Yes

you do need a jacket based on the weather in The Avenue, Pinner HA5 5BJ, UK 1 second ago

Why? Because the wind makes walking forward feel like moonwalking in reverse!
62°F17°C & Partly Cloudy

Wind is 14 mph22 km/h from the Southwest, gusting to 26 mph42 km/h
September 11
7am62°F17°C14 mph22 km/h SouthwestPartly Cloudy
8am63°F17°C15 mph24 km/h SouthwestPartly Cloudy
9am64°F18°C14 mph23 km/h SouthwestMostly Cloudy
10am62°F16°C15 mph23 km/h SouthwestRain
11am62°F17°C14 mph23 km/h SouthwestPartly Cloudy
12pm61°F16°C14 mph22 km/h SouthwestMostly Clear
1pm60°F16°C14 mph23 km/h SouthwestPartly Cloudy
2pm58°F15°C12 mph20 km/h SouthwestPartly Cloudy
3pm57°F14°C12 mph19 km/h SouthwestPartly Cloudy
4pm55°F13°C11 mph18 km/h SouthwestPartly Cloudy
5pm54°F12°C11 mph17 km/h SouthwestPartly Cloudy
6pm54°F12°C12 mph19 km/h SouthwestMostly Clear
DateLowHighWindDayNight
September 1053°F12°C64°F18°C12 mph19 km/h from SouthwestRainDrizzle
September 1151°F11°C64°F18°C12 mph20 km/h from SouthwestDrizzleDrizzle
September 1252°F11°C64°F18°C11 mph17 km/h from SouthwestDrizzleMostly Clear
September 1348°F9°C66°F19°C11 mph17 km/h from SouthRainRain
September 1455°F13°C63°F17°C20 mph33 km/h from SouthwestRainPartly Cloudy
September 1553°F12°C63°F17°C13 mph20 km/h from WestMostly CloudyDrizzle
September 1653°F12°C65°F18°C13 mph20 km/h from SouthwestDrizzleMostly Cloudy

Yes

Low of 52°F11°C, High of 64°F18°C
Wind: 12 mph20 km/h
Precipitation: 46% rain

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