Yes

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

Why? Because it's quite chilly.
48°F9°C & Windy

Wind is 16 mph25 km/h from the NW, gusting to 30 mph49 km/h
April 24
8am49°F9°C16 mph26 km/h NWWindy
9am50°F10°C16 mph26 km/h NWWindy
10am50°F10°C17 mph27 km/h NWWindy
11am50°F10°C16 mph26 km/h NWWindy
12pm49°F10°C16 mph25 km/h NWWindy
1pm48°F9°C14 mph23 km/h NWPartly Cloudy
2pm47°F8°C12 mph20 km/h NWPartly Cloudy
3pm45°F7°C10 mph17 km/h NWPartly Cloudy
4pm44°F7°C9 mph14 km/h NWPartly Cloudy
5pm44°F6°C7 mph12 km/h NWPartly Cloudy
6pm43°F6°C7 mph11 km/h NWMostly Cloudy
7pm42°F6°C6 mph10 km/h NWMostly Cloudy
DateLowHighWindDayNight
April 2339°F4°C50°F10°C13 mph20 km/h from NWDrizzleMostly Cloudy
April 2440°F5°C50°F10°C10 mph16 km/h from WDrizzleDrizzle
April 2539°F4°C54°F12°C3 mph4 km/h from SMostly CloudyMostly Cloudy
April 2644°F7°C63°F17°C9 mph14 km/h from SEDrizzleCloudy
April 2752°F11°C63°F17°C15 mph25 km/h from SWindyMostly Cloudy
April 2848°F9°C63°F17°C9 mph14 km/h from SWMostly CloudyMostly Cloudy
April 2949°F10°C67°F20°C9 mph15 km/h from SPartly CloudyMostly Cloudy

Yes

Low of 40°F5°C, High of 50°F10°C
Wind: 10 mph16 km/h
Precipitation: 43% rain

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