Yes

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

Why? Because it's pretty chilly.
53°F11°C & Cloudy

Wind is 9 mph15 km/h from the W, gusting to 19 mph30 km/h
April 25
8am53°F12°C10 mph16 km/h WMostly Cloudy
9am53°F12°C9 mph14 km/h WCloudy
10am52°F11°C9 mph14 km/h WCloudy
11am51°F11°C8 mph12 km/h WDrizzle
12pm50°F10°C6 mph10 km/h WCloudy
1pm50°F10°C5 mph8 km/h NWCloudy
2pm49°F9°C4 mph7 km/h NWCloudy
3pm47°F8°C4 mph7 km/h NCloudy
4pm46°F8°C5 mph8 km/h NECloudy
5pm44°F7°C5 mph7 km/h NECloudy
6pm43°F6°C5 mph8 km/h NECloudy
7pm42°F6°C5 mph8 km/h NECloudy
DateLowHighWindDayNight
April 2435°F2°C53°F12°C7 mph11 km/h from WDrizzleCloudy
April 2538°F3°C54°F12°C5 mph7 km/h from NEMostly CloudyRain
April 2640°F4°C53°F12°C10 mph15 km/h from NERainRain
April 2744°F6°C55°F13°C11 mph18 km/h from WRainPartly Cloudy
April 2840°F4°C60°F15°C9 mph14 km/h from SPartly CloudyPartly Cloudy
April 2944°F6°C61°F16°C7 mph12 km/h from SECloudyCloudy
April 3051°F10°C66°F19°C7 mph12 km/h from NEMostly CloudyMostly Cloudy

Yes

Low of 38°F4°C, High of 54°F12°C
Wind: 5 mph7 km/h
Precipitation: None

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