Petersburg, MI Weather & Growing Conditions
Today
82°F
Sunny
Sunny, with a high near 82. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Sunny | 5 mph S | 0% |
| Tonight | 57°F | Mostly Clear | 0 to 5 mph SSE | 0% |
| Wednesday | 85°F | Sunny | 0 to 6 mph WSW | 0% |
| Wednesday Night | 64°F | Partly Cloudy | 5 mph SW | 14% |
| Thursday | 83°F | Showers And Thunderstorms Likely | 2 to 8 mph WSW | 64% |
| Thursday Night | 63°F | Showers And Thunderstorms Likely | 1 to 6 mph WSW | 64% |
| Friday | 83°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 50% |
| Friday Night | 62°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 50% |
| Saturday | 85°F | Mostly Sunny | 3 to 8 mph SW | 11% |
| Saturday Night | 65°F | Mostly Clear then Slight Chance Rain Showers | 7 mph SW | 24% |
| Sunday | 87°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 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). Updated through the day.
Growing snapshot for Petersburg, MI
Last spring frost
Apr 27
First fall frost
Oct 21
Growing season
176 days
Hardiness zone
6a
Explore more for Petersburg, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Dundee, Mi (5.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.