forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Mon Jun 22 2026 |
| Today: Mainly cloudy. 30 percent chance of showers late this afternoon. High 24. Humidex 29. Uv index 8 or very high. Tonight: Partly cloudy. 30 percent chance of showers this evening and after midnight. Fog patches developing overnight. Low 13. Tuesday: Cloudy. Becoming a mix of sun and cloud in the morning. Fog patches dissipating in the morning. High 25. Humidex 28. Uv index 8 or very high. Tuesday Night: Clear. Low 13. Wednesday: Sunny. High 25. Wednesday Night: Cloudy periods. Low 13. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 26. Thursday Night: Cloudy with 60 percent chance of showers. Low 14. Friday: Cloudy with 30 percent chance of showers. High 22. Friday Night: Cloudy periods. Low 15. Saturday: Cloudy. High 24. Saturday Night: Cloudy periods. Low 15. Sunday: A mix of sun and cloud. High 28. |
regional radar

Cornwall
Rain Snow Ice Mix














