Yes

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

Why? Because it's quite chilly.
35°F2°C & Clear

Wind is 12 mph20 km/h from the NW, gusting to 27 mph43 km/h
March 19
4am33°F1°C12 mph20 km/h NWClear
5am32°F0°C12 mph19 km/h NWClear
6am31°F-1°C10 mph17 km/h NWClear
7am30°F-1°C8 mph13 km/h NWClear
8am30°F-1°C7 mph11 km/h NWClear
9am33°F1°C7 mph11 km/h NWClear
10am37°F3°C7 mph11 km/h NWClear
11am42°F5°C6 mph9 km/h NWClear
12pm46°F8°C5 mph8 km/h NWClear
1pm51°F10°C6 mph10 km/h WClear
2pm54°F12°C8 mph12 km/h WClear
3pm56°F13°C9 mph15 km/h WClear
DateLowHighWindDayNight
March 1930°F-1°C59°F15°C8 mph13 km/h from WClearClear
March 2039°F4°C70°F21°C9 mph14 km/h from WClearPartly Cloudy
March 2146°F8°C71°F22°C4 mph7 km/h from EMostly CloudyCloudy
March 2249°F9°C57°F14°C11 mph18 km/h from ERainDrizzle
March 2346°F8°C68°F20°C11 mph17 km/h from NPartly CloudyClear
March 2444°F7°C69°F21°C7 mph11 km/h from EClearPartly Cloudy
March 2544°F6°C64°F18°C11 mph17 km/h from ECloudyCloudy

Yes

Low of 39°F4°C, High of 70°F21°C
Wind: 9 mph14 km/h
Precipitation: None

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