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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Somerville, Somerset Airport (KSMQ)

Lat: 40.62°NLon: 74.67°WElev: 105ft.

Fair

83°F

28°C

Humidity 43%
Wind Speed Vrbl 5 mph
Barometer 30.05 in (1017.4 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 18 Sep 1:53 pm EDT
Extended Forecast for

Long Valley NJ

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 80. North wind around 5 mph.

    High: 80 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 52. North wind around 5 mph.

    Low: 52 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 69. Northeast wind around 5 mph becoming southeast in the afternoon.

    High: 69 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers, mainly after 3am. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 57. Southeast wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 57 °F

    Patchy Fog
    then Chance
    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 2pm. Some of the storms could produce heavy rainfall. High near 68. Southeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 68 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Some of the storms could produce heavy rainfall. Patchy fog. Low around 57. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

    Low: 57 °F

    Heavy Rain
    and Patchy
    Fog

  • Monday

    Monday: A chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 30%.

    High: 64 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 30%.

    Low: 53 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 30%.

    High: 61 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 80. North wind around 5 mph.
Tonight
Mostly clear, with a low around 52. North wind around 5 mph.
Saturday
Mostly sunny, with a high near 69. Northeast wind around 5 mph becoming southeast in the afternoon.
Saturday Night
A chance of showers, mainly after 3am. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 57. Southeast wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Showers, with thunderstorms also possible after 2pm. Some of the storms could produce heavy rainfall. High near 68. Southeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Some of the storms could produce heavy rainfall. Patchy fog. Low around 57. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Monday
A chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 30%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 30%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 30%.
Tuesday Night
A chance of showers after 2am. Mostly cloudy, with a low around 49. Chance of precipitation is 30%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 60. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 49. Chance of precipitation is 40%.
Thursday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Long Valley NJ
 40.78°N 74.76°W (Elev. 725 ft)
Last Update:
2:12 pm EDT Sep 18, 2026
Forecast Valid:
2pm EDT Sep 18, 2026-6pm EDT Sep 24, 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