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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Morristown Airport (KMMU)

Lat: 40.8°NLon: 74.42°WElev: 187ft.

Partly Cloudy

68°F

20°C

Humidity 100%
Wind Speed SE 5 mph
Barometer 29.98 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 27 Aug 9:45 pm EDT
Extended Forecast for

Mendham NJ

Flood Watch until August 28, 04:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch until August 28, 04:00am

    NOW until 4:00am Fri

    Flood Watch

  • Tonight

    Low: 66 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 82. Calm wind.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 61. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 61 °F

    Chance
    Showers then
    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 81. North wind around 5 mph becoming calm.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Mostly sunny, with a high near 82. Calm wind.
Friday Night
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 61. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Sunny, with a high near 81. North wind around 5 mph becoming calm.
Saturday Night
Mostly clear, with a low around 62. Calm wind.
Sunday
Sunny, with a high near 83.
Sunday Night
Partly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 84.
Monday Night
A chance of showers after 2am. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.
Tuesday
A chance of showers before 8am, then a chance of showers after 2pm. Partly sunny, with a high near 85. Chance of precipitation is 30%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 68. Chance of precipitation is 50%.
Wednesday
A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 50%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 67. Chance of precipitation is 50%.
Thursday
A chance of showers. Partly sunny, with a high near 81. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mendham NJ
 40.76°N 74.59°W (Elev. 600 ft)
Last Update:
4:08 pm EDT Aug 27, 2026
Forecast Valid:
10pm EDT Aug 27, 2026-6pm EDT Sep 3, 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