Yes

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

Why? Because it's on the windy side!
62°F17°C & Cloudy

Wind is 11 mph18 km/h from the South, gusting to 21 mph34 km/h
September 27
11am62°F16°C11 mph18 km/h SouthCloudy
12pm61°F16°C11 mph17 km/h SouthMostly Cloudy
1pm60°F15°C10 mph15 km/h SouthMostly Cloudy
2pm58°F14°C8 mph13 km/h SouthPartly Cloudy
3pm56°F13°C7 mph12 km/h SouthPartly Cloudy
4pm55°F13°C7 mph11 km/h SouthPartly Cloudy
5pm54°F12°C7 mph11 km/h SoutheastPartly Cloudy
6pm54°F12°C7 mph11 km/h SouthPartly Cloudy
7pm53°F12°C6 mph10 km/h SoutheastMostly Cloudy
8pm53°F12°C6 mph10 km/h SoutheastDrizzle
9pm53°F12°C6 mph10 km/h SoutheastMostly Cloudy
10pm53°F12°C6 mph9 km/h SouthDrizzle
DateLowHighWindDayNight
September 2651°F11°C62°F17°C8 mph13 km/h from SouthMostly CloudyMostly Cloudy
September 2750°F10°C64°F18°C5 mph8 km/h from NorthwestDrizzleClear
September 2843°F6°C63°F17°C3 mph5 km/h from NorthPartly CloudyMostly Cloudy
September 2946°F8°C64°F18°C3 mph5 km/h from WestPartly CloudyPartly Cloudy
September 3047°F8°C65°F18°C3 mph5 km/h from SouthMostly CloudyMostly Cloudy
October 149°F10°C66°F19°C7 mph11 km/h from SouthMostly CloudyCloudy
October 255°F13°C63°F17°C10 mph15 km/h from SouthwestRainRain

Yes

Low of 49°F10°C, High of 64°F18°C
Wind: 5 mph8 km/h
Precipitation: 30% rain

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