Yes

you do need a jacket based on the weather in Upland, CA, USA 1 second ago

Why? Because sorry, it's too cool for just a hoodie!
57°F14°C & Partly Cloudy

Wind is 2 mph4 km/h from the Northeast, gusting to 6 mph9 km/h
June 4
10am58°F15°C2 mph4 km/h NortheastMostly Cloudy
11am60°F16°C1 mph2 km/h SouthMostly Cloudy
12pm62°F17°C3 mph4 km/h SouthMostly Cloudy
1pm65°F19°C4 mph6 km/h SouthwestPartly Cloudy
2pm70°F21°C5 mph8 km/h SouthwestMostly Clear
3pm73°F23°C7 mph11 km/h SouthwestClear
4pm75°F24°C7 mph12 km/h SouthwestClear
5pm77°F25°C8 mph14 km/h SouthwestClear
6pm78°F25°C10 mph16 km/h SouthwestClear
7pm77°F25°C10 mph16 km/h SouthwestClear
8pm76°F24°C10 mph16 km/h WestClear
9pm73°F23°C10 mph16 km/h WestClear
DateLowHighWindDayNight
June 456°F14°C78°F25°C7 mph11 km/h from SouthwestMostly ClearMostly Clear
June 556°F13°C80°F26°C6 mph10 km/h from SouthwestClearClear
June 657°F14°C82°F28°C6 mph10 km/h from SouthwestClearMostly Clear
June 759°F15°C83°F28°C6 mph10 km/h from SouthwestClearClear
June 861°F16°C85°F29°C6 mph10 km/h from SouthwestClearClear
June 961°F16°C86°F30°C6 mph9 km/h from SouthwestClearClear
June 1061°F16°C84°F29°C6 mph10 km/h from SouthwestClearClear

Yes

Low of 55°F13°C, High of 80°F27°C
Wind: 6 mph10 km/h
Precipitation: None

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