Observed at: Sarnia Chris Hadfield Airport 9:00 AM EDT Monday 20 May 2013
Issued: 5:00 AM EDT Monday 20 May 2013
| A mix of sun and cloud. 40 percent chance of showers late this afternoon with risk of a thunderstorm. Wind becoming south 20 km/h this afternoon. High 28. UV index 8 or very high. |
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| Partly cloudy. 40 percent chance of showers this evening with risk of a thunderstorm. Wind south 20 km/h becoming light after midnight. Low 18. |
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| Cloudy. Showers beginning in the morning and ending late in the evening. Risk of a thunderstorm in the morning and afternoon and early evening. Wind becoming southwest 30 km/h in the morning. High 24. |
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| Showers. Low 16. High 23. |
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| Showers. Low 12. High 17. |
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| Sunny. Low 7. High 17. |
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| Sunny. Low 7. High 16. |
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| Sunny. Low 7. High 15. |
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