Yes

you do need a jacket based on the weather in Brussels, Belgium 6 seconds ago

Why? Because it's quite chilly!
35°F2°C & Clear

Wind is 4 mph6 km/h from the Southwest, gusting to 8 mph13 km/h
January 10
9am35°F2°C4 mph6 km/h SouthwestClear
10am33°F1°C3 mph6 km/h SouthwestClear
11am31°F-0°C4 mph6 km/h SouthwestMostly Clear
12pm30°F-1°C3 mph6 km/h SouthwestMostly Clear
1pm29°F-2°C4 mph6 km/h SouthwestMostly Clear
2pm28°F-2°C4 mph6 km/h SouthwestPartly Cloudy
3pm28°F-2°C4 mph7 km/h SouthwestPartly Cloudy
4pm28°F-2°C4 mph7 km/h SouthwestPartly Cloudy
5pm27°F-3°C5 mph7 km/h SouthwestPartly Cloudy
6pm27°F-3°C5 mph7 km/h SouthwestMostly Cloudy
7pm27°F-3°C5 mph8 km/h SouthwestMostly Cloudy
8pm27°F-3°C5 mph8 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
January 927°F-3°C35°F2°C4 mph7 km/h from SouthwestMostly ClearPartly Cloudy
January 1027°F-3°C34°F1°C3 mph5 km/h from SouthwestMostly CloudyMostly Cloudy
January 1129°F-1°C36°F2°C3 mph4 km/h from SouthwestMostly CloudyMostly Cloudy
January 1228°F-3°C36°F2°C5 mph9 km/h from SouthMostly CloudyMostly Cloudy
January 1330°F-1°C42°F5°C8 mph14 km/h from SouthwestMostly CloudyCloudy
January 1441°F5°C47°F8°C7 mph11 km/h from SouthwestCloudyCloudy
January 1542°F6°C46°F8°C9 mph14 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 28°F-3°C, High of 34°F1°C
Wind: 3 mph5 km/h
Precipitation: None

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