Yes

you do need a jacket based on the weather in St. George, UT, USA 1 second ago

Why? Because it's pretty chilly!
52°F11°C & Partly Cloudy

Wind is 4 mph7 km/h from the Northeast, gusting to 6 mph10 km/h
October 26
2pm52°F11°C5 mph8 km/h NortheastPartly Cloudy
3pm54°F12°C3 mph5 km/h NortheastMostly Cloudy
4pm61°F16°C2 mph4 km/h EastMostly Cloudy
5pm67°F19°C5 mph8 km/h EastMostly Cloudy
6pm71°F21°C4 mph6 km/h EastMostly Clear
7pm74°F23°C2 mph3 km/h NortheastPartly Cloudy
8pm76°F25°C4 mph6 km/h WestMostly Clear
9pm77°F25°C6 mph9 km/h WestClear
10pm78°F26°C8 mph13 km/h WestClear
11pm78°F25°C8 mph13 km/h WestClear
October 27
12am76°F24°C6 mph10 km/h WestMostly Clear
1am72°F22°C3 mph6 km/h NorthwestMostly Clear
DateLowHighWindDayNight
October 2652°F11°C78°F26°C5 mph8 km/h from WestMostly ClearClear
October 2750°F10°C80°F27°C5 mph8 km/h from NorthwestClearClear
October 2844°F6°C73°F23°C2 mph4 km/h from NortheastClearClear
October 2944°F6°C75°F24°C2 mph3 km/h from NorthClearClear
October 3045°F7°C77°F25°C1 mph2 km/h from NorthClearPartly Cloudy
October 3146°F8°C78°F25°C2 mph3 km/h from SouthwestClearMostly Clear
November 147°F8°C78°F25°C1 mph2 km/h from SouthClearClear

Yes

Low of 50°F10°C, High of 80°F27°C
Wind: 5 mph8 km/h
Precipitation: None

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