Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
56°F13°C & Mostly Clear

Wind is 9 mph14 km/h from the West, gusting to 14 mph23 km/h
November 8
4pm54°F12°C7 mph12 km/h WestMostly Clear
5pm52°F11°C7 mph11 km/h WestClear
6pm51°F10°C6 mph10 km/h WestClear
7pm49°F9°C5 mph8 km/h SouthwestClear
8pm47°F9°C5 mph7 km/h SouthwestClear
9pm47°F8°C5 mph7 km/h SouthwestMostly Clear
10pm46°F8°C5 mph8 km/h SouthwestPartly Cloudy
11pm45°F7°C5 mph8 km/h SouthwestMostly Clear
November 9
12am45°F7°C5 mph8 km/h SouthwestMostly Clear
1am44°F7°C5 mph7 km/h SouthwestMostly Clear
2am44°F7°C5 mph8 km/h SouthwestMostly Clear
3am44°F7°C5 mph8 km/h SouthwestMostly Clear
DateLowHighWindDayNight
November 845°F7°C56°F13°C7 mph12 km/h from WestPartly CloudyMostly Clear
November 944°F7°C56°F14°C11 mph18 km/h from SouthMostly CloudyRain
November 1046°F8°C55°F13°C10 mph15 km/h from SouthRainDrizzle
November 1145°F7°C57°F14°C16 mph25 km/h from SouthWindyDrizzle
November 1253°F11°C57°F14°C15 mph24 km/h from SouthDrizzleDrizzle
November 1353°F11°C58°F14°C7 mph12 km/h from SouthCloudyCloudy
November 1452°F11°C58°F14°C9 mph15 km/h from SoutheastRainCloudy

Yes

Low of 44°F7°C, High of 56°F14°C
Wind: 11 mph18 km/h
Precipitation: None

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