Yes

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

Why? Because it's windy enough to give you a brand new hairdo!
84°F29°C & Clear

Wind is 13 mph21 km/h from the Northwest, gusting to 22 mph35 km/h
July 27
3pm84°F29°C13 mph22 km/h NorthwestClear
4pm83°F28°C14 mph22 km/h NorthwestClear
5pm82°F28°C13 mph21 km/h NorthwestClear
6pm81°F27°C12 mph19 km/h NorthwestClear
7pm80°F27°C11 mph17 km/h NorthwestClear
8pm78°F25°C8 mph13 km/h NorthwestClear
9pm75°F24°C6 mph9 km/h NorthwestClear
10pm73°F23°C5 mph8 km/h NorthwestClear
11pm71°F22°C5 mph8 km/h NorthwestClear
July 28
12am70°F21°C4 mph7 km/h NorthwestClear
1am69°F20°C4 mph6 km/h NorthwestClear
2am68°F20°C3 mph4 km/h NorthwestClear
DateLowHighWindDayNight
July 2770°F21°C84°F29°C10 mph16 km/h from NorthwestMostly ClearClear
July 2866°F19°C90°F32°C8 mph12 km/h from SouthwestMostly ClearMostly Clear
July 2969°F21°C84°F29°C7 mph11 km/h from NorthwestMostly CloudyRain
July 3064°F18°C79°F26°C9 mph14 km/h from NorthwestPartly CloudyMostly Cloudy
July 3160°F15°C75°F24°C8 mph13 km/h from NorthMostly ClearClear
August 155°F13°C73°F23°C7 mph12 km/h from NorthMostly ClearClear
August 255°F13°C76°F25°C5 mph9 km/h from NorthwestMostly ClearClear

No

Low of 65°F19°C, High of 90°F32°C
Wind: 8 mph12 km/h
Precipitation: None

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