No

you don't need a jacket based on the weather in San Marcos, CA, USA 1 second ago

70°F21°C & Mostly Cloudy

Wind is 3 mph5 km/h from the West, gusting to 5 mph8 km/h
November 3
7pm70°F21°C4 mph6 km/h WestPartly Cloudy
8pm72°F22°C5 mph8 km/h WestPartly Cloudy
9pm73°F23°C6 mph10 km/h WestPartly Cloudy
10pm73°F23°C6 mph10 km/h WestPartly Cloudy
11pm71°F22°C6 mph10 km/h WestPartly Cloudy
November 4
12am68°F20°C5 mph8 km/h WestPartly Cloudy
1am65°F18°C4 mph6 km/h WestPartly Cloudy
2am62°F17°C2 mph3 km/h WestPartly Cloudy
3am60°F16°C1 mph2 km/h WestMostly Clear
4am59°F15°C1 mph2 km/h NortheastPartly Cloudy
5am58°F15°C1 mph2 km/h NortheastPartly Cloudy
6am58°F14°C2 mph3 km/h EastPartly Cloudy
DateLowHighWindDayNight
November 355°F13°C73°F23°C4 mph6 km/h from WestPartly CloudyPartly Cloudy
November 453°F12°C72°F22°C4 mph7 km/h from WestClearPartly Cloudy
November 554°F12°C69°F21°C5 mph7 km/h from WestPartly CloudyMostly Clear
November 651°F10°C70°F21°C5 mph8 km/h from WestMostly ClearPartly Cloudy
November 755°F13°C73°F23°C4 mph6 km/h from WestClearMostly Clear
November 855°F13°C75°F24°C4 mph6 km/h from WestClearMostly Clear
November 956°F13°C77°F25°C3 mph5 km/h from WestMostly ClearMostly Clear

Yes

Low of 54°F12°C, High of 73°F23°C
Wind: 4 mph7 km/h
Precipitation: None

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