Yes

you do need a jacket based on the weather in St. Petersburg, FL, USA 16 seconds ago

Why? Because the wind is harsh and biting!
74°F23°C & Mostly Cloudy

Wind is 13 mph21 km/h from the Northwest, gusting to 24 mph38 km/h
October 30
5pm74°F24°C14 mph23 km/h NorthwestPartly Cloudy
6pm75°F24°C15 mph24 km/h NorthwestMostly Clear
7pm73°F23°C14 mph22 km/h NorthwestMostly Cloudy
8pm74°F23°C15 mph25 km/h NorthwestWindy
9pm73°F23°C16 mph25 km/h NorthwestWindy
10pm71°F21°C14 mph22 km/h NorthwestMostly Cloudy
11pm69°F21°C12 mph19 km/h NorthwestPartly Cloudy
October 31
12am68°F20°C13 mph20 km/h NorthwestPartly Cloudy
1am67°F20°C12 mph19 km/h NorthwestPartly Cloudy
2am67°F19°C12 mph19 km/h NorthwestMostly Clear
3am66°F19°C11 mph18 km/h NorthwestPartly Cloudy
4am66°F19°C11 mph17 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
October 3061°F16°C75°F24°C11 mph18 km/h from NorthwestPartly CloudyPartly Cloudy
October 3159°F15°C70°F21°C9 mph15 km/h from NorthPartly CloudyMostly Clear
November 159°F15°C72°F22°C6 mph9 km/h from NortheastClearMostly Clear
November 260°F16°C75°F24°C8 mph13 km/h from NorthMostly ClearPartly Cloudy
November 361°F16°C71°F22°C11 mph17 km/h from NorthDrizzlePartly Cloudy
November 461°F16°C76°F25°C11 mph18 km/h from NortheastMostly ClearMostly Clear
November 562°F17°C79°F26°C11 mph17 km/h from NortheastMostly ClearClear

No

Low of 59°F15°C, High of 70°F21°C
Wind: 9 mph15 km/h
Precipitation: None

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