Yes

you do need a jacket based on the weather in Luxembourg 1 second ago

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and it's cool. Pleasantly cool, but cool!
57°F14°C & Drizzle

Wind is 7 mph11 km/h from the Southwest, gusting to 16 mph26 km/h
June 7
4pm57°F14°C7 mph12 km/h SouthwestDrizzle
5pm56°F13°C8 mph12 km/h SouthwestDrizzle
6pm56°F13°C9 mph14 km/h SouthwestRain
7pm55°F13°C10 mph17 km/h SouthwestRain
8pm54°F12°C12 mph19 km/h SouthwestDrizzle
9pm54°F12°C12 mph19 km/h SouthwestDrizzle
10pm54°F12°C13 mph20 km/h SouthwestDrizzle
11pm53°F12°C13 mph21 km/h SouthwestRain
June 8
12am53°F12°C12 mph20 km/h WestRain
1am52°F11°C13 mph21 km/h WestDrizzle
2am53°F12°C13 mph20 km/h WestMostly Cloudy
3am53°F12°C13 mph20 km/h WestMostly Cloudy
DateLowHighWindDayNight
June 655°F13°C63°F17°C11 mph18 km/h from SouthwestDrizzleRain
June 748°F9°C61°F16°C13 mph22 km/h from WestDrizzleClear
June 843°F6°C65°F18°C6 mph9 km/h from WestPartly CloudyPartly Cloudy
June 948°F9°C71°F22°C6 mph10 km/h from WestMostly CloudyMostly Clear
June 1050°F10°C78°F25°C4 mph6 km/h from EastClearMostly Clear
June 1158°F14°C83°F28°C8 mph13 km/h from SoutheastMostly ClearMostly Clear
June 1262°F17°C83°F28°C3 mph5 km/h from SouthPartly CloudyDrizzle

Yes

Low of 48°F9°C, High of 61°F16°C
Wind: 13 mph22 km/h
Precipitation: 54% rain

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