Petersburg, MI Weather & Growing Conditions
This Afternoon
70°F
Showers And Thunderstorms
Showers and thunderstorms before 3pm, then a chance of showers and thunderstorms between 3pm and 5pm, then a chance of showers and thunderstorms. Cloudy. High near 70, with temperatures falling to around 66 in the afternoon. East southeast wind around 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Showers And Thunderstorms | 8 mph ESE | 80% |
| Tonight | 61°F | Showers And Thunderstorms Likely | 3 to 7 mph ESE | 81% |
| Sunday | 70°F | Patchy Fog | 6 to 12 mph NNW | 66% |
| Sunday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 12 mph NE | 19% |
| Monday | 63°F | Mostly Cloudy | 12 to 15 mph NE | 13% |
| Monday Night | 48°F | Mostly Cloudy | 14 mph NE | 14% |
| Tuesday | 62°F | Mostly Cloudy then Slight Chance Rain Showers | 15 to 18 mph NE | 17% |
| Tuesday Night | 50°F | Chance Rain Showers | 16 mph ENE | 50% |
| Wednesday | 62°F | Rain Showers Likely | 16 mph ENE | 58% |
| Wednesday Night | 50°F | Showers And Thunderstorms Likely | 7 to 13 mph ENE | 58% |
| Thursday | 64°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NE | 19% |
| Thursday Night | 50°F | Mostly Cloudy | 5 to 9 mph NE | 11% |
| Friday | 68°F | Mostly Sunny | 9 mph NE | 10% |
| Friday Night | 49°F | Partly Cloudy | 7 mph NE | 7% |
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 Sep 19, 2026.