Yes

you do need a jacket based on the weather in Perris, CA, 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 1 mph2 km/h from the Northwest, gusting to 2 mph3 km/h
October 21
12pm56°F14°C2 mph3 km/h NorthwestClear
1pm56°F13°C1 mph2 km/h SouthwestClear
2pm55°F13°C1 mph1 km/h EastClear
3pm57°F14°C1 mph2 km/h NorthClear
4pm64°F18°C1 mph1 km/h SoutheastPartly Cloudy
5pm71°F22°C1 mph1 km/h SouthPartly Cloudy
6pm78°F26°C1 mph2 km/h NorthwestPartly Cloudy
7pm82°F28°C2 mph4 km/h SouthwestPartly Cloudy
8pm83°F29°C4 mph6 km/h SouthwestPartly Cloudy
9pm84°F29°C5 mph7 km/h SouthwestMostly Clear
10pm85°F29°C4 mph7 km/h WestMostly Clear
11pm83°F29°C5 mph8 km/h WestMostly Clear
DateLowHighWindDayNight
October 2155°F13°C85°F29°C3 mph5 km/h from WestMostly ClearPartly Cloudy
October 2254°F12°C72°F22°C5 mph8 km/h from WestMostly ClearPartly Cloudy
October 2352°F11°C77°F25°C4 mph7 km/h from NorthwestClearClear
October 2454°F12°C85°F29°C3 mph5 km/h from NorthwestClearClear
October 2555°F13°C81°F27°C3 mph5 km/h from SouthwestMostly ClearPartly Cloudy
October 2653°F12°C75°F24°C3 mph6 km/h from WestMostly ClearMostly Clear
October 2753°F12°C80°F27°C3 mph5 km/h from NorthwestClearClear

Yes

Low of 54°F12°C, High of 72°F22°C
Wind: 5 mph8 km/h
Precipitation: None

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