Yes

you do need a jacket based on the weather in St Clair, MI 48079, USA 1 second ago

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
47°F8°C & Cloudy

Wind is 6 mph10 km/h from the North, gusting to 16 mph25 km/h
May 19
2am48°F9°C7 mph11 km/h NorthCloudy
3am47°F8°C7 mph11 km/h NorthCloudy
4am47°F8°C8 mph12 km/h NorthCloudy
5am46°F8°C8 mph13 km/h NorthCloudy
6am47°F8°C8 mph12 km/h NorthCloudy
7am47°F8°C8 mph13 km/h NorthCloudy
8am47°F9°C9 mph15 km/h NorthMostly Cloudy
9am49°F10°C11 mph17 km/h NorthMostly Cloudy
10am51°F11°C11 mph18 km/h NorthPartly Cloudy
11am53°F11°C12 mph19 km/h NorthPartly Cloudy
12pm55°F13°C12 mph20 km/h NorthMostly Clear
1pm56°F13°C13 mph22 km/h NorthMostly Clear
DateLowHighWindDayNight
May 1943°F6°C56°F13°C13 mph20 km/h from NorthPartly CloudyPartly Cloudy
May 2040°F4°C60°F16°C9 mph15 km/h from EastCloudyDrizzle
May 2148°F9°C56°F13°C13 mph20 km/h from NortheastDrizzleDrizzle
May 2246°F8°C53°F12°C12 mph20 km/h from NorthDrizzleCloudy
May 2343°F6°C54°F12°C10 mph17 km/h from NorthwestDrizzleMostly Cloudy
May 2447°F8°C61°F16°C8 mph13 km/h from NorthwestMostly CloudyMostly Cloudy
May 2548°F9°C63°F17°C6 mph9 km/h from NorthMostly CloudyMostly Clear

Yes

Low of 40°F5°C, High of 60°F16°C
Wind: 9 mph15 km/h
Precipitation: None

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