Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it and the wind makes walking forward feel like moonwalking in reverse!
53°F11°C & Windy

Wind is 16 mph25 km/h from the Northwest, gusting to 30 mph49 km/h
October 23
3pm53°F11°C15 mph23 km/h NorthwestMostly Cloudy
4pm50°F10°C16 mph27 km/h WestDrizzle
5pm48°F9°C19 mph30 km/h NorthwestDrizzle
6pm47°F8°C19 mph31 km/h NorthwestWindy
7pm46°F8°C18 mph29 km/h WestWindy
8pm45°F7°C17 mph27 km/h WestWindy
9pm45°F7°C16 mph26 km/h WestWindy
10pm44°F7°C16 mph25 km/h WestWindy
11pm44°F7°C16 mph25 km/h WestWindy
October 24
12am44°F7°C15 mph24 km/h WestWindy
1am44°F6°C15 mph24 km/h WestWindy
2am43°F6°C14 mph23 km/h WestClear
DateLowHighWindDayNight
October 2244°F7°C53°F12°C18 mph28 km/h from NorthwestRainWindy
October 2342°F6°C53°F11°C15 mph24 km/h from SouthwestDrizzleDrizzle
October 2441°F5°C50°F10°C13 mph22 km/h from NorthwestPartly CloudyMostly Clear
October 2539°F4°C49°F10°C14 mph22 km/h from WestPartly CloudyDrizzle
October 2743°F6°C53°F12°C15 mph24 km/h from NorthwestWindyPartly Cloudy
October 2841°F5°C54°F12°C9 mph15 km/h from SouthwestMostly CloudyPartly Cloudy
October 2944°F7°C56°F13°C8 mph13 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 42°F6°C, High of 53°F12°C
Wind: 15 mph24 km/h
Precipitation: 33% rain

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