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St. Catharines School Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  | | | |  |  | | |  |  | |
| Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C |
| POP: 30% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 404 PM EDT Sat Aug 29 2026 
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Meteorlogic Glosserator
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Instant definitions for any meteorological term.
Issued: 757 PM EDT Sat Aug 29 2026
Key Messages
1) There will be an extended dry stretch with warming temperatures.
Discussion
... KEY MESSAGE 1) High pressure shifts to the east of the region tonight and will settle over the western Atlantic into early next week. This pattern will set the stage for a gradual warming trend into midweek. Each day, humidity values slowly climb, presenting the opportunity for growing heat stress into early September.
Before the warmest temperatures arrive, a weak upper level trough will be present over ...