Derry, PA Weather Forecast
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| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
| Mostly Cloudy | Chance of Showers | Chance of Showers | Mostly Cloudy | Patchy Fog | Mostly Cloudy | Patchy Fog | Patchy Fog | Mostly Cloudy | Partly Sunny | Chance of Showers | Chance of Showers |
| Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°C |
| POP: 20% | POP: 40% | POP: 40% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 502 PM EDT Sat Sep 26 2026 

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Issued: 151 PM EDT Sat Sep 26 2026
Key Messages
1) Little impacts from the nor`easter through Monday 2) Continued dry stretch of weather before a late week front returns precipitation, while above normal temperatures come back.
Discussion
... KEY MESSAGE 1... Sunday and Monday will feature much more in the way of cloud cover than the past two days as mid and upper level moisture associated with the Nor`easter moves westward. As of now, there is a low chance /<25%/ of measurable precipitation mainly east of I-79. Can not rule out sprinkles as far west as I-77 Sunday night into Monday.
This won`t be a washout in any area, but with mostly cloudy to an overcast ...
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