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Johnstown Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
 |  |  |  |  |  | |  |  |  | |  |
| Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Sunny | Chance of T-Storm | Showers | Showers Likely | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°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 |
| POP: 50% | POP: 50% | POP: 70% | POP: 70% | POP: 70% | POP: 40% | POP: 30% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 315 PM EDT Wed Sep 16 2026 
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Issued: 305 PM EDT Wed Sep 16 2026
Key Messages
1) Heat and humidity continue through Thursday, with occasional chances for storms through the forecast period.
Discussion
... KEY MESSAGE 1)
The center of a large mid level ridge remains over the TN Valley today. ILN/s area is in the warm and moist airmass with PWAT values around 2 inches. Surface dewpoints in the lower and middle 70s and highs from the mid 80s north to the lower 90s south. This will result in maximum heat indices of 95 to around 100 across the south.
Morning convection...