Yes

you do need a jacket based on the weather in St. Augustine, FL, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
59°F15°C & Clear

Wind is 6 mph9 km/h from the N, gusting to 9 mph15 km/h
March 29
2am58°F15°C6 mph10 km/h NClear
3am57°F14°C6 mph10 km/h NWClear
4am56°F13°C7 mph11 km/h NWClear
5am55°F13°C7 mph12 km/h NWClear
6am54°F12°C8 mph12 km/h NClear
7am54°F12°C8 mph14 km/h NClear
8am55°F13°C9 mph15 km/h NClear
9am59°F15°C10 mph17 km/h NClear
10am62°F17°C12 mph19 km/h NClear
11am64°F18°C12 mph19 km/h NEMostly Clear
12pm66°F19°C12 mph20 km/h NEClear
1pm67°F19°C11 mph18 km/h NEClear
DateLowHighWindDayNight
March 2954°F12°C68°F20°C10 mph16 km/h from NEClearClear
March 3053°F12°C74°F23°C4 mph7 km/h from SEPartly CloudyMostly Clear
March 3155°F13°C78°F25°C4 mph7 km/h from SMostly ClearPartly Cloudy
April 159°F15°C79°F26°C5 mph9 km/h from SMostly CloudyCloudy
April 263°F17°C81°F27°C9 mph14 km/h from SWCloudyCloudy
April 363°F17°C77°F25°C16 mph25 km/h from SWRainPartly Cloudy
April 451°F11°C67°F20°C9 mph15 km/h from NWMostly ClearPartly Cloudy

Yes

Low of 53°F12°C, High of 73°F23°C
Wind: 4 mph7 km/h
Precipitation: None

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