Observed at: St. Catharines Airport 9:00 PM EDT Saturday 18 May 2013
Issued: 3:30 PM EDT Saturday 18 May 2013
| Partly cloudy. Wind northeast 20 km/h becoming light this evening. Low 11. |
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| A mix of sun and cloud. 30 percent chance of showers in the afternoon with risk of thunderstorms. Wind becoming south 20 km/h late in the afternoon. High 19. UV index 8 or very high. |
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| Partly cloudy. 30 percent chance of showers early in the evening. Wind south 20 km/h. Low 16. |
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| A mix of sun and cloud with 40 percent chance of showers. High 27. |
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| Cloudy with 60 percent chance of showers. Low 16. High 21. |
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| Showers. Low 14. High 21. |
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| Cloudy with 60 percent chance of showers. Low 13. High 15. |
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| Cloudy with 60 percent chance of showers. Low 12. High 15. |
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