Yes

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

Why? Because it's cool. Pleasantly cool, but cool.
55°F13°C & Mostly Cloudy

Wind is 7 mph12 km/h from the NE, gusting to 16 mph25 km/h
March 19
2am55°F13°C8 mph12 km/h NEMostly Cloudy
3am53°F12°C5 mph9 km/h NEMostly Cloudy
4am53°F12°C4 mph7 km/h NEMostly Cloudy
5am52°F11°C4 mph7 km/h NEMostly Cloudy
6am51°F11°C5 mph8 km/h NEMostly Cloudy
7am51°F10°C6 mph9 km/h NEMostly Cloudy
8am50°F10°C6 mph10 km/h NEMostly Cloudy
9am49°F10°C6 mph9 km/h NEMostly Cloudy
10am51°F10°C7 mph10 km/h EMostly Cloudy
11am53°F11°C6 mph10 km/h EMostly Cloudy
12pm56°F13°C6 mph10 km/h EMostly Cloudy
1pm58°F14°C6 mph10 km/h EMostly Cloudy
DateLowHighWindDayNight
March 1949°F10°C62°F17°C6 mph9 km/h from SEMostly CloudyMostly Cloudy
March 2053°F12°C67°F20°C6 mph10 km/h from SECloudyCloudy
March 2159°F15°C78°F26°C6 mph9 km/h from SWDrizzleMostly Clear
March 2258°F15°C83°F28°C5 mph7 km/h from SEMostly ClearMostly Clear
March 2358°F15°C79°F26°C8 mph13 km/h from SEPartly CloudyMostly Cloudy
March 2460°F16°C75°F24°C14 mph23 km/h from SCloudyCloudy
March 2565°F18°C81°F27°C8 mph13 km/h from SMostly CloudyMostly Clear

Yes

Low of 54°F12°C, High of 67°F20°C
Wind: 6 mph10 km/h
Precipitation: None

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