Yes

you do need a jacket based on the weather in Groenlo, Netherlands 1 second ago

Why? Because it's on the windy side!
71°F21°C & Mostly Clear

Wind is 12 mph20 km/h from the East, gusting to 22 mph36 km/h
June 12
6am71°F22°C13 mph21 km/h EastMostly Clear
7am73°F23°C14 mph22 km/h EastMostly Clear
8am75°F24°C14 mph22 km/h EastClear
9am77°F25°C14 mph23 km/h EastClear
10am78°F25°C14 mph23 km/h EastMostly Clear
11am78°F26°C15 mph24 km/h EastMostly Clear
12pm78°F25°C13 mph21 km/h EastMostly Clear
1pm76°F24°C12 mph20 km/h EastPartly Cloudy
2pm74°F23°C11 mph18 km/h EastMostly Cloudy
3pm71°F22°C11 mph18 km/h EastMostly Cloudy
4pm69°F20°C11 mph17 km/h EastMostly Cloudy
5pm67°F19°C10 mph17 km/h EastMostly Clear
DateLowHighWindDayNight
June 1152°F11°C78°F26°C13 mph20 km/h from EastClearPartly Cloudy
June 1260°F16°C86°F30°C8 mph13 km/h from EastPartly CloudyMostly Clear
June 1365°F18°C88°F31°C8 mph12 km/h from SouthwestPartly CloudyRain
June 1458°F15°C73°F23°C10 mph15 km/h from WestMostly CloudyMostly Clear
June 1554°F12°C72°F22°C10 mph16 km/h from WestPartly CloudyMostly Clear
June 1652°F11°C75°F24°C6 mph10 km/h from WestPartly CloudyMostly Clear
June 1756°F13°C75°F24°C7 mph11 km/h from WestMostly ClearMostly Clear

No

Low of 61°F16°C, High of 86°F30°C
Wind: 8 mph13 km/h
Precipitation: None

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