Yes

you do need a jacket based on the weather in San Antonio, TX, USA 1 second ago

Why? Because it's pretty chilly!
57°F14°C & Partly Cloudy

Wind is 5 mph8 km/h from the Northeast, gusting to 9 mph15 km/h
December 26
2am57°F14°C5 mph8 km/h EastCloudy
3am57°F14°C5 mph8 km/h NortheastCloudy
4am58°F14°C5 mph8 km/h NortheastCloudy
5am58°F15°C5 mph8 km/h NortheastCloudy
6am59°F15°C5 mph8 km/h EastCloudy
7am59°F15°C4 mph6 km/h EastCloudy
8am59°F15°C3 mph5 km/h EastCloudy
9am60°F16°C2 mph4 km/h EastCloudy
10am61°F16°C2 mph3 km/h SouthwestRain
11am62°F17°C3 mph6 km/h WestDrizzle
12pm64°F18°C6 mph9 km/h SouthwestCloudy
1pm67°F19°C8 mph14 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
December 2655°F13°C75°F24°C6 mph10 km/h from WestRainClear
December 2748°F9°C76°F24°C5 mph7 km/h from SouthwestMostly ClearPartly Cloudy
December 2855°F13°C78°F25°C7 mph11 km/h from WestPartly CloudyClear
December 2949°F10°C75°F24°C4 mph7 km/h from SouthwestMostly ClearClear
December 3051°F11°C78°F26°C7 mph12 km/h from SouthwestMostly ClearClear
December 3149°F10°C67°F19°C11 mph17 km/h from NortheastClearClear
January 144°F7°C63°F17°C9 mph15 km/h from NortheastMostly ClearPartly Cloudy

Yes

Low of 47°F9°C, High of 75°F24°C
Wind: 5 mph7 km/h
Precipitation: None

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