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

Hazardous Weather Conditions

Current conditions at

Morristown Airport (KMMU)

Lat: 40.8°NLon: 74.42°WElev: 187ft.

Mostly Cloudy

30°C

86°F

Humidity 66%
Wind Speed SW 11 km/h
Barometer 30.06 in
Dewpoint 23°C (73°F)
Visibility 16 km
Heat Index34°C (93°F)
Last update 15 Jul 2:45 pm EDT
Extended Forecast for

Summit NJ

Heat Advisory July 16, 11:00am until July 17, 10:00pm
Click here for hazard details and duration
Heat Advisory

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 31. Calm wind.

    High: 31 °C

    Slight Chance
    T-storms

  • Tonight

    Tonight: Patchy fog before 3am, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 22. Calm wind.

    Low: 22 °C

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 32. Heat index values as high as 37. Calm wind becoming south 5 to 10 km/h in the afternoon.

    High: 32 °C

    Chance
    T-storms and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23. Southwest wind 5 to 8 km/h.

    Low: 23 °C

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 33. Southwest wind 10 to 14 km/h. Chance of precipitation is 70%. New rainfall amounts between 2.5 and 5 mm possible.

    High: 33 °C

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 24. Chance of precipitation is 60%.

    Low: 24 °C

    Showers
    Likely then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 31.

    High: 31 °C

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 19.

    Low: 19 °C

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 29.

    High: 29 °C

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 31. Calm wind.
Tonight
Patchy fog before 3am, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 22. Calm wind.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 32. Heat index values as high as 37. Calm wind becoming south 5 to 10 km/h in the afternoon.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23. Southwest wind 5 to 8 km/h.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 33. Southwest wind 10 to 14 km/h. Chance of precipitation is 70%. New rainfall amounts between 2.5 and 5 mm possible.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 24. Chance of precipitation is 60%.
Friday
Mostly sunny, with a high near 31.
Friday Night
Mostly clear, with a low around 19.
Saturday
Mostly sunny, with a high near 29.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 21.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 29. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 21. Chance of precipitation is 60%.
Monday
Mostly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 28.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Summit NJ
 40.71°N 74.37°W (Elev. 400 m)
Last Update:
3:16 pm EDT Jul 15, 2025
Forecast Valid:
3pm EDT Jul 15, 2025-6pm EDT Jul 22, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

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Chance of Precipitation