Yes

you do need a jacket based on the weather in Johns Creek, GA, USA 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's so windy, your hat will probably launch into orbit!
51°F11°C & Windy

Wind is 15 mph24 km/h from the Northwest, gusting to 31 mph50 km/h
March 17
1am49°F9°C14 mph23 km/h NorthwestMostly Clear
2am47°F8°C14 mph23 km/h NorthwestPartly Cloudy
3am45°F7°C14 mph22 km/h NorthwestPartly Cloudy
4am44°F7°C13 mph21 km/h NorthwestPartly Cloudy
5am42°F6°C13 mph20 km/h NorthwestMostly Clear
6am41°F5°C13 mph21 km/h NorthwestClear
7am40°F4°C12 mph20 km/h NorthwestClear
8am39°F4°C12 mph19 km/h NorthwestClear
9am40°F4°C13 mph21 km/h NorthwestClear
10am42°F5°C15 mph24 km/h NorthwestMostly Clear
11am44°F7°C15 mph24 km/h NorthwestMostly Clear
12pm47°F9°C15 mph24 km/h NorthwestWindy
DateLowHighWindDayNight
March 1739°F4°C58°F14°C13 mph22 km/h from NorthwestClearClear
March 1841°F5°C71°F22°C5 mph8 km/h from WestClearMostly Clear
March 1947°F8°C74°F24°C8 mph13 km/h from SouthPartly CloudyRain
March 2040°F5°C61°F16°C15 mph25 km/h from NorthwestWindyMostly Clear
March 2133°F1°C63°F17°C5 mph7 km/h from SouthwestMostly ClearClear
March 2242°F5°C66°F19°C9 mph14 km/h from SouthwestMostly ClearMostly Clear
March 2344°F7°C69°F21°C5 mph8 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 41°F5°C, High of 72°F22°C
Wind: 5 mph8 km/h
Precipitation: None

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