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.

Fair

36°F

2°C

Humidity 52%
Wind Speed Calm
Barometer 30.34 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 21 Apr 12:35 am EDT
Extended Forecast for

Mountainside NJ

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

    NOW until 9:00am Tue

    Freeze Warning

  • Overnight

    Low: 31 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 55. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 55 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 2am. Increasing clouds, with a low around 42. South wind around 7 mph.

    Low: 42 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 62. South wind around 7 mph.

    High: 62 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 46. East wind around 5 mph becoming calm in the evening.

    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 49.

    Low: 49 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

Detailed Forecast

Overnight
Clear, with a low around 31. North wind 3 to 6 mph.
Tuesday
Sunny, with a high near 55. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
A 20 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 noon. Mostly cloudy, with a high near 62. South wind around 7 mph.
Wednesday Night
Partly cloudy, with a low around 46. East wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 70.
Thursday Night
Partly cloudy, with a low around 49.
Friday
Mostly sunny, with a high near 67.
Friday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 48.
Saturday
A 50 percent chance of showers. Mostly cloudy, with a high near 58.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 48.
Sunday
A 30 percent chance of showers. Mostly cloudy, with a high near 61.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 45.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mountainside NJ
 40.66°N 74.35°W (Elev. 141 ft)
Last Update:
6:38 pm EDT Apr 20, 2026
Forecast Valid:
1am EDT Apr 21, 2026-6pm EDT Apr 27, 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