around 42. South wind around 7 mph.
Wednesday
A 30 percent chance of showers, mainly before 8am. Partly sunny, with a high near 63. South wind around 7 mph.
Wednesday Night
Partly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 70.
Thursday Night
Partly cloudy, with a low around 48.
Friday
Mostly sunny, with a high near 66.
Friday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 48.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 59.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 46.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 60.
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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:
6:13 am EDT Apr 20, 2026
Forecast Valid:
8am EDT Apr 20, 2026-6pm EDT Apr 26, 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