Yes

you do need a jacket based on the weather in Phoenix, AZ, USA 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
56°F13°C & Clear

Wind is 4 mph6 km/h from the East, gusting to 6 mph10 km/h
November 8
3pm58°F15°C3 mph5 km/h EastClear
4pm64°F18°C4 mph7 km/h EastClear
5pm70°F21°C4 mph7 km/h EastClear
6pm75°F24°C3 mph5 km/h EastClear
7pm78°F26°C2 mph4 km/h EastClear
8pm81°F27°C1 mph2 km/h SoutheastClear
9pm83°F28°C2 mph3 km/h SouthwestClear
10pm84°F29°C2 mph4 km/h WestClear
11pm84°F29°C3 mph5 km/h WestClear
November 9
12am82°F28°C3 mph5 km/h WestClear
1am78°F26°C3 mph5 km/h WestMostly Clear
2am76°F24°C3 mph4 km/h WestClear
DateLowHighWindDayNight
November 856°F13°C84°F29°C3 mph5 km/h from SoutheastClearClear
November 959°F15°C88°F31°C4 mph7 km/h from EastClearClear
November 1061°F16°C87°F30°C4 mph7 km/h from EastClearMostly Clear
November 1158°F15°C83°F28°C3 mph4 km/h from SoutheastPartly CloudyMostly Clear
November 1258°F15°C82°F28°C3 mph4 km/h from EastPartly CloudyMostly Cloudy
November 1360°F16°C80°F27°C3 mph5 km/h from SoutheastMostly CloudyMostly Cloudy
November 1460°F16°C69°F20°C4 mph7 km/h from SouthMostly CloudyMostly Cloudy

Yes

Low of 58°F15°C, High of 88°F31°C
Wind: 4 mph7 km/h
Precipitation: None

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