7-Day Forecast 40.69°N 74.37°W (Text-Only)
NWS Forecast for: Mountainside NJ
Issued by: National Weather Service New York, NY
Last Update: 3:17 am EDT Jun 21, 2025
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  • Overnight

    Overnight: Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 89. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 89 °F

    Mostly Sunny

  • Saturday
    Night

    Saturday Night: Partly cloudy, with a low around 71. Southwest wind around 6 mph.

    Low: 71 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 95. Heat index values as high as 103. West wind 8 to 11 mph, with gusts as high as 21 mph.

    High: 95 °F

    Mostly Sunny

  • Sunday
    Night

    Sunday Night: Mostly clear, with a low around 77. West wind 6 to 8 mph.

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 100.

    High: 100 °F

    Hot

  • Monday
    Night

    Monday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 99.

    High: 99 °F

    Sunny

  • Tuesday
    Night

    Tuesday Night: Partly cloudy, with a low around 77.

    Low: 77 °F

    Partly Cloudy



  • Overnight: Partly cloudy, with a low around 66. Calm wind.

    Saturday: Mostly sunny, with a high near 89. Calm wind becoming west 5 to 7 mph in the afternoon.

    Saturday Night: Partly cloudy, with a low around 71. Southwest wind around 6 mph.

    Sunday: Mostly sunny, with a high near 95. Heat index values as high as 103. West wind 8 to 11 mph, with gusts as high as 21 mph.

    Sunday Night: Mostly clear, with a low around 77. West wind 6 to 8 mph.

    Monday: Sunny and hot, with a high near 100.

    Monday Night: Mostly clear, with a low around 78.

    Tuesday: Sunny, with a high near 99.

    Tuesday Night: Partly cloudy, with a low around 77.

    Wednesday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94.

    Wednesday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.

    Thursday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.

    Thursday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.

    Friday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.



    Mountainside NJ
     40.69°N 74.37°W (Elev. 417 ft)

    Visit your local NWS office at: https://www.weather.gov/okx/