Weather WorldWeir Lake, PA Weather Forecast
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Weir Lake Weather Forecast
| OVERNIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  |  |  | | |  | | | |
| Chance of Showers | Mostly Sunny | Partly Cloudy | Showers Likely | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Sunny |
| Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C |
| POP: 20% | POP: 60% | POP: 60% | POP: 60% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 909 PM EDT Thu Aug 20 2026 
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Weir Lake Forecast Discussion
Issued: 918 PM EDT Thu Aug 20 2026
Key Messages
1. A cold front will cross the region this evening, resulting in widespread showers and thunderstorms. Flash flooding, damaging wind gusts and tornadoes are possible later today.
2. Conditions look to remain unsettled through the weekend, with daily chances of showers and storms each day.
3. Fair weather is expected to return for early next week.
Discussion
... KEY MESSAGE 1... Strong winds behind the convective activity appear to be in the wake of the two s...