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Mountainside, NJ 7-Day Night Weather Forecast
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Mountainside, NJ Weather Forecast
Mountainside, NJ Weather Forecast Date: 223 AM EDT Sat Sep 12 2026
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Today... Mostly sunny. Highs around 80. East winds around 5 mph, becoming southeast with gusts up to 20 mph this afternoon.
Tonight... Mostly cloudy. Showers with a chance of thunderstorms after midnight. Lows in the mid 60s. Southeast winds 5 to 10 mph. Chance of rain 90%.
Sunday... Cloudy with showers with a slight chance of thunderstorms in the morning, then mostly sunny with a slight chance of showers and thunderstorms in the afternoon. Locally heavy rainfall possible in the morning. Humid with highs around 80. Southwest winds around 5 mph, becoming northwest around 5 mph in the afternoon. Chance of rain 90%.
Sunday Night... Partly cloudy in the evening, then partly cloudy with a slight chance of showers after midnight. Humid with lows in the mid 60s. West winds around 5 mph. Chance of rain 20%.
Monday... Partly sunny. A slight chance of showers in the morning. Less humid with highs in the mid 70s. Northwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20%.
Monday Night... Mostly clear. Lows in the mid 50s.
Tuesday... Sunny. Highs in the lower 70s.
Tuesday Night... Partly cloudy. Lows in the upper 50s.
Wednesday... Sunny. Highs around 80.
Wednesday Night... Mostly clear. Lows in the lower 60s.
Thursday... Mostly sunny. Highs in the lower 80s.
Thursday Night... Partly cloudy. Lows in the mid 60s.
POP = Probability of Precipitation
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