Yes

you do need a jacket based on the weather in Boise, ID, USA 1 second ago

Why? Because there's a refreshing nip in the air!
42°F6°C & Mostly Cloudy

Wind is 3 mph5 km/h from the Southeast, gusting to 5 mph8 km/h
October 15
12pm42°F6°C3 mph5 km/h SoutheastMostly Cloudy
1pm42°F6°C2 mph3 km/h SoutheastMostly Cloudy
2pm42°F6°C3 mph5 km/h EastDrizzle
3pm43°F6°C2 mph3 km/h SoutheastDrizzle
4pm45°F7°C2 mph4 km/h WestDrizzle
5pm48°F9°C3 mph5 km/h SouthMostly Cloudy
6pm51°F11°C3 mph5 km/h SouthwestMostly Cloudy
7pm54°F12°C4 mph6 km/h WestMostly Cloudy
8pm56°F13°C4 mph7 km/h WestPartly Cloudy
9pm57°F14°C6 mph9 km/h WestPartly Cloudy
10pm59°F15°C6 mph9 km/h NorthwestPartly Cloudy
11pm59°F15°C7 mph11 km/h NorthwestMostly Clear
DateLowHighWindDayNight
October 1541°F5°C59°F15°C4 mph7 km/h from WestDrizzleClear
October 1638°F3°C58°F15°C8 mph13 km/h from NorthwestClearPartly Cloudy
October 1740°F4°C61°F16°C5 mph8 km/h from NorthwestMostly ClearMostly Clear
October 1839°F4°C62°F17°C3 mph4 km/h from SouthClearClear
October 1947°F8°C65°F18°C9 mph14 km/h from SouthPartly CloudyMostly Clear
October 2037°F3°C55°F13°C4 mph6 km/h from NorthwestMostly ClearMostly Clear
October 2138°F3°C59°F15°C3 mph5 km/h from SouthPartly CloudyPartly Cloudy

Yes

Low of 38°F4°C, High of 58°F15°C
Wind: 8 mph13 km/h
Precipitation: None

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