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Mountainside, NJ 7-Day Night Weather Forecast
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Mountainside, NJ Weather Forecast
Mountainside, NJ Weather Forecast Date: 229 PM EDT Fri Sep 11 2026
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This Afternoon... Mostly sunny. Near steady temperature in the lower 80s. Northwest winds around 5 mph.
Tonight... Mostly clear. Patchy fog after midnight. Lows in the upper 50s. North winds around 5 mph.
Saturday... Patchy fog in the morning. Mostly sunny. Highs in the lower 80s. East winds around 5 mph, becoming southeast in the afternoon.
Saturday Night... Mostly cloudy. Showers likely with a slight chance of thunderstorms after midnight. Some thunderstorms May produce heavy rainfall after midnight. Lows in the upper 60s. Southeast winds 5 to 10 mph. Chance of rain 70%.
Sunday... Showers with a slight chance of thunderstorms. Some thunderstorms May produce heavy rainfall. Humid with highs in the lower 80s. South winds around 5 mph, becoming west around 5 mph in the afternoon. Chance of rain 90%.
Sunday Night... Partly cloudy. Lows in the mid 60s.
Monday... Sunny. Highs in the mid 70s.
Monday Night... Mostly clear. Lows in the mid 50s.
Tuesday... Sunny. Highs in the lower 70s.
Tuesday Night... Mostly clear. Lows in the upper 50s.
Wednesday... Sunny. Highs in the upper 70s.
Wednesday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 60s.
Thursday... Partly sunny. A chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 30%.
Thursday Night... Mostly cloudy in the evening, then becoming partly cloudy. A 30% chance of showers. Lows in the lower 60s.
POP = Probability of Precipitation
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