Mountainside, NJ Weather Forecast

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Mountainside, NJ Weather Forecast

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Mountainside NJ weather  - Mostly Clear - 78°F
Mostly Clear
78°F
Updated 4:22 pm
Feels Like 85°F
Humidity 41%
Wind NW 10 mph
Barometer  29.98 in
Dew Point 53°F
Mountainside NJ weather  - Mostly Clear - 26°C
Mostly Clear
26°C
Updated 4:22 pm
Feels Like 30°C
Humidity 41%
Wind NW 16 km/h
Barometer  101.5 kPa
Dew Point 12°C

Mountainside Weather Forecast

THIS AFTERNOON TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT
Mountainside, NJ Weather - This Afternoon Mostly Sunny Mountainside, NJ Weather - Tonight Patchy Fog Mountainside, NJ Weather - Saturday Patchy Fog Mountainside, NJ Weather - Saturday Night Chance Of T-Storm Mountainside, NJ Weather - Sunday Chance Of T-Storm Mountainside, NJ Weather - Sunday Night Partly Cloudy Mountainside, NJ Weather - Monday Sunny Mountainside, NJ Weather - Monday Night Mostly Clear Mountainside, NJ Weather - Tuesday Sunny Mountainside, NJ Weather - Tuesday Night Mostly Clear Mountainside, NJ Weather - Wednesday Sunny Mountainside, NJ Weather - Wednesday Night Partly Cloudy
Mostly Sunny Patchy Fog Patchy Fog Chance of T-Storm Chance of T-Storm Partly Cloudy Sunny Mostly Clear Sunny Mostly Clear Sunny Partly Cloudy
Hi: 81°FHi: 27°C
Lo: 59°FLo: 15°C Hi: 81°FHi: 27°C
Lo: 69°FLo: 21°C Hi: 81°FHi: 27°C
Lo: 65°FLo: 18°C Hi: 75°FHi: 24°C
Lo: 55°FLo: 13°C Hi: 71°FHi: 22°C
Lo: 59°FLo: 15°C Hi: 79°FHi: 26°C
Lo: 61°FLo: 16°C
POP: 70% POP: 90%
POP = Probability of Precipitation.
Weather Outlook Updated: 229 PM EDT Fri Sep 11 2026 Mountainside, NJ Weather - WeatherWorld.com

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Mountainside Forecast Discussion

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Issued: 356 PM EDT Fri Sep 11 2026

Key Messages

1) Dry and seasonably warm Saturday.

2) Showers expected Saturday Night into Sunday Morning. A period of heavy downpours and isolated thunderstorms are possible, with a a threat for localized flash flooding.

3) Dry and seasonable conditions early to mid next week.


Discussion

... .KEY MESSAGE 1...

High pressure will remain over the region tonight and slide offshore during the day on Saturday. With high pressure over the region, expect good radiational cooling conditions tonight with mostly...