Yes

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

Why? Because it's on the windy side!
77°F25°C & Mostly Clear

Wind is 10 mph16 km/h from the South, gusting to 19 mph31 km/h
August 25
3pm75°F24°C10 mph15 km/h SouthClear
4pm72°F22°C10 mph17 km/h SouthClear
5pm69°F20°C12 mph19 km/h SoutheastClear
6pm67°F19°C11 mph19 km/h SoutheastClear
7pm65°F18°C11 mph17 km/h SoutheastMostly Clear
8pm63°F17°C11 mph17 km/h SouthPartly Cloudy
9pm62°F17°C10 mph15 km/h SouthMostly Clear
10pm61°F16°C8 mph13 km/h SouthMostly Cloudy
11pm60°F16°C7 mph12 km/h SoutheastMostly Cloudy
August 26
12am60°F16°C7 mph11 km/h SoutheastMostly Cloudy
1am60°F15°C6 mph10 km/h SoutheastMostly Cloudy
2am60°F16°C6 mph10 km/h SoutheastMostly Cloudy
DateLowHighWindDayNight
August 2457°F14°C81°F27°C8 mph13 km/h from SouthMostly ClearPartly Cloudy
August 2560°F15°C75°F24°C11 mph17 km/h from SouthwestMostly CloudyPartly Cloudy
August 2657°F14°C71°F22°C13 mph21 km/h from SouthRainMostly Clear
August 2753°F12°C69°F21°C12 mph19 km/h from SouthPartly CloudyRain
August 2856°F13°C69°F20°C11 mph18 km/h from SouthwestDrizzleMostly Clear
August 2955°F13°C68°F20°C12 mph19 km/h from SouthwestMostly CloudyRain
August 3056°F14°C64°F18°C12 mph20 km/h from WestRainPartly Cloudy

No

Low of 60°F16°C, High of 75°F24°C
Wind: 11 mph17 km/h
Precipitation: 14% rain

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