Yes

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

Why? Because there are strong winds blowing out there!
65°F18°C & Mostly Cloudy

Wind is 14 mph23 km/h from the West, gusting to 29 mph47 km/h
June 1
1pm64°F18°C13 mph21 km/h WestMostly Cloudy
2pm63°F17°C11 mph18 km/h WestMostly Cloudy
3pm62°F17°C10 mph16 km/h SouthwestMostly Cloudy
4pm60°F16°C9 mph15 km/h SouthwestMostly Cloudy
5pm59°F15°C9 mph15 km/h SouthwestMostly Clear
6pm57°F14°C9 mph14 km/h SouthwestClear
7pm56°F14°C9 mph14 km/h SouthwestMostly Clear
8pm55°F13°C9 mph14 km/h SouthwestPartly Cloudy
9pm55°F13°C9 mph14 km/h SouthwestMostly Cloudy
10pm55°F13°C8 mph14 km/h SouthwestMostly Cloudy
11pm55°F13°C8 mph13 km/h SouthwestMostly Cloudy
June 2
12am54°F12°C8 mph12 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
May 3157°F14°C68°F20°C8 mph13 km/h from WestCloudyPartly Cloudy
June 154°F12°C64°F18°C10 mph16 km/h from WestMostly ClearClear
June 250°F10°C72°F22°C13 mph21 km/h from SouthwestMostly CloudyMostly Cloudy
June 353°F12°C65°F18°C11 mph18 km/h from SouthwestMostly CloudyMostly Cloudy
June 453°F12°C66°F19°C12 mph20 km/h from SouthwestMostly CloudyRain
June 553°F12°C64°F18°C14 mph23 km/h from WestRainDrizzle
June 654°F12°C62°F16°C14 mph22 km/h from SouthwestDrizzleDrizzle

Yes

Low of 54°F12°C, High of 64°F18°C
Wind: 10 mph16 km/h
Precipitation: 16% rain

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