Yes

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

Why? Because it's so windy, you’re practically horizontal just trying to walk!
70°F21°C & Windy

Wind is 15 mph24 km/h from the Southeast, gusting to 25 mph41 km/h
September 6
10am70°F21°C16 mph25 km/h SoutheastWindy
11am71°F21°C15 mph25 km/h SoutheastWindy
12pm70°F21°C15 mph24 km/h SoutheastWindy
1pm69°F20°C14 mph22 km/h SoutheastMostly Cloudy
2pm67°F19°C13 mph21 km/h SoutheastMostly Cloudy
3pm65°F18°C12 mph20 km/h SoutheastMostly Cloudy
4pm64°F18°C12 mph20 km/h SoutheastMostly Cloudy
5pm63°F17°C12 mph20 km/h SoutheastMostly Cloudy
6pm63°F17°C12 mph19 km/h SoutheastMostly Cloudy
7pm62°F17°C12 mph19 km/h SoutheastMostly Cloudy
8pm62°F17°C12 mph19 km/h SoutheastMostly Cloudy
9pm61°F16°C11 mph18 km/h SoutheastMostly Cloudy
DateLowHighWindDayNight
September 552°F11°C71°F21°C11 mph18 km/h from SoutheastCloudyMostly Cloudy
September 659°F15°C76°F24°C14 mph23 km/h from SouthMostly CloudyPartly Cloudy
September 752°F11°C67°F19°C11 mph17 km/h from SouthwestMostly ClearMostly Clear
September 848°F9°C67°F19°C8 mph13 km/h from SouthPartly CloudyPartly Cloudy
September 953°F11°C66°F19°C14 mph23 km/h from SouthMostly CloudyRain
September 1053°F12°C63°F17°C14 mph23 km/h from SouthwestDrizzlePartly Cloudy
September 1150°F10°C62°F17°C15 mph24 km/h from SouthwestDrizzleMostly Clear

No

Low of 59°F15°C, High of 76°F25°C
Wind: 14 mph23 km/h
Precipitation: None

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