Yes

you do need a jacket based on the weather in Belmont Rd, Hemel Hempstead HP3 9NX, UK 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's so windy, even the squirrels are holding onto branches for dear life!
58°F14°C & Partly Cloudy

Wind is 12 mph19 km/h from the West, gusting to 22 mph35 km/h
September 10
6pm58°F14°C12 mph19 km/h WestMostly Clear
7pm56°F13°C11 mph18 km/h WestMostly Clear
8pm55°F13°C11 mph17 km/h WestClear
9pm54°F12°C10 mph16 km/h SouthwestClear
10pm53°F12°C10 mph15 km/h SouthwestMostly Clear
11pm53°F11°C10 mph16 km/h SouthwestMostly Clear
September 11
12am52°F11°C10 mph17 km/h SouthwestMostly Cloudy
1am52°F11°C11 mph17 km/h SouthwestMostly Cloudy
2am52°F11°C11 mph17 km/h SouthwestPartly Cloudy
3am53°F12°C12 mph19 km/h SouthwestMostly Clear
4am55°F13°C13 mph21 km/h SouthwestPartly Cloudy
5am58°F14°C14 mph23 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 956°F13°C64°F18°C7 mph12 km/h from SouthDrizzleDrizzle
September 1052°F11°C62°F17°C14 mph23 km/h from SouthwestDrizzleDrizzle
September 1150°F10°C63°F17°C13 mph21 km/h from SouthwestDrizzleRain
September 1251°F11°C63°F17°C12 mph19 km/h from SouthwestDrizzlePartly Cloudy
September 1350°F10°C65°F19°C15 mph24 km/h from SouthThunderstormsThunderstorms
September 1454°F12°C62°F17°C22 mph35 km/h from SouthwestDrizzleWindy
September 1551°F11°C62°F17°C15 mph25 km/h from WestWindyMostly Cloudy

Yes

Low of 52°F11°C, High of 63°F17°C
Wind: 14 mph23 km/h
Precipitation: 62% rain

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