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Lancaster Jaycee Park Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Sunny | Mostly Clear | Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C | Lo: 65°FLo: 18°C |
| POP: 40% | POP: 40% | POP: 60% | POP: 60% | POP: 40% | POP: 50% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 430 AM EDT Mon Aug 17 2026 
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Lancaster Jaycee Park Forecast Discussion
Issued: 812 PM EDT Sun Aug 16 2026
Key Messages
1) Severe thunderstorms should be almost done. Flash flooding threat may persist, but is likely done, too.
2) High pressure yields a short dry window for late Monday afternoon through Wednesday morning, before more storms arrive Wednesday afternoon into Thursday.
Discussion
... KEY MESSAGE 1: Severe thunderstorms should be almost done. Flash flooding threat may persist, but is likely done, too.
The bow has hit the more-stable air over the Lower Susq Valley. ...