Yes

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

Why? Because it's cool. Pleasantly cool, but cool and it's on the windy side!
57°F14°C & Mostly Clear

Wind is 11 mph18 km/h from the Southwest, gusting to 23 mph37 km/h
September 11
6pm57°F14°C12 mph19 km/h SouthwestMostly Clear
7pm57°F14°C12 mph19 km/h SouthwestMostly Clear
8pm56°F13°C12 mph19 km/h SouthwestPartly Cloudy
9pm56°F13°C12 mph19 km/h SouthwestMostly Clear
10pm55°F13°C12 mph20 km/h SouthwestPartly Cloudy
11pm55°F13°C12 mph20 km/h SouthwestMostly Cloudy
September 12
12am54°F12°C13 mph20 km/h SouthwestMostly Cloudy
1am54°F12°C13 mph21 km/h SouthwestMostly Cloudy
2am55°F13°C13 mph21 km/h SouthwestPartly Cloudy
3am56°F13°C14 mph22 km/h SouthwestMostly Clear
4am58°F14°C16 mph25 km/h SouthwestWindy
5am60°F15°C16 mph26 km/h SouthwestWindy
DateLowHighWindDayNight
September 1056°F13°C65°F19°C11 mph18 km/h from SouthwestRainDrizzle
September 1154°F12°C65°F18°C14 mph23 km/h from SouthwestDrizzleDrizzle
September 1253°F12°C64°F18°C12 mph19 km/h from SouthwestDrizzleDrizzle
September 1352°F11°C66°F19°C10 mph17 km/h from SouthwestDrizzleRain
September 1458°F14°C67°F19°C20 mph32 km/h from SouthwestDrizzleWindy
September 1555°F13°C64°F18°C18 mph28 km/h from SouthwestDrizzleDrizzle
September 1653°F11°C64°F18°C11 mph18 km/h from SouthwestDrizzleDrizzle

Yes

Low of 55°F13°C, High of 64°F18°C
Wind: 14 mph23 km/h
Precipitation: 39% rain

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