Yes

you do need a jacket based on the weather in Brighton and Hove (Brighton), England, United Kingdom 1 second ago

Why? Because it's so windy, even the squirrels are holding onto branches for dear life!
66°F19°C & Mostly Cloudy

Wind is 14 mph23 km/h from the Southeast, gusting to 25 mph40 km/h
June 12
7am66°F19°C13 mph20 km/h SoutheastRain
8am68°F20°C11 mph18 km/h SoutheastMostly Cloudy
9am69°F21°C11 mph18 km/h SoutheastMostly Clear
10am70°F21°C10 mph15 km/h SouthMostly Clear
11am69°F21°C10 mph16 km/h SouthMostly Clear
12pm67°F20°C11 mph18 km/h SouthwestPartly Cloudy
1pm67°F20°C9 mph15 km/h SouthwestMostly Clear
2pm66°F19°C7 mph11 km/h SouthwestMostly Clear
3pm65°F18°C6 mph9 km/h SouthwestMostly Clear
4pm63°F17°C3 mph5 km/h SouthwestMostly Clear
5pm61°F16°C2 mph4 km/h SouthwestMostly Clear
6pm60°F16°C3 mph4 km/h SouthMostly Clear
DateLowHighWindDayNight
June 1159°F15°C70°F21°C11 mph18 km/h from SoutheastRainMostly Clear
June 1257°F14°C74°F23°C4 mph6 km/h from SouthwestPartly CloudyHeavy Rain
June 1357°F14°C66°F19°C12 mph20 km/h from SouthwestMostly CloudyPartly Cloudy
June 1455°F13°C66°F19°C15 mph24 km/h from SouthwestPartly CloudyClear
June 1555°F13°C69°F21°C8 mph12 km/h from SouthwestMostly ClearMostly Clear
June 1656°F13°C73°F23°C6 mph10 km/h from SouthwestMostly ClearMostly Clear
June 1759°F15°C75°F24°C5 mph9 km/h from WestMostly ClearMostly Clear

Yes

Low of 57°F14°C, High of 74°F24°C
Wind: 4 mph6 km/h
Precipitation: 19% rain

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