Yes

you do need a jacket based on the weather in Hertfordshire, UK 1 second ago

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
50°F10°C & Mostly Cloudy

Wind is 7 mph11 km/h from the East, gusting to 16 mph25 km/h
March 20
7pm49°F10°C8 mph13 km/h EastCloudy
8pm49°F9°C8 mph13 km/h SoutheastCloudy
9pm48°F9°C8 mph13 km/h EastCloudy
10pm48°F9°C8 mph13 km/h EastCloudy
11pm48°F9°C8 mph13 km/h EastCloudy
March 21
12am47°F9°C9 mph14 km/h EastCloudy
1am47°F8°C9 mph14 km/h EastCloudy
2am47°F8°C9 mph14 km/h EastCloudy
3am48°F9°C10 mph16 km/h EastCloudy
4am50°F10°C10 mph16 km/h EastCloudy
5am53°F12°C11 mph17 km/h EastCloudy
6am56°F13°C13 mph20 km/h EastCloudy
DateLowHighWindDayNight
March 1942°F6°C66°F19°C3 mph5 km/h from SoutheastMostly ClearMostly Cloudy
March 2047°F8°C60°F16°C12 mph20 km/h from SoutheastCloudyRain
March 2147°F8°C56°F13°C7 mph12 km/h from SouthDrizzleDrizzle
March 2245°F7°C56°F13°C6 mph10 km/h from NorthRainMostly Cloudy
March 2343°F6°C55°F13°C8 mph14 km/h from NorthMostly CloudyMostly Cloudy
March 2441°F5°C54°F12°C6 mph9 km/h from NorthwestMostly CloudyMostly Cloudy
March 2541°F5°C54°F12°C5 mph8 km/h from NorthPartly CloudyPartly Cloudy

Yes

Low of 47°F9°C, High of 60°F16°C
Wind: 12 mph20 km/h
Precipitation: 22% rain

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