Yes

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

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
47°F8°C & Mostly Cloudy

Wind is 2 mph3 km/h from the South, gusting to 6 mph10 km/h
December 26
7am47°F8°C2 mph4 km/h SouthMostly Cloudy
8am48°F9°C3 mph4 km/h SouthMostly Cloudy
9am48°F9°C3 mph4 km/h SouthwestMostly Cloudy
10am48°F9°C2 mph4 km/h SouthwestMostly Cloudy
11am47°F9°C2 mph3 km/h SouthwestMostly Cloudy
12pm47°F8°C2 mph3 km/h SouthwestMostly Cloudy
1pm46°F8°C2 mph3 km/h SouthMostly Cloudy
2pm46°F8°C2 mph3 km/h SouthMostly Cloudy
3pm45°F7°C2 mph3 km/h SouthMostly Cloudy
4pm44°F7°C2 mph3 km/h SouthwestMostly Cloudy
5pm44°F7°C2 mph3 km/h SouthwestMostly Cloudy
6pm44°F7°C2 mph3 km/h SouthMostly Cloudy
DateLowHighWindDayNight
December 2543°F6°C48°F9°C2 mph3 km/h from SouthMostly CloudyMostly Cloudy
December 2642°F6°C47°F8°C1 mph2 km/h from NorthwestMostly CloudyMostly Cloudy
December 2740°F5°C46°F8°C3 mph5 km/h from SouthwestMostly CloudyPartly Cloudy
December 2839°F4°C49°F10°C7 mph11 km/h from SouthwestMostly CloudyMostly Cloudy
December 2941°F5°C49°F10°C9 mph15 km/h from SouthwestMostly CloudyCloudy
December 3045°F7°C52°F11°C16 mph25 km/h from SouthwestDrizzleRain
December 3134°F1°C46°F8°C7 mph12 km/h from NorthRainRain

Yes

Low of 42°F6°C, High of 47°F9°C
Wind: 1 mph2 km/h
Precipitation: None

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