Yes

you do need a jacket based on the weather in Bonn, Germany 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
58°F15°C & Clear

Wind is 3 mph5 km/h from the West, gusting to 8 mph13 km/h
July 4
1am58°F15°C3 mph6 km/h WestClear
2am61°F16°C4 mph6 km/h NorthwestClear
3am64°F18°C5 mph7 km/h NorthwestClear
4am67°F19°C5 mph9 km/h NorthwestClear
5am70°F21°C6 mph10 km/h NorthwestClear
6am72°F22°C6 mph10 km/h NorthwestClear
7am74°F23°C6 mph10 km/h NorthwestMostly Clear
8am75°F24°C6 mph9 km/h NorthwestMostly Clear
9am76°F25°C5 mph9 km/h NorthwestPartly Cloudy
10am77°F25°C5 mph9 km/h NorthwestMostly Cloudy
11am77°F25°C5 mph8 km/h NorthwestMostly Cloudy
12pm76°F25°C5 mph8 km/h NorthwestMostly Cloudy
DateLowHighWindDayNight
July 356°F13°C77°F25°C5 mph8 km/h from NorthwestMostly ClearPartly Cloudy
July 455°F13°C79°F26°C7 mph11 km/h from WestMostly CloudyDrizzle
July 559°F15°C69°F21°C7 mph12 km/h from SouthwestDrizzleRain
July 656°F13°C67°F20°C8 mph13 km/h from WestRainRain
July 754°F12°C69°F21°C12 mph19 km/h from NorthwestDrizzlePartly Cloudy
July 852°F11°C73°F23°C7 mph12 km/h from NorthwestPartly CloudyMostly Clear
July 955°F13°C80°F26°C4 mph6 km/h from NorthwestMostly ClearPartly Cloudy

Yes

Low of 55°F13°C, High of 80°F27°C
Wind: 7 mph11 km/h
Precipitation: None

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