Yes

you do need a jacket based on the weather in Jacksonville Beach, FL, USA 1 second ago

Why? Because it's not very warm out.
54°F12°C & Clear

Wind is 8 mph13 km/h from the NW, gusting to 14 mph23 km/h
March 29
4am54°F12°C9 mph14 km/h NWClear
5am53°F12°C10 mph16 km/h NWClear
6am52°F11°C11 mph18 km/h NClear
7am52°F11°C11 mph18 km/h NClear
8am54°F12°C12 mph19 km/h NClear
9am57°F14°C13 mph21 km/h NClear
10am60°F16°C14 mph23 km/h NEClear
11am63°F17°C14 mph23 km/h NEClear
12pm64°F18°C13 mph21 km/h NEClear
1pm65°F19°C12 mph19 km/h NEClear
2pm66°F19°C11 mph18 km/h NEClear
3pm67°F19°C10 mph17 km/h NEClear
DateLowHighWindDayNight
March 2952°F11°C67°F19°C11 mph18 km/h from NEClearClear
March 3049°F10°C74°F23°C4 mph6 km/h from SMostly ClearMostly Clear
March 3154°F12°C79°F26°C5 mph8 km/h from SMostly ClearPartly Cloudy
April 158°F14°C82°F28°C6 mph9 km/h from SMostly CloudyCloudy
April 263°F17°C82°F28°C10 mph15 km/h from SWCloudyMostly Cloudy
April 361°F16°C78°F25°C16 mph26 km/h from SWRainMostly Clear
April 451°F11°C70°F21°C10 mph16 km/h from NWMostly ClearPartly Cloudy

Yes

Low of 49°F10°C, High of 73°F23°C
Wind: 4 mph6 km/h
Precipitation: None

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