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.

Fog/Mist

72°F

22°C

Humidity 100%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 72°F (22°C)
Visibility 5.00 mi
Last update 15 Jul 2:35 am EDT
Extended Forecast for

Mountainside NJ

  • Overnight

    Overnight: A 40 percent chance of showers and thunderstorms. Patchy fog. Otherwise, mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Chance
    Showers and
    Patchy Fog

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly between 2pm and 5pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 89. Heat index values as high as 95. Light and variable wind.

    High: 89 °F

    Chance
    T-storms and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 74. Light south wind.

    Low: 74 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 90. Heat index values as high as 101. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 90 °F

    Chance
    T-storms and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75. Southwest wind 3 to 7 mph.

    Low: 75 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 50%.

    High: 91 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of thunderstorms before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 30%.

    Low: 76 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms. Patchy fog. Otherwise, mostly cloudy, with a low around 72. Calm wind.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly between 2pm and 5pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 89. Heat index values as high as 95. Light and variable wind.
Tuesday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 74. Light south wind.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly after 2pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 90. Heat index values as high as 101. Calm wind becoming south 5 to 8 mph in the afternoon.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75. Southwest wind 3 to 7 mph.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 50%.
Thursday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 30%.
Friday
A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 69.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 71.
Sunday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
Mountainside NJ
 40.66°N 74.35°W (Elev. 141 ft)
Last Update:
2:23 am EDT Jul 15, 2025
Forecast Valid:
2am EDT Jul 15, 2025-6pm EDT Jul 21, 2025
 
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