Yes

you do need a jacket based on the weather in Montgomery, IL, USA 1 second ago

Why? Because it's so windy, your hat will probably launch into orbit!
67°F19°C & Cloudy

Wind is 12 mph19 km/h from the Northeast, gusting to 26 mph42 km/h
July 31
4am67°F19°C12 mph19 km/h NortheastDrizzle
5am66°F19°C13 mph21 km/h NortheastCloudy
6am66°F19°C12 mph20 km/h NortheastCloudy
7am66°F19°C12 mph19 km/h NortheastMostly Cloudy
8am67°F19°C12 mph19 km/h NortheastPartly Cloudy
9am68°F20°C13 mph21 km/h NortheastPartly Cloudy
10am70°F21°C14 mph23 km/h NortheastPartly Cloudy
11am72°F22°C14 mph23 km/h NortheastMostly Clear
12pm73°F23°C14 mph23 km/h NortheastMostly Clear
1pm75°F24°C14 mph22 km/h NortheastMostly Clear
2pm76°F24°C13 mph21 km/h NortheastMostly Clear
3pm76°F25°C13 mph21 km/h NortheastClear
DateLowHighWindDayNight
July 3161°F16°C77°F25°C13 mph21 km/h from NortheastMostly ClearMostly Clear
August 158°F14°C76°F25°C8 mph13 km/h from NortheastPartly CloudyMostly Clear
August 256°F13°C78°F26°C5 mph8 km/h from NortheastPartly CloudyMostly Clear
August 358°F15°C79°F26°C6 mph9 km/h from EastMostly ClearPartly Cloudy
August 463°F17°C80°F27°C6 mph10 km/h from EastPartly CloudyPartly Cloudy
August 565°F18°C78°F26°C7 mph11 km/h from EastPartly CloudyPartly Cloudy
August 663°F17°C79°F26°C4 mph7 km/h from NortheastPartly CloudyMostly Clear

Yes

Low of 58°F15°C, High of 76°F25°C
Wind: 8 mph13 km/h
Precipitation: None

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