Weather World
City of Johnstown, PAJohnstown, PA Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Johnstown Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  |  |  | |  | |  | | |
| Chance of T-Storm | Patchy Fog | Partly Cloudy | Partly Sunny | Showers Likely | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Showers Likely | Showers | Showers | Chance of Showers |
| Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C | Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 59°FHi: 15°C | Lo: 49°FLo: 9°C | Hi: 59°FHi: 15°C |
| POP: 40% | POP: 70% | POP: 100% | POP: 90% | POP: 50% | POP: 70% | POP: 70% | POP: 70% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 430 PM EDT Thu Sep 17 2026 
Johnstown Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Johnstown Weather Map
Johnstown Quick Facts
Johnstown Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 221 PM EDT Thu Sep 17 2026
Key Messages
1) Very humid with locally heavy rainfall possible this afternoon
2) Cooler this weekend with rain returning by Sunday
Discussion
... KEY MESSAGE 1: Very humid with locally heavy rainfall possible this afternoon
Morning rounds of rain have slid off to the southeast with only isolated showers in the northern tier of counties across our CWA. Afternoon coverage of showers and thunderstorms remains uncertain, but with additional convection beginning to develop to our west over Pittsburg`s ar...