Yes

you do need a jacket based on the weather in Basingstoke, UK 12 minutes ago

Why? Because it's cool. Pleasantly cool, but cool!
55°F13°C & Cloudy

Wind is 6 mph9 km/h from the South, gusting to 11 mph18 km/h
September 14
5am56°F14°C7 mph11 km/h SouthCloudy
6am58°F14°C9 mph15 km/h SouthCloudy
7am59°F15°C11 mph17 km/h SouthCloudy
8am61°F16°C12 mph20 km/h SouthCloudy
9am61°F16°C15 mph24 km/h SouthDrizzle
10am61°F16°C15 mph25 km/h SouthDrizzle
11am62°F17°C17 mph28 km/h SouthRain
12pm64°F18°C19 mph30 km/h SouthDrizzle
1pm65°F18°C19 mph31 km/h SouthwestRain
2pm64°F18°C21 mph34 km/h SouthwestRain
3pm64°F18°C21 mph34 km/h SouthwestDrizzle
4pm63°F17°C21 mph34 km/h SouthwestWindy
DateLowHighWindDayNight
September 1345°F7°C65°F18°C12 mph19 km/h from SouthRainRain
September 1455°F13°C63°F17°C23 mph37 km/h from SouthwestDrizzleWindy
September 1551°F11°C63°F17°C14 mph23 km/h from WestMostly CloudyRain
September 1654°F12°C69°F20°C19 mph30 km/h from SouthwestDrizzleDrizzle
September 1759°F15°C68°F20°C13 mph21 km/h from SouthwestMostly CloudyMostly Cloudy
September 1857°F14°C69°F21°C10 mph17 km/h from SouthMostly CloudyMostly Cloudy
September 1957°F14°C68°F20°C15 mph24 km/h from SouthwestDrizzleDrizzle

Yes

Low of 55°F13°C, High of 63°F17°C
Wind: 23 mph37 km/h
Precipitation: 33% rain

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