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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Hazardous Weather Conditions

Current conditions at

Morristown Airport (KMMU)

Lat: 40.8°NLon: 74.42°WElev: 187ft.

Fog

43°F

6°C

Humidity 100%
Wind Speed Calm
Barometer 29.75 in
Dewpoint 43°F (6°C)
Visibility 0.25 mi
Last update 21 Mar 4:15 am EDT
Extended Forecast for

Denville NJ

Dense Fog Advisory until March 21, 08:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until March 21, 08:00am

    NOW until 8:00am Sat

    Dense Fog Advisory

  • Overnight

    Low: 43 °F

    Areas Dense
    Fog

  • Saturday

    Saturday: Areas of dense fog before 8am. Otherwise, sunny, with a high near 56. Northwest wind 10 to 15 mph.

    High: 56 °F

    Areas Dense
    Fog then
    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 40. Calm wind becoming south around 5 mph after midnight.

    Low: 40 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 67. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 67 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 11pm, then showers after 11pm. Low around 40. North wind 5 to 10 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Showers

  • Monday

    Monday: A chance of showers before 2pm. Partly sunny, with a high near 48. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 48 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 28.

    Low: 28 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, mostly cloudy, with a low around 43. West wind around 5 mph.
Saturday
Areas of dense fog before 8am. Otherwise, sunny, with a high near 56. Northwest wind 10 to 15 mph.
Saturday Night
Increasing clouds, with a low around 40. Calm wind becoming south around 5 mph after midnight.
Sunday
A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 67. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A chance of showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 11pm, then showers after 11pm. Low around 40. North wind 5 to 10 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Monday
A chance of showers before 2pm. Partly sunny, with a high near 48. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Mostly clear, with a low around 28.
Tuesday
Sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Partly sunny, with a high near 53.
Wednesday Night
Mostly cloudy, with a low around 34.
Thursday
Mostly cloudy, with a high near 53.
Thursday Night
Rain likely. Mostly cloudy, with a low around 38. Chance of precipitation is 60%.
Friday
Rain likely. Partly sunny, with a high near 50. Chance of precipitation is 60%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Denville NJ
 40.88°N 74.48°W (Elev. 574 ft)
Last Update:
4:09 am EDT Mar 21, 2026
Forecast Valid:
4am EDT Mar 21, 2026-6pm EDT Mar 27, 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