Yes

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

Why? Because there are strong winds blowing out there!
71°F22°C & Windy

Wind is 16 mph25 km/h from the SW, gusting to 25 mph41 km/h
October 6
3pm72°F22°C15 mph24 km/h SWWindy
4pm74°F23°C15 mph24 km/h SWMostly Clear
5pm73°F23°C14 mph23 km/h WClear
6pm70°F21°C13 mph21 km/h WClear
7pm67°F19°C12 mph19 km/h WMostly Clear
8pm64°F18°C13 mph20 km/h WClear
9pm60°F16°C14 mph23 km/h NWClear
10pm58°F14°C13 mph21 km/h NWClear
11pm56°F13°C11 mph18 km/h NWMostly Clear
October 7
12am54°F12°C10 mph15 km/h NWMostly Clear
1am53°F12°C9 mph15 km/h NWMostly Clear
2am52°F11°C10 mph16 km/h NWPartly Cloudy
DateLowHighWindDayNight
October 652°F11°C74°F23°C16 mph25 km/h from SWWindyMostly Clear
October 747°F8°C61°F16°C12 mph20 km/h from NWPartly CloudyMostly Clear
October 843°F6°C59°F15°C11 mph17 km/h from NWPartly CloudyMostly Clear
October 941°F5°C58°F15°C13 mph21 km/h from NWMostly ClearMostly Clear
October 1039°F4°C61°F16°C5 mph9 km/h from NMostly ClearClear
October 1144°F7°C70°F21°C12 mph19 km/h from SWMostly ClearPartly Cloudy
October 1254°F12°C71°F22°C12 mph19 km/h from WPartly CloudyMostly Cloudy

Yes

Low of 47°F9°C, High of 62°F17°C
Wind: 12 mph20 km/h
Precipitation: None

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