Yes

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

Why? Because it's pretty chilly!
58°F14°C & Cloudy

Wind is 2 mph4 km/h from the Southwest, gusting to 3 mph5 km/h
June 5
2am57°F14°C2 mph4 km/h SouthwestCloudy
3am57°F14°C2 mph3 km/h WestCloudy
4am57°F14°C2 mph3 km/h NorthwestCloudy
5am57°F14°C2 mph3 km/h NorthwestHaze
6am56°F14°C2 mph3 km/h NorthwestHaze
7am56°F14°C2 mph3 km/h NorthHaze
8am56°F13°C2 mph3 km/h NorthCloudy
9am57°F14°C1 mph2 km/h NorthwestMostly Cloudy
10am58°F15°C1 mph2 km/h NorthwestMostly Cloudy
11am60°F16°C2 mph4 km/h WestMostly Cloudy
12pm63°F17°C3 mph5 km/h WestMostly Cloudy
1pm66°F19°C4 mph7 km/h WestPartly Cloudy
DateLowHighWindDayNight
June 456°F13°C66°F19°C3 mph5 km/h from WestMostly CloudyCloudy
June 556°F13°C75°F24°C6 mph9 km/h from WestMostly ClearMostly Cloudy
June 658°F14°C75°F24°C6 mph9 km/h from WestMostly ClearPartly Cloudy
June 758°F15°C77°F25°C6 mph9 km/h from WestMostly ClearMostly Clear
June 858°F15°C79°F26°C5 mph9 km/h from WestClearMostly Clear
June 959°F15°C81°F27°C5 mph8 km/h from SouthwestClearMostly Clear
June 1061°F16°C80°F27°C6 mph9 km/h from SouthwestClearMostly Clear

Yes

Low of 56°F14°C, High of 74°F24°C
Wind: 6 mph9 km/h
Precipitation: None

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