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City of Mount Vernon, OHMount Vernon, OH Weather Forecast
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Mount Vernon Weather Forecast
| REST OF TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  |  |  | | |  | | |  |
| Showers | Chance of T-Storm | Chance of T-Storm | Showers Likely | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Showers | Showers Likely | Mostly Cloudy | Mostly Cloudy | Partly Cloudy |
| Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C |
| POP: 70% | POP: 70% | POP: 50% | POP: 60% | POP: 70% | POP: 70% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 232 AM EDT Sun Sep 20 2026 
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Instant definitions for any meteorological term.
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Issued: 221 AM EDT Sun Sep 20 2026
Key Messages
1) Several rounds of rain with some embedded thunderstorms are expected through Sunday evening, bring some potential for heavy rainfall and localized flooding. The best chances for flooding will be areas further south and west.
2) A cool, fall pattern will develop for the bulk of the week with some intermittent rain chances, especially on Tuesday and Wednesday.
Discussion
... KEY MESSAGE 1... With a warm front over the area, several mid-level shortwaves will move through the region alon...