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

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Current conditions at

Morristown Airport (KMMU)

Lat: 40.8°NLon: 74.42°WElev: 187ft.

Partly Cloudy

73°F

23°C

Humidity 36%
Wind Speed SW 6 mph
Barometer 29.81 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 16 Jun 7:46 pm EDT
Extended Forecast for

Cedar Knolls NJ

  • Tonight

    Tonight: Mostly cloudy, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 79. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Partly Sunny
    then Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers after 4am. Mostly cloudy, with a low around 62. Southeast wind around 5 mph becoming calm. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers likely before 11am, then showers likely and possibly a thunderstorm between 11am and 2pm, then a slight chance of showers and thunderstorms after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 88. South wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 64. West wind 5 to 10 mph, with gusts as high as 25 mph.

    Low: 64 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 57. Calm wind.
Wednesday
A chance of showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 79. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers after 4am. Mostly cloudy, with a low around 62. Southeast wind around 5 mph becoming calm. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers likely before 11am, then showers likely and possibly a thunderstorm between 11am and 2pm, then a slight chance of showers and thunderstorms after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 88. South wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Partly cloudy, with a low around 64. West wind 5 to 10 mph, with gusts as high as 25 mph.
Juneteenth
Mostly sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 60.
Saturday
Sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 59.
Sunday
Sunny, with a high near 82.
Sunday Night
A chance of showers. Partly cloudy, with a low around 60. Chance of precipitation is 30%.
Monday
A chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 50%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 50%.
Tuesday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cedar Knolls NJ
 40.83°N 74.46°W (Elev. 322 ft)
Last Update:
4:08 pm EDT Jun 16, 2026
Forecast Valid:
8pm EDT Jun 16, 2026-6pm EDT Jun 23, 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