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May 18th, 2026 :: 2:59 pm EDT   

Local Weather Report for
Saint Thomas
Ontario, Canada

 Saint Thomas Weather Forecast Summary  
 
Today
May 18th 		Tuesday
May 19th 		Wednesday
May 20th 		Thursday
May 21st 		Friday
May 22nd
Mostly Sunny Thundershowers Mostly Cloudy with Showers Mostly Sunny Mix of Cloud and Sun
26°C
 26°C
17°C		 17°C
5°C		 15°C
5°C		 15°C
5°C
 
 Saint Thomas Detailed Weather Forecast  
 
Monday, May 18th, 2026
Afternoon Temperature: 26°C
Sunny. Chance of a thunderstorm. Windy.
Evening Temperature: 21°C
Mostly clear with a chance of showers. Slight chance of a thunderstorm. Windy at times.
Tuesday, May 19th, 2026
Overnight Temperature: 18°C
A mix of cloudy and clear skies with a chance of showers. Windy at times.
Morning Temperature: 18°C
A mix of sun and cloud. Windy.
Afternoon Temperature: 26°C
A mix of cloud and sun with a chance of showers or thundershowers. Windy.
Evening Temperature: 22°C
Clear with cloudy periods with showers likely. Chance of a thunderstorm. Windy at times.
Wednesday, May 20th, 2026
Overnight Temperature: 13°C
Mostly cloudy with showers likely. Windy at times.
Morning Temperature: 10°C
Sunny. Windy at times.
Afternoon Temperature: 12°C
A mix of cloud and sun. Windy.
Evening Temperature: 7°C
A mix of cloudy and clear skies. Windy at times.
Thursday, May 21st, 2026
Overnight Temperature: 5°C
Mostly clear. Windy at times.
Morning Temperature: 9°C
Sunny with cloudy periods. Windy at times.
Afternoon Temperature: 14°C
Mostly sunny. Windy at times.
Evening Temperature: 9°C
Clear.
Friday, May 22nd, 2026
Overnight Temperature: 5°C
Clear with cloudy periods. Windy at times.
Morning Temperature: 11°C
A mix of sun and cloud. Windy.
Afternoon Temperature: 15°C
A mix of cloud and sun. Windy.
Evening Temperature: 11°C
A mix of cloudy and clear skies. Windy at times.
Saturday, May 23rd, 2026
Overnight Temperature: 10°C
Mostly cloudy. Windy at times.
Morning Temperature: 11°C
Cloudy. Windy.
Afternoon Temperature: 15°C
A mix of cloud and sun. Windy.
Evening Temperature: 12°C
Mostly cloudy. Windy.
Sunday, May 24th, 2026
Overnight Temperature: 10°C
A mix of cloudy and clear skies. Windy at times.
Morning Temperature: 12°C
Mostly cloudy. Windy at times.
Afternoon Temperature: 16°C
Cloudy. Windy at times.
Evening Temperature: 16°C
A mix of cloudy and clear skies. Windy at times.
Monday, May 25th, 2026
Overnight Temperature: 13°C
Mostly cloudy with a slight chance of showers. Windy at times.
Morning Temperature: 13°C
Cloudy with a chance of showers. Windy at times.
Afternoon Temperature: 15°C
Cloudy with a chance of showers. Windy at times.
Evening Temperature: 16°C
Cloudy with showers likely.
Tuesday, May 26th, 2026
Overnight Temperature: 16°C
Cloudy with a slight chance of showers.
Morning Temperature: 18°C
Cloudy with a slight chance of showers. Windy at times.
Afternoon Temperature: 21°C
Cloudy with a chance of showers or thundershowers. Windy at times.
Evening Temperature: 17°C
Cloudy with a chance of showers.



 

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This WeatherCity Weather Forecast for Saint Thomas, Ontario, Canada is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office
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