Yes

you do need a jacket based on the weather in Tring HP23, UK 1 second ago

Why? Because the air feels like the cozy middle ground between summer and winter and it's really really huffing out there!
55°F13°C & Windy

Wind is 17 mph28 km/h from the West, gusting to 32 mph52 km/h
September 15
7pm55°F13°C17 mph27 km/h WestWindy
8pm54°F12°C17 mph27 km/h WestWindy
9pm53°F12°C16 mph26 km/h WestWindy
10pm53°F12°C16 mph25 km/h WestWindy
11pm52°F11°C15 mph25 km/h WestWindy
September 16
12am52°F11°C15 mph25 km/h WestWindy
1am51°F11°C15 mph25 km/h WestWindy
2am52°F11°C15 mph24 km/h WestPartly Cloudy
3am53°F11°C15 mph24 km/h WestMostly Clear
4am55°F13°C15 mph24 km/h WestWindy
5am57°F14°C17 mph27 km/h WestWindy
6am59°F15°C17 mph27 km/h WestWindy
DateLowHighWindDayNight
September 1455°F13°C64°F18°C15 mph25 km/h from SouthwestWindyMostly Clear
September 1551°F11°C63°F17°C15 mph24 km/h from WestMostly CloudyDrizzle
September 1653°F12°C67°F20°C16 mph26 km/h from SouthwestDrizzleCloudy
September 1760°F15°C71°F22°C16 mph26 km/h from SouthwestWindyCloudy
September 1859°F15°C73°F23°C9 mph15 km/h from SouthMostly CloudyMostly Cloudy
September 1956°F14°C70°F21°C10 mph16 km/h from SouthwestDrizzleDrizzle
September 2048°F9°C62°F17°C7 mph12 km/h from WestDrizzleDrizzle

Yes

Low of 52°F11°C, High of 64°F18°C
Wind: 15 mph24 km/h
Precipitation: None

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