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Grantsville Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | MONDAY | TUESDAY |
 |  |  |  |  | | | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Sunny |
| Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C |
| POP: 20% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 748 AM EDT Wed Sep 23 2026 
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Issued: 531 AM EDT Wed Sep 23 2026
Key Messages
1.) Localized flash flooding threat from slow-moving showers and thunderstorms continues through this evening, primarily across the southern coalfields.
2.) Transition to dry, seasonable autumn weather Thursday through the weekend as cooler air advects from eastern Canada, bringing daytime highs in the 70s and crisp nighttime lows in the 40s and 50s.
Discussion
... KEY MESSAGE 1...
A weak upper-level cold-core low will drift slowly southward across the Ohio Valley today into the Tennesse...