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

68°F

20°C

Humidity 69%
Wind Speed NW 6 mph
Barometer 29.79 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 17 Apr 5:35 am EDT
Extended Forecast for

Mountainside NJ

  • Overnight

    Overnight: A 30 percent chance of showers. Mostly cloudy, with a low around 66. Northwest wind around 6 mph.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: Scattered showers, with thunderstorms also possible after 2pm. Mostly cloudy, then gradually becoming sunny, with a high near 79. Northwest wind 6 to 8 mph. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 56. Northeast wind around 6 mph becoming east after midnight.

    Low: 56 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 68. Southeast wind 5 to 9 mph.

    High: 68 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 51. Southeast wind 6 to 9 mph. Chance of precipitation is 40%.

    Low: 51 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 57. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 57 °F

    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 37.

    Low: 37 °F

    Decreasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers. Mostly cloudy, with a low around 66. Northwest wind around 6 mph.
Friday
Scattered showers, with thunderstorms also possible after 2pm. Mostly cloudy, then gradually becoming sunny, with a high near 79. Northwest wind 6 to 8 mph. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 56. Northeast wind around 6 mph becoming east after midnight.
Saturday
Mostly sunny, with a high near 68. Southeast wind 5 to 9 mph.
Saturday Night
A chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 51. Southeast wind 6 to 9 mph. Chance of precipitation is 40%.
Sunday
Showers, mainly after 8am. High near 57. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 37.
Monday
Mostly sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Sunny, with a high near 56.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Mostly sunny, with a high near 69.
Wednesday Night
Partly cloudy, with a low around 48.
Thursday
Sunny, with a high near 70.
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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:
2:22 am EDT Apr 17, 2026
Forecast Valid:
5am EDT Apr 17, 2026-6pm EDT Apr 23, 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