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Johnstown School Weather Forecast
| REST OF TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  |  |  | | | | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of Showers | Partly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Chance of T-Storm | Mostly Sunny | Chance of Showers | Mostly Sunny |
| Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C |
| POP: 30% | POP: 30% | POP: 20% | POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 957 PM EDT Sat Aug 29 2026 
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Issued: 733 PM EDT Sat Aug 29 2026
Key Messages
- Becoming Hot and Humid
- Rain Chances Increase Tonight into Sunday
- Additional Chances for Rain and Thunderstorms Next Week
Discussion
... Issued at 216 PM EDT Sat Aug 29 2026- Becoming Hot and Humid
An upper-level high will develop over the southern CONUS and migrate toward the southeast CONUS by midweek. Southwesterly low- level flow from the southern plains will transport 850 mb temperatures around 20 C over Lower Michigan from late Sunday through Tuesday or Wednesday. At the surface, a ...