Yes

you do need a jacket based on the weather in Biloxi, MS, USA 1 second ago

Why? Because it's so windy, your hat is now someone else's problem, two cities away!
80°F26°C & Windy

Wind is 15 mph24 km/h from the Southwest, gusting to 27 mph44 km/h
May 21
2am79°F26°C14 mph23 km/h SouthwestPartly Cloudy
3am79°F26°C13 mph20 km/h SouthwestMostly Cloudy
4am79°F26°C10 mph16 km/h WestMostly Cloudy
5am78°F26°C9 mph14 km/h WestMostly Cloudy
6am77°F25°C8 mph13 km/h WestMostly Cloudy
7am76°F25°C8 mph13 km/h WestMostly Cloudy
8am76°F24°C7 mph11 km/h WestMostly Cloudy
9am76°F25°C7 mph11 km/h NorthwestThunderstorms
10am77°F25°C6 mph10 km/h NorthThunderstorms
11am78°F26°C6 mph10 km/h NorthThunderstorms
12pm80°F26°C6 mph10 km/h NorthMostly Cloudy
1pm82°F28°C5 mph7 km/h NorthMostly Cloudy
DateLowHighWindDayNight
May 2174°F24°C83°F28°C5 mph8 km/h from NorthwestRainMostly Cloudy
May 2271°F22°C85°F29°C7 mph11 km/h from SoutheastMostly ClearMostly Clear
May 2372°F22°C87°F30°C6 mph10 km/h from SouthClearMostly Clear
May 2475°F24°C86°F30°C10 mph16 km/h from SoutheastMostly ClearMostly Clear
May 2578°F25°C87°F30°C11 mph17 km/h from SouthMostly ClearMostly Clear
May 2677°F25°C87°F31°C12 mph19 km/h from SouthDrizzleDrizzle
May 2771°F22°C84°F29°C8 mph13 km/h from SouthwestRainMostly Cloudy

No

Low of 71°F22°C, High of 85°F30°C
Wind: 7 mph11 km/h
Precipitation: None

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