Yes

you do need a jacket based on the weather in 27 High W St, Dorchester DT1 1UP, UK 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
43°F6°C & Mostly Cloudy

Wind is 1 mph2 km/h from the Northwest, gusting to 2 mph3 km/h
April 27
10pm43°F6°C2 mph3 km/h NorthwestMostly Cloudy
11pm43°F6°C2 mph3 km/h NorthwestPartly Cloudy
April 28
12am43°F6°C2 mph3 km/h NorthPartly Cloudy
1am43°F6°C2 mph3 km/h NorthMostly Cloudy
2am46°F8°C2 mph3 km/h NortheastMostly Cloudy
3am50°F10°C2 mph3 km/h EastMostly Cloudy
4am54°F12°C3 mph4 km/h EastMostly Cloudy
5am58°F14°C4 mph7 km/h SoutheastMostly Cloudy
6am61°F16°C6 mph9 km/h SoutheastMostly Cloudy
7am63°F17°C7 mph11 km/h SoutheastMostly Cloudy
8am63°F17°C8 mph13 km/h SoutheastMostly Cloudy
9am64°F18°C8 mph14 km/h SoutheastPartly Cloudy
DateLowHighWindDayNight
April 2743°F6°C65°F18°C6 mph10 km/h from SoutheastPartly CloudyMostly Clear
April 2847°F8°C69°F21°C10 mph17 km/h from EastClearClear
April 2950°F10°C72°F22°C9 mph14 km/h from EastClearMostly Clear
April 3054°F12°C72°F22°C7 mph11 km/h from SoutheastMostly ClearMostly Clear
May 151°F11°C71°F22°C6 mph10 km/h from NortheastPartly CloudyPartly Cloudy
May 253°F12°C69°F21°C10 mph16 km/h from EastPartly CloudyDrizzle
May 351°F10°C64°F18°C13 mph20 km/h from NortheastDrizzleDrizzle

Yes

Low of 47°F9°C, High of 70°F21°C
Wind: 10 mph17 km/h
Precipitation: None

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