Yes

you do need a jacket based on the weather in Geneva, Switzerland 1 second ago

Why? Because it's pretty chilly!
58°F14°C & Clear

Wind is 1 mph1 km/h from the West, gusting to 2 mph4 km/h
September 18
9pm58°F14°C1 mph2 km/h WestClear
10pm57°F14°C1 mph2 km/h WestClear
11pm56°F13°C1 mph2 km/h NorthwestClear
September 19
12am55°F13°C1 mph2 km/h WestClear
1am55°F13°C1 mph2 km/h WestClear
2am56°F13°C1 mph2 km/h WestClear
3am60°F15°C1 mph2 km/h WestClear
4am64°F18°C1 mph1 km/h WestClear
5am68°F20°C1 mph1 km/h NorthwestClear
6am71°F22°C1 mph1 km/h NortheastClear
7am74°F24°C2 mph3 km/h NortheastClear
8am77°F25°C2 mph3 km/h EastClear
DateLowHighWindDayNight
September 1855°F13°C80°F27°C2 mph3 km/h from EastMostly ClearMostly Clear
September 1959°F15°C82°F28°C4 mph6 km/h from SouthwestMostly ClearMostly Clear
September 2059°F15°C72°F22°C3 mph6 km/h from SouthwestRainHeavy Rain
September 2156°F13°C63°F17°C5 mph8 km/h from NortheastDrizzleRain
September 2251°F10°C58°F15°C9 mph14 km/h from NorthRainDrizzle
September 2347°F8°C56°F14°C8 mph13 km/h from NorthDrizzlePartly Cloudy
September 2445°F7°C60°F15°C4 mph6 km/h from NorthMostly CloudyMostly Cloudy

No

Low of 59°F15°C, High of 82°F28°C
Wind: 4 mph6 km/h
Precipitation: None

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