Yes

you do need a jacket based on the weather in Nakano, Nagano Prefecture, Japan 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
52°F11°C & Partly Cloudy

Wind is 6 mph9 km/h from the North, gusting to 10 mph16 km/h
October 27
11am51°F11°C6 mph9 km/h NorthPartly Cloudy
12pm51°F10°C5 mph9 km/h NorthPartly Cloudy
1pm50°F10°C6 mph9 km/h NorthPartly Cloudy
2pm49°F9°C5 mph8 km/h NorthPartly Cloudy
3pm48°F9°C5 mph8 km/h NorthPartly Cloudy
4pm47°F8°C4 mph7 km/h NorthPartly Cloudy
5pm45°F7°C4 mph7 km/h NorthMostly Cloudy
6pm45°F7°C2 mph3 km/h NortheastMostly Cloudy
7pm44°F7°C2 mph4 km/h NortheastMostly Cloudy
8pm45°F7°C2 mph4 km/h NortheastMostly Cloudy
9pm45°F7°C3 mph4 km/h NortheastPartly Cloudy
10pm46°F8°C4 mph6 km/h NortheastMostly Cloudy
DateLowHighWindDayNight
October 2648°F9°C63°F17°C5 mph8 km/h from NorthPartly CloudyPartly Cloudy
October 2740°F5°C55°F13°C6 mph9 km/h from NorthPartly CloudyMostly Clear
October 2838°F4°C55°F13°C4 mph6 km/h from NorthPartly CloudyMostly Clear
October 2938°F3°C65°F18°C4 mph6 km/h from SouthwestMostly ClearMostly Cloudy
October 3045°F7°C61°F16°C4 mph6 km/h from SouthRainRain
October 3147°F8°C62°F17°C4 mph6 km/h from NortheastDrizzlePartly Cloudy
November 145°F7°C64°F18°C3 mph4 km/h from NorthPartly CloudyDrizzle

Yes

Low of 40°F5°C, High of 55°F13°C
Wind: 6 mph9 km/h
Precipitation: None

Support This Page