Yes

you do need a jacket based on the weather in Niagara Falls, ON, Canada 2 seconds ago

Why? Because the wind is harsh and biting!
80°F27°C & Windy

Wind is 15 mph24 km/h from the Southwest, gusting to 24 mph39 km/h
August 23
3pm80°F27°C15 mph24 km/h SouthwestWindy
4pm80°F26°C15 mph24 km/h SouthwestCloudy
5pm79°F26°C14 mph23 km/h SouthwestCloudy
6pm77°F25°C12 mph20 km/h SouthwestCloudy
7pm76°F25°C10 mph17 km/h SouthwestCloudy
8pm74°F23°C7 mph12 km/h SouthwestCloudy
9pm72°F22°C7 mph12 km/h SouthwestCloudy
10pm71°F22°C8 mph12 km/h SouthwestCloudy
11pm70°F21°C8 mph12 km/h SouthwestCloudy
August 24
12am69°F21°C7 mph11 km/h SouthwestCloudy
1am69°F20°C7 mph12 km/h SouthwestCloudy
2am68°F20°C7 mph12 km/h SouthwestDrizzle
DateLowHighWindDayNight
August 2362°F17°C80°F27°C10 mph16 km/h from SouthwestMostly CloudyMostly Cloudy
August 2464°F18°C77°F25°C9 mph15 km/h from SouthwestMostly ClearMostly Clear
August 2558°F15°C70°F21°C10 mph17 km/h from WestPartly CloudyPartly Cloudy
August 2655°F13°C68°F20°C10 mph15 km/h from WestPartly CloudyMostly Clear
August 2753°F12°C71°F22°C8 mph12 km/h from WestMostly ClearPartly Cloudy
August 2856°F13°C72°F22°C12 mph20 km/h from SouthwestMostly CloudyDrizzle
August 2958°F14°C69°F21°C8 mph13 km/h from NorthwestDrizzlePartly Cloudy

No

Low of 64°F18°C, High of 77°F25°C
Wind: 9 mph15 km/h
Precipitation: 15% rain

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