Yes

you do need a jacket based on the weather in St Thomas, ON, Canada 1 second ago

Why? Because the wind could blow a wig clean off your head!
87°F30°C & Mostly Clear

Wind is 14 mph22 km/h from the South, gusting to 23 mph37 km/h
July 12
3pm87°F31°C14 mph22 km/h SouthClear
4pm87°F31°C13 mph21 km/h SouthClear
5pm87°F31°C13 mph21 km/h SouthMostly Clear
6pm86°F30°C11 mph18 km/h SouthMostly Clear
7pm84°F29°C11 mph18 km/h SouthMostly Clear
8pm81°F27°C12 mph19 km/h SouthMostly Clear
9pm79°F26°C8 mph13 km/h SouthMostly Clear
10pm77°F25°C9 mph14 km/h SouthwestPartly Cloudy
11pm76°F24°C9 mph15 km/h SouthwestMostly Cloudy
July 13
12am75°F24°C9 mph14 km/h SouthwestThunderstorms
1am74°F23°C8 mph12 km/h SouthwestPartly Cloudy
2am73°F23°C6 mph10 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
July 1271°F22°C87°F31°C11 mph17 km/h from SouthClearThunderstorms
July 1370°F21°C82°F28°C7 mph12 km/h from WestPartly CloudyPartly Cloudy
July 1467°F19°C84°F29°C6 mph10 km/h from WestMostly ClearClear
July 1563°F17°C85°F30°C6 mph9 km/h from SouthMostly ClearPartly Cloudy
July 1669°F20°C84°F29°C6 mph10 km/h from SouthPartly CloudyThunderstorms
July 1771°F22°C84°F29°C10 mph16 km/h from SouthwestThunderstormsDrizzle
July 1868°F20°C78°F25°C11 mph18 km/h from NorthwestMostly CloudyPartly Cloudy

No

Low of 70°F21°C, High of 82°F28°C
Wind: 7 mph12 km/h
Precipitation: 26% rain

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