Yes

you do need a jacket based on the weather in Greene Walk, Berkhamsted HP4 2LW, UK 1 second ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
46°F8°C & Clear

Wind is 4 mph6 km/h from the North, gusting to 7 mph12 km/h
September 22
6pm45°F7°C4 mph6 km/h NorthClear
7pm44°F6°C3 mph5 km/h NorthClear
8pm42°F6°C4 mph6 km/h NorthClear
9pm41°F5°C4 mph6 km/h NorthClear
10pm41°F5°C3 mph5 km/h NorthwestClear
11pm40°F5°C4 mph7 km/h NorthwestMostly Clear
September 23
12am41°F5°C5 mph8 km/h NorthMostly Clear
1am41°F5°C5 mph8 km/h NorthClear
2am41°F5°C6 mph9 km/h NorthClear
3am44°F7°C7 mph11 km/h NorthClear
4am48°F9°C8 mph13 km/h NorthClear
5am52°F11°C9 mph14 km/h NorthClear
DateLowHighWindDayNight
September 2142°F5°C60°F16°C7 mph11 km/h from NorthMostly ClearClear
September 2240°F5°C62°F16°C9 mph15 km/h from NortheastPartly CloudyMostly Clear
September 2346°F8°C63°F17°C10 mph16 km/h from NortheastPartly CloudyMostly Cloudy
September 2445°F7°C64°F18°C11 mph18 km/h from NortheastPartly CloudyMostly Clear
September 2546°F8°C62°F16°C7 mph11 km/h from EastPartly CloudyMostly Cloudy
September 2648°F9°C62°F17°C8 mph12 km/h from SouthDrizzleDrizzle
September 2748°F9°C62°F17°C6 mph10 km/h from SouthDrizzleMostly Clear

Yes

Low of 40°F5°C, High of 62°F17°C
Wind: 9 mph15 km/h
Precipitation: None

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