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Arthur School Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  |  |  |  |  | |  | |  | | |
| Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Cloudy | Cloudy | Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Cloudy |
| Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 61°FHi: 16°C | Lo: 51°FLo: 11°C | Hi: 61°FHi: 16°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C |
| POP: 30% | POP: 90% | POP: 90% | POP: 70% | POP: 50% | POP: 50% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 333 PM EDT Fri Sep 18 2026 
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Issued: 342 PM EDT Fri Sep 18 2026
Key Messages
- Increasing clouds into this evening.
- Several rounds of showers and embedded thunderstorms are likely Saturday, Saturday night, and Sunday.
- A cool and cloudy pattern is expected through early next week.
Discussion
...
Cooler north-northeasterly flow on the south end of a surface high pressure migrating across Ontario and into Quebec tonight will ensure more stable conditions locally. Limited cloud cover exists this afternoon with the flow supplying a good amount of lower level dry air. T...