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.

Overcast

55°F

13°C

Humidity 94%
Wind Speed N 5 mph
Barometer 30.21 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 22 Sep 4:55 am EDT
Extended Forecast for

Mountainside NJ

  • Overnight

    Overnight: A 20 percent chance of showers. Cloudy, with a low around 55. Northeast wind around 8 mph.

    Low: 55 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 64. Northeast wind around 10 mph, with gusts as high as 22 mph.

    High: 64 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 52. Northeast wind around 11 mph, with gusts as high as 21 mph.

    Low: 52 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 66. Northeast wind 13 to 15 mph, with gusts as high as 30 mph.

    High: 66 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 50. Northeast wind 11 to 13 mph, with gusts as high as 26 mph.

    Low: 50 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 20 percent chance of showers. Cloudy, with a low around 55. Northeast wind around 8 mph.
Tuesday
Mostly cloudy, with a high near 64. Northeast wind around 10 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly cloudy, with a low around 52. Northeast wind around 11 mph, with gusts as high as 21 mph.
Wednesday
Partly sunny, with a high near 66. Northeast wind 13 to 15 mph, with gusts as high as 30 mph.
Wednesday Night
Partly cloudy, with a low around 50. Northeast wind 11 to 13 mph, with gusts as high as 26 mph.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Mostly cloudy, with a low around 51.
Friday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 66.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 53.
Saturday
A 50 percent chance of showers. Partly sunny, with a high near 65.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 54.
Sunday
Mostly sunny, with a high near 68.
Sunday Night
Partly cloudy, with a low around 54.
Monday
Mostly 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:
2:35 am EDT Sep 22, 2026
Forecast Valid:
5am EDT Sep 22, 2026-6pm EDT Sep 28, 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