Gwinn, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gwinn, a community in Marquette County, Michigan.
Today
79°F
Mostly Cloudy then Chance Showers And Thunderstorms
A slight chance of rain showers between 1pm and 2pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 79, with temperatures falling to around 73 in the afternoon. West wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
7-day forecast for Gwinn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph W | 41% |
| Tonight | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 5 mph N | 21% |
| Wednesday | 77°F | Mostly Sunny | 0 to 5 mph NW | 3% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 10 mph SE | 1% |
| Thursday | 83°F | Sunny | 5 to 10 mph SW | 2% |
| Thursday Night | 60°F | Mostly Clear | 10 mph S | 2% |
| Friday | 86°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 18% |
| Friday Night | 62°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 36% |
| Saturday | 82°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 35% |
| Saturday Night | 58°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 42% |
| Sunday | 80°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 42% |
| Sunday Night | 56°F | Chance Showers And Thunderstorms | 0 to 10 mph NW | 38% |
| Monday | 77°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph NW | 22% |
| Monday Night | 55°F | Slight Chance Showers And Thunderstorms | 0 to 10 mph N | 22% |
Forecast source: National Weather Service (api.weather.gov) for Gwinn (46.285, -87.442). Updated through the day.
Growing snapshot for Gwinn
Last spring frost
May 13
First fall frost
Oct 2
Growing season
141 days
Hardiness zone
5a
More local growing data for Gwinn: nearby ZIP 49841 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Big Bay
Harvey
Ishpeming
K. I. Sawyer
Marquette
Michigamme
Negaunee
Palmer
Republic
Rock
Trowbridge Park
West Ishpeming
Climate data from the nearest NOAA station, Ki Sawyer Wwtp, Mi (7.4 mi from Gwinn). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.