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Tar Run Reservoir Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Chance of T-Storm | Sunny | Mostly Clear | Sunny | Partly Cloudy | Chance of Showers | Chance of Showers | Mostly Sunny | Chance of Showers | Showers Likely | Showers Likely | Chance of Showers |
| Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C |
| POP: 50% | POP: 50% | POP: 50% | POP: 40% | POP: 60% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 730 PM EDT Mon Aug 17 2026 
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Tar Run Reservoir Forecast Discussion
Issued: 756 PM EDT Mon Aug 17 2026
Key Messages
1) Numerous showers ahead of a cold front will die off as we lose the heating of the sun.
2) An unsettled but not particularly wet period is expected mid to late week.
Discussion
... KEY MESSAGE 1: Numerous showers ahead of a cold front will die off as we lose the heating of the sun.
The cold front is advancing through northern PA showing up as thin line of shallow convectionm at 3 PM. The air behind the front is not all that dry, but enough of a change shou...