Yes

you do need a jacket based on the weather in Saltdean, Brighton BN2, UK 1 second ago

Why? Because it's really really huffing out there!
66°F19°C & Windy

Wind is 25 mph40 km/h from the Southwest, gusting to 37 mph59 km/h
September 17
9am66°F19°C26 mph41 km/h SouthwestWindy
10am66°F19°C26 mph42 km/h SouthwestWindy
11am66°F19°C26 mph42 km/h SouthwestWindy
12pm66°F19°C24 mph39 km/h SouthwestWindy
1pm66°F19°C23 mph37 km/h SouthwestWindy
2pm65°F19°C22 mph36 km/h SouthwestWindy
3pm65°F18°C21 mph34 km/h SouthwestWindy
4pm65°F18°C21 mph34 km/h SouthwestWindy
5pm65°F18°C21 mph34 km/h SouthwestWindy
6pm64°F18°C20 mph33 km/h SouthwestWindy
7pm64°F18°C20 mph32 km/h SouthwestWindy
8pm64°F18°C20 mph32 km/h SouthwestWindy
DateLowHighWindDayNight
September 1659°F15°C66°F19°C19 mph31 km/h from SouthwestDrizzleWindy
September 1763°F17°C68°F20°C18 mph29 km/h from SouthwestWindyMostly Cloudy
September 1860°F16°C69°F21°C10 mph16 km/h from SouthMostly ClearPartly Cloudy
September 1959°F15°C69°F21°C13 mph21 km/h from SouthwestDrizzleDrizzle
September 2050°F10°C60°F16°C17 mph27 km/h from NorthwestDrizzleDrizzle
September 2147°F9°C62°F16°C18 mph29 km/h from NorthWindyPartly Cloudy
September 2248°F9°C60°F16°C16 mph25 km/h from NortheastRainDrizzle

No

Low of 63°F17°C, High of 68°F20°C
Wind: 18 mph29 km/h
Precipitation: None

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