Yes

you do need a jacket based on the weather in Northgate St, Bury Saint Edmunds IP33 1HP, UK 1 second ago

Why? Because it's not very warm out!
56°F14°C & Mostly Cloudy

Wind is 8 mph13 km/h from the Northeast, gusting to 14 mph23 km/h
September 26
6am58°F14°C10 mph16 km/h EastMostly Cloudy
7am59°F15°C10 mph16 km/h EastMostly Cloudy
8am60°F16°C10 mph16 km/h EastMostly Cloudy
9am61°F16°C10 mph16 km/h EastMostly Cloudy
10am61°F16°C10 mph15 km/h EastCloudy
11am61°F16°C9 mph15 km/h EastMostly Cloudy
12pm60°F16°C8 mph13 km/h SoutheastPartly Cloudy
1pm59°F15°C7 mph12 km/h SoutheastMostly Cloudy
2pm56°F13°C6 mph10 km/h SoutheastMostly Cloudy
3pm54°F12°C4 mph7 km/h SoutheastPartly Cloudy
4pm53°F11°C3 mph6 km/h SoutheastMostly Clear
5pm51°F11°C3 mph5 km/h SoutheastMostly Clear
DateLowHighWindDayNight
September 2546°F8°C61°F16°C8 mph13 km/h from EastMostly CloudyMostly Clear
September 2645°F7°C64°F18°C8 mph13 km/h from SouthMostly CloudyPartly Cloudy
September 2750°F10°C64°F18°C6 mph10 km/h from SouthMostly CloudyPartly Cloudy
September 2844°F7°C65°F18°C4 mph6 km/h from NorthwestMostly CloudyMostly Cloudy
September 2945°F7°C66°F19°C3 mph5 km/h from SouthwestPartly CloudyPartly Cloudy
September 3046°F8°C66°F19°C6 mph9 km/h from SoutheastMostly CloudyMostly Cloudy
October 148°F9°C64°F18°C8 mph13 km/h from SouthMostly CloudyMostly Cloudy

Yes

Low of 45°F7°C, High of 64°F18°C
Wind: 8 mph13 km/h
Precipitation: None

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