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

32°F

0°C

Humidity 64%
Wind Speed Calm
Barometer 30.36 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 15 Mar 12:55 am EDT
Extended Forecast for

Mountainside NJ

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 37. Light north wind.

    Low: 37 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 50. Southeast wind 6 to 13 mph.

    High: 50 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of showers before 2am, then showers and possibly a thunderstorm between 2am and 5am, then showers after 5am. Temperature falling to near 44 by 10pm, then rising to around 51 during the remainder of the night. East wind 8 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 44 °F⇑

    Chance
    Showers then
    Showers

  • Monday

    Monday: Showers, with thunderstorms also possible after 8am. Some of the storms could produce heavy rainfall. High near 66. Breezy, with a south wind 14 to 20 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 66 °F

    Heavy Rain
    and Breezy

  • Monday Night

    Monday Night: Rain showers before 5am, then a chance of rain and snow showers. The rain could be heavy at times. Some thunder is also possible. Low around 32. Breezy, with a south wind 18 to 21 mph becoming west after midnight. Winds could gust as high as 41 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    Low: 32 °F

    Breezy. Heavy
    Rain then
    Rain/Snow

  • Tuesday

    Tuesday: A 30 percent chance of snow showers before 8am. Increasing clouds, with a high near 40.

    High: 40 °F

    Chance Snow
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 37. Light north wind.
Sunday
Partly sunny, with a high near 50. Southeast wind 6 to 13 mph.
Sunday Night
A chance of showers before 2am, then showers and possibly a thunderstorm between 2am and 5am, then showers after 5am. Temperature falling to near 44 by 10pm, then rising to around 51 during the remainder of the night. East wind 8 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers, with thunderstorms also possible after 8am. Some of the storms could produce heavy rainfall. High near 66. Breezy, with a south wind 14 to 20 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Rain showers before 5am, then a chance of rain and snow showers. The rain could be heavy at times. Some thunder is also possible. Low around 32. Breezy, with a south wind 18 to 21 mph becoming west after midnight. Winds could gust as high as 41 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Tuesday
A 30 percent chance of snow showers before 8am. Increasing clouds, with a high near 40.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Mostly sunny, with a high near 40.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
Partly sunny, with a high near 48.
Thursday Night
Mostly cloudy, with a low around 35.
Friday
Mostly sunny, with a high near 53.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 37.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mountainside NJ
 40.66°N 74.35°W (Elev. 141 ft)
Last Update:
7:50 pm EDT Mar 14, 2026
Forecast Valid:
1am EDT Mar 15, 2026-6pm EDT Mar 21, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation