Petersburg, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Petersburg, a city in Monroe County, Michigan.
Today
82°F
Sunny
Sunny, with a high near 82. South wind around 6 mph.
7-day forecast for Petersburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Sunny | 6 mph S | 0% |
| Tonight | 57°F | Mostly Clear | 2 to 7 mph S | 0% |
| Wednesday | 86°F | Sunny | 2 to 8 mph SW | 0% |
| Wednesday Night | 64°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 2 to 7 mph SW | 16% |
| Thursday | 83°F | Showers And Thunderstorms Likely | 2 to 8 mph WSW | 65% |
| Thursday Night | 63°F | Showers And Thunderstorms Likely | 1 to 6 mph WSW | 65% |
| Friday | 83°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 49% |
| Friday Night | 62°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 49% |
| Saturday | 85°F | Mostly Sunny | 3 to 9 mph SW | 11% |
| Saturday Night | 65°F | Mostly Clear then Slight Chance Rain Showers | 3 to 8 mph SW | 24% |
| Sunday | 87°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 to 14 mph SW | 24% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 8 to 14 mph SW | 42% |
| Monday | 86°F | Chance Rain Showers | 10 mph WSW | 42% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 9 mph WSW | 52% |
Forecast source: National Weather Service (api.weather.gov) for Petersburg (41.900, -83.714). Updated through the day.
Growing snapshot for Petersburg
Last spring frost
Apr 27
First fall frost
Oct 21
Growing season
176 days
Hardiness zone
6a
More local growing data for Petersburg: nearby ZIP 49270 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Carleton
Detroit Beach
Dundee
Estral Beach
Ida
Lambertville
Luna Pier
Maybee
Milan
Monroe
South Monroe
South Rockwood
Stony Point
Temperance
West Monroe
Woodland Beach
Climate data from the nearest NOAA station, Dundee, Mi (5.9 mi from Petersburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.