Yes

you do need a jacket based on the weather in Lyon, France 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
53°F11°C & Mostly Cloudy

Wind is 2 mph4 km/h from the Northwest, gusting to 7 mph12 km/h
October 25
8pm53°F11°C3 mph4 km/h NorthwestMostly Cloudy
9pm52°F11°C3 mph4 km/h NorthwestMostly Cloudy
10pm51°F10°C2 mph3 km/h NorthwestMostly Cloudy
11pm50°F10°C2 mph3 km/h WestPartly Cloudy
October 26
12am48°F9°C2 mph4 km/h WestMostly Cloudy
1am48°F9°C3 mph4 km/h WestMostly Cloudy
2am48°F9°C2 mph4 km/h WestMostly Cloudy
3am47°F9°C2 mph3 km/h WestMostly Cloudy
4am47°F8°C2 mph4 km/h WestMostly Cloudy
5am46°F8°C3 mph5 km/h NorthwestDrizzle
6am46°F8°C2 mph4 km/h NorthwestDrizzle
7am46°F8°C2 mph4 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
October 2450°F10°C58°F15°C7 mph11 km/h from SouthRainRain
October 2545°F7°C54°F12°C6 mph10 km/h from NorthwestDrizzleMostly Cloudy
October 2644°F7°C56°F13°C5 mph8 km/h from SouthDrizzleDrizzle
October 2747°F8°C61°F16°C1 mph2 km/h from NortheastPartly CloudyPartly Cloudy
October 2843°F6°C63°F17°C6 mph10 km/h from SouthMostly CloudyDrizzle
October 2955°F13°C64°F18°C9 mph14 km/h from SoutheastRainDrizzle
October 3054°F12°C66°F19°C7 mph11 km/h from SouthRainPartly Cloudy

Yes

Low of 45°F7°C, High of 54°F12°C
Wind: 6 mph10 km/h
Precipitation: 54% rain

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