Yes

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

Why? Because a jacket will keep you cozy, but you won't break a seat!
52°F11°C & Clear

Wind is 2 mph3 km/h from the Northwest, gusting to 4 mph6 km/h
July 3
11pm52°F11°C2 mph4 km/h NorthwestClear
July 4
12am53°F11°C2 mph3 km/h NorthwestClear
1am55°F13°C1 mph2 km/h SouthwestClear
2am59°F15°C2 mph4 km/h SouthwestClear
3am63°F17°C4 mph6 km/h SouthwestClear
4am66°F19°C5 mph8 km/h SouthwestMostly Clear
5am70°F21°C6 mph10 km/h SouthwestMostly Clear
6am72°F22°C8 mph13 km/h SouthwestMostly Clear
7am74°F23°C9 mph14 km/h SouthwestPartly Cloudy
8am75°F24°C9 mph15 km/h WestMostly Cloudy
9am76°F24°C9 mph15 km/h WestMostly Cloudy
10am76°F25°C10 mph16 km/h WestMostly Cloudy
DateLowHighWindDayNight
July 352°F11°C76°F25°C7 mph12 km/h from SouthwestPartly CloudyPartly Cloudy
July 459°F15°C72°F22°C11 mph18 km/h from SouthwestCloudyDrizzle
July 558°F15°C69°F20°C12 mph19 km/h from SouthwestRainRain
July 655°F13°C66°F19°C10 mph17 km/h from WestRainRain
July 754°F12°C68°F20°C13 mph21 km/h from NorthwestDrizzlePartly Cloudy
July 852°F11°C74°F23°C8 mph12 km/h from NorthwestPartly CloudyMostly Clear
July 955°F13°C77°F25°C5 mph8 km/h from WestPartly CloudyPartly Cloudy

No

Low of 59°F15°C, High of 72°F22°C
Wind: 11 mph18 km/h
Precipitation: None

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