Weather World
St. Clair, OH Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
St. Clair Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  | |  |  |  | | | | | | |
| Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Sunny |
| Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 80°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C |
| POP: 90% | POP: 90% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 404 PM EDT Mon Sep 07 2026 
St. Clair Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
St. Clair Weather Map
St. Clair Quick Facts
St. Clair Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 209 PM EDT Mon Sep 7 2026
Key Messages
1) Dry conditions with warming temperatures into Wednesday.
2) A cold front will move into the area Wednesday night, only making slow southward progress through Thursday. This will bring showers and thunderstorms, possibly with some locally heavy rainfall.
Discussion
... KEY MESSAGE 1) High pressure centered over the eastern Great Lakes will continue to translate eastward tonight into tomorrow. As this occurs, low level flow will turn and become southerly on Tuesday. Meanwhile, mid leve...