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Borough of Mechanicsburg, PAMechanicsburg, PA Weather Forecast
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Mechanicsburg Weather Forecast
| OVERNIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Patchy Fog | 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 | Chance of Showers |
| Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C |
| POP: 70% | POP: 70% | POP: 40% | POP: 40% | POP: 40% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1030 PM EDT Mon Aug 17 2026 
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Mechanicsburg 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...