National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heat Wave Continues in the West; Critical Fire Weather Conditions in the High Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. Read More >

Current conditions at

Morristown Airport (KMMU)

Lat: 40.8°NLon: 74.42°WElev: 187ft.

Mostly Cloudy

34°F

1°C

Humidity 32%
Wind Speed NW 5 mph
Barometer 30.41 in
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 18 Mar 1:45 pm EDT
Extended Forecast for

Mountainside NJ

  • This Afternoon

    This Afternoon: Sunny, with a high near 37. Light south wind.

    High: 37 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 26. Southeast wind around 6 mph becoming calm after midnight.

    Low: 26 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 45. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 45 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, then becoming mostly clear toward daybreak, with a low around 34. Southeast wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 57. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 57 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Rain likely. Cloudy, with a low around 44. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 44 °F

    Rain Likely

  • Saturday

    Saturday: A 30 percent chance of rain before 8am. Partly sunny, with a high near 59.

    High: 59 °F

    Chance Rain
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 37. Light south wind.
Tonight
Increasing clouds, with a low around 26. Southeast wind around 6 mph becoming calm after midnight.
Thursday
Mostly sunny, with a high near 45. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
Mostly cloudy, then becoming mostly clear toward daybreak, with a low around 34. Southeast wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 57. Calm wind becoming south 5 to 8 mph in the afternoon.
Friday Night
Rain likely. Cloudy, with a low around 44. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A 30 percent chance of rain before 8am. Partly sunny, with a high near 59.
Saturday Night
Mostly cloudy, with a low around 42.
Sunday
Mostly cloudy, with a high near 64.
Sunday Night
A chance of rain after 8pm, mixing with snow after 2am. Mostly cloudy, with a low around 39. Chance of precipitation is 30%.
Monday
A 30 percent chance of snow. Mostly sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Mostly sunny, with a high near 45.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mountainside NJ
 40.69°N 74.37°W (Elev. 417 ft)
Last Update:
2:35 pm EDT Mar 18, 2026
Forecast Valid:
2pm EDT Mar 18, 2026-6pm EDT Mar 24, 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