Yes

you do need a jacket based on the weather in Hampstead Garden Suburb, London NW11, UK 1 second ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
40°F4°C & Cloudy

Wind is 2 mph3 km/h from the Southwest, gusting to 4 mph6 km/h
January 20
12pm39°F4°C2 mph3 km/h SouthwestCloudy
1pm38°F4°C2 mph4 km/h SouthwestMostly Cloudy
2pm38°F4°C2 mph4 km/h SouthwestMostly Cloudy
3pm38°F4°C3 mph5 km/h SouthwestMostly Cloudy
4pm38°F3°C3 mph5 km/h SouthwestPartly Cloudy
5pm38°F3°C3 mph5 km/h SouthwestPartly Cloudy
6pm37°F3°C4 mph6 km/h SouthwestPartly Cloudy
7pm37°F3°C4 mph6 km/h SouthwestPartly Cloudy
8pm36°F2°C4 mph6 km/h SouthwestMostly Cloudy
9pm36°F2°C4 mph6 km/h SouthwestMostly Cloudy
10pm35°F2°C3 mph5 km/h SouthwestMostly Cloudy
11pm35°F2°C3 mph5 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
January 1936°F2°C42°F6°C2 mph3 km/h from SouthwestCloudyMostly Cloudy
January 2034°F1°C41°F5°C3 mph5 km/h from SoutheastCloudyCloudy
January 2136°F2°C40°F5°C3 mph5 km/h from NorthwestCloudyMostly Cloudy
January 2235°F1°C47°F8°C11 mph18 km/h from SouthwestDrizzleRain
January 2342°F5°C52°F11°C17 mph27 km/h from SouthwestRainDrizzle
January 2442°F5°C46°F8°C7 mph11 km/h from SouthwestDrizzleMostly Cloudy
January 2541°F5°C47°F8°C12 mph20 km/h from SouthMostly CloudyDrizzle

Yes

Low of 34°F1°C, High of 42°F6°C
Wind: 3 mph5 km/h
Precipitation: None

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