Yes

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

Why? Because it's quite chilly!
44°F7°C & Mostly Clear

Wind is 2 mph4 km/h from the East, gusting to 4 mph6 km/h
November 23
10am45°F7°C3 mph4 km/h EastClear
11am50°F10°C2 mph3 km/h NortheastClear
12pm57°F14°C2 mph3 km/h NorthClear
1pm62°F17°C3 mph5 km/h NorthwestMostly Clear
2pm65°F19°C4 mph6 km/h WestPartly Cloudy
3pm68°F20°C5 mph8 km/h WestMostly Clear
4pm70°F21°C6 mph9 km/h WestMostly Clear
5pm70°F21°C6 mph10 km/h WestMostly Clear
6pm68°F20°C6 mph10 km/h WestMostly Clear
7pm65°F18°C5 mph8 km/h WestPartly Cloudy
8pm62°F17°C4 mph7 km/h WestMostly Cloudy
9pm61°F16°C2 mph4 km/h WestMostly Cloudy
DateLowHighWindDayNight
November 2342°F6°C70°F21°C4 mph6 km/h from WestMostly ClearMostly Cloudy
November 2455°F13°C69°F21°C4 mph6 km/h from NorthwestMostly CloudyCloudy
November 2552°F11°C75°F24°C4 mph6 km/h from NorthwestPartly CloudyClear
November 2650°F10°C74°F23°C4 mph7 km/h from NorthwestMostly CloudyCloudy
November 2758°F14°C67°F20°C5 mph8 km/h from WestCloudyCloudy
November 2855°F13°C71°F22°C3 mph5 km/h from WestMostly CloudyMostly Cloudy
November 2956°F13°C69°F21°C2 mph4 km/h from NorthwestMostly CloudyMostly Cloudy

Yes

Low of 55°F13°C, High of 69°F21°C
Wind: 4 mph6 km/h
Precipitation: None

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