Yes

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

Why? Because it's so windy, you’re practically horizontal just trying to walk!
75°F24°C & Cloudy

Wind is 12 mph20 km/h from the South, gusting to 29 mph47 km/h
September 7
12pm73°F23°C13 mph20 km/h SouthwestCloudy
1pm72°F22°C12 mph19 km/h SouthwestCloudy
2pm70°F21°C11 mph18 km/h SouthwestMostly Cloudy
3pm68°F20°C10 mph16 km/h SouthwestPartly Cloudy
4pm66°F19°C9 mph14 km/h SouthwestMostly Clear
5pm64°F18°C8 mph13 km/h SouthwestPartly Cloudy
6pm63°F17°C7 mph12 km/h SouthwestMostly Cloudy
7pm61°F16°C7 mph11 km/h SouthwestMostly Cloudy
8pm60°F16°C6 mph10 km/h SouthwestMostly Cloudy
9pm60°F15°C5 mph8 km/h SouthwestMostly Clear
10pm59°F15°C5 mph8 km/h SouthwestMostly Clear
11pm58°F14°C5 mph8 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 660°F15°C77°F25°C10 mph15 km/h from SouthMostly CloudyPartly Cloudy
September 756°F13°C69°F20°C8 mph12 km/h from SouthwestMostly ClearPartly Cloudy
September 851°F10°C69°F20°C6 mph9 km/h from SouthPartly CloudyPartly Cloudy
September 955°F13°C67°F19°C10 mph17 km/h from SouthPartly CloudyRain
September 1053°F12°C64°F18°C12 mph19 km/h from SouthwestDrizzleDrizzle
September 1149°F10°C63°F17°C11 mph18 km/h from SouthwestDrizzleDrizzle
September 1250°F10°C62°F17°C10 mph17 km/h from SouthwestDrizzleRain

Yes

Low of 56°F14°C, High of 69°F21°C
Wind: 8 mph12 km/h
Precipitation: None

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