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.

Clear

41°F

5°C

Humidity 36%
Wind Speed N 5 mph
Barometer 30.26 in
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 14 Mar 9:00 pm EDT
Extended Forecast for

Mountainside NJ

  • Tonight

    Tonight: Partly cloudy, with a low around 33. Northwest wind 3 to 8 mph. Winds could gust as high as 20 mph.

    Low: 33 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 49. Southeast wind 6 to 14 mph.

    High: 49 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Showers, mainly after 2am. Temperature falling to near 43 by 9pm, then rising to around 51 during the remainder of the night. Southeast wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 43 °F⇑

    Chance
    Showers then
    Showers

  • Monday

    Monday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 65. Breezy, with a south wind 14 to 20 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 65 °F

    Heavy Rain
    and Breezy

  • Monday Night

    Monday Night: Rain showers before 2am, then a chance of rain and snow showers. The rain could be heavy at times. Some thunder is also possible. Low around 31. Breezy, with a south wind 20 to 22 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: 31 °F

    Breezy. Heavy
    Rain then
    Rain/Snow

  • Tuesday

    Tuesday: A 30 percent chance of snow showers before 8am. Increasing clouds, with a high near 38.

    High: 38 °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 39.

    High: 39 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 33. Northwest wind 3 to 8 mph. Winds could gust as high as 20 mph.
Sunday
Partly sunny, with a high near 49. Southeast wind 6 to 14 mph.
Sunday Night
Showers, mainly after 2am. Temperature falling to near 43 by 9pm, then rising to around 51 during the remainder of the night. Southeast wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 65. Breezy, with a south wind 14 to 20 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Rain showers before 2am, then a chance of rain and snow showers. The rain could be heavy at times. Some thunder is also possible. Low around 31. Breezy, with a south wind 20 to 22 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 38.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Mostly sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 47.
Thursday Night
Mostly cloudy, with a low around 34.
Friday
Mostly sunny, with a high near 51.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 36.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 52.
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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:
7:50 pm EDT Mar 14, 2026
Forecast Valid:
9pm EDT Mar 14, 2026-6pm EDT Mar 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation