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William Birch Park, NJ Weather Forecast
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William Birch Park Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  | | | |  |  | | | |  |
| Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Partly Cloudy | Sunny | Partly Cloudy | Sunny | Mostly Clear |
| Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C |
| POP: 50% | POP: 90% | POP: 50% | POP: 70% | POP: 70% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 225 AM EDT Tue Sep 01 2026 
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Issued: 342 AM EDT Tue Sep 1 2026
Key Messages
1) Isolated to scattered strong to severe thunderstorms late this afternoon into early this evening across much of the area. Greatest threat will be across western LI, SW CT, NYC, NE NJ, and the Lower Hudson Valley.
2) After a lull in shower and thunderstorm activity Wednesday, more showers and thunderstorms forecast Wednesday night through Thursday night.
3) Drier conditions expected for the holiday weekend.
Discussion
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.KEY MESSAGE 1... Warm advection showers across the area this mor...