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Heffernan, PA Weather Forecast
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Heffernan Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Partly Sunny | Showers Likely | Showers | Chance of T-Storm | Chance of Showers | Chance of Showers | Sunny | Mostly Clear | Sunny | Mostly Clear |
| Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C |
| POP: 90% | POP: 70% | POP: 60% | POP: 70% | POP: 70% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 400 AM EDT Thu Aug 20 2026 
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Heffernan Forecast Discussion
Issued: 428 AM EDT Thu Aug 20 2026
Key Messages
1. A strong cold front is expected to cross through the region today, resulting in widespread showers and thunderstorms. Flash flooding, damaging wind gusts and a few 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...A strong cold front is expected to cross through the regio...