No

you don't need a jacket based on the weather in Provo, UT, USA 14 minutes ago

69°F21°C & Cloudy

Wind is 4 mph6 km/h from the East, gusting to 5 mph8 km/h
September 19
12am68°F20°C3 mph4 km/h SoutheastMostly Cloudy
1am65°F18°C2 mph4 km/h EastCloudy
2am64°F18°C1 mph2 km/h EastCloudy
3am63°F17°C4 mph7 km/h SoutheastCloudy
4am62°F16°C2 mph3 km/h EastCloudy
5am59°F15°C3 mph5 km/h SoutheastCloudy
6am59°F15°C4 mph6 km/h EastMostly Cloudy
7am58°F15°C3 mph6 km/h EastCloudy
8am57°F14°C4 mph7 km/h EastCloudy
9am58°F15°C5 mph9 km/h EastCloudy
10am60°F16°C5 mph7 km/h EastCloudy
11am63°F17°C3 mph5 km/h SoutheastCloudy
DateLowHighWindDayNight
September 1850°F10°C80°F27°C3 mph5 km/h from WestClearCloudy
September 1957°F14°C78°F26°C4 mph6 km/h from SouthwestCloudyPartly Cloudy
September 2058°F14°C76°F25°C4 mph6 km/h from SouthwestPartly CloudyMostly Clear
September 2157°F14°C76°F24°C4 mph7 km/h from WestMostly ClearPartly Cloudy
September 2254°F12°C74°F24°C5 mph8 km/h from NorthwestMostly ClearClear
September 2349°F10°C80°F26°C3 mph5 km/h from WestClearClear
September 2453°F12°C82°F28°C3 mph5 km/h from WestMostly ClearMostly Clear

Yes

Low of 57°F14°C, High of 78°F26°C
Wind: 4 mph6 km/h
Precipitation: None

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