Bay City, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bay City, a city in Bay County, Michigan.
Tonight
50°F
Chance Light Rain
A chance of rain. Cloudy. Low around 50, with temperatures rising to around 53 overnight. East northeast wind 5 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Bay City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Chance Light Rain | 5 to 10 mph ENE | 37% |
| Saturday | 66°F | Rain Showers Likely | 5 to 8 mph ESE | 62% |
| Saturday Night | 54°F | Chance Showers And Thunderstorms | 8 mph E | 54% |
| Sunday | 67°F | Chance Rain Showers then Mostly Cloudy | 8 to 16 mph NE | 29% |
| Sunday Night | 51°F | Mostly Cloudy | 13 to 16 mph NE | 3% |
| Monday | 63°F | Mostly Cloudy | 13 to 17 mph NE | 2% |
| Monday Night | 47°F | Mostly Cloudy | 12 to 18 mph NE | 4% |
| Tuesday | 62°F | Partly Sunny | 13 to 18 mph NE | 8% |
| Tuesday Night | 48°F | Mostly Cloudy then Chance Rain Showers | 10 to 18 mph ENE | 32% |
| Wednesday | 64°F | Chance Rain Showers | 14 mph ENE | 40% |
| Wednesday Night | 49°F | Chance Rain Showers | 6 to 14 mph ENE | 32% |
| Thursday | 67°F | Partly Sunny | 6 to 12 mph NE | 11% |
| Thursday Night | 49°F | Mostly Cloudy | 3 to 12 mph NNE | 9% |
| Friday | 69°F | Mostly Sunny | 5 to 10 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Bay City (43.590, -83.888). Updated through the day.
Growing snapshot for Bay City
Last spring frost
Apr 27
First fall frost
Oct 20
Growing season
173 days
Hardiness zone
6a
More local growing data for Bay City: nearby ZIP 48708 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Essexville, Mi (4.1 mi from Bay City). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.