Yes

you do need a jacket based on the weather in San Antonio, TX, USA 2 minutes ago

Why? Because too cold for just a hoodie, too warm for a parka and it's so windy, your hat has officially retired from your head!
40°F4°C & Clear

Wind is 14 mph23 km/h from the North, gusting to 23 mph37 km/h
January 19
1pm42°F6°C14 mph22 km/h NorthClear
2pm44°F7°C12 mph20 km/h NorthClear
3pm46°F8°C11 mph18 km/h NorthClear
4pm46°F8°C11 mph18 km/h NorthClear
5pm46°F8°C10 mph16 km/h NortheastClear
6pm45°F7°C9 mph15 km/h NortheastClear
7pm42°F6°C8 mph12 km/h NortheastClear
8pm40°F4°C6 mph10 km/h NortheastClear
9pm37°F3°C7 mph11 km/h NortheastClear
10pm35°F2°C7 mph12 km/h EastClear
11pm33°F1°C8 mph12 km/h NortheastClear
January 20
12am31°F-0°C8 mph12 km/h NortheastClear
DateLowHighWindDayNight
January 1930°F-1°C46°F8°C12 mph19 km/h from NorthClearClear
January 2025°F-4°C40°F4°C11 mph18 km/h from NortheastMostly CloudySnow
January 2125°F-4°C38°F3°C11 mph17 km/h from NorthMostly CloudyClear
January 2223°F-5°C48°F9°C6 mph10 km/h from SouthwestMostly ClearPartly Cloudy
January 2332°F-0°C61°F16°C5 mph9 km/h from NortheastClearClear
January 2435°F2°C67°F19°C7 mph11 km/h from SouthClearPartly Cloudy
January 2544°F7°C74°F23°C8 mph13 km/h from SouthMostly CloudyPartly Cloudy

Yes

Low of 25°F-4°C, High of 39°F4°C
Wind: 11 mph18 km/h
Precipitation: None

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