Petersburg, MI Weather & Growing Conditions
Today
68°F
Light Rain
Rain. Mostly cloudy. High near 68, with temperatures falling to around 65 in the afternoon. South wind 13 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Light Rain | 13 to 16 mph S | 97% |
| Tonight | 50°F | Light Rain Likely then Mostly Cloudy | 8 to 13 mph SW | 60% |
| Thursday | 60°F | Mostly Cloudy | 9 to 16 mph SW | 7% |
| Thursday Night | 44°F | Mostly Cloudy then Chance Light Rain | 3 to 9 mph W | 36% |
| Friday | 53°F | Chance Light Rain | 3 to 8 mph NW | 48% |
| Friday Night | 35°F | Chance Light Rain | 8 mph NW | 43% |
| Saturday | 51°F | Slight Chance Light Rain then Partly Sunny | 10 mph NW | 17% |
| Saturday Night | 31°F | Partly Cloudy | 6 mph WNW | 2% |
| Sunday | 56°F | Mostly Sunny | 5 to 13 mph W | 5% |
| Sunday Night | 33°F | Partly Cloudy | 5 to 9 mph W | 5% |
| Monday | 58°F | Mostly Sunny | 6 to 10 mph WSW | 2% |
| Monday Night | 37°F | Partly Cloudy | 8 mph SW | 1% |
| Tuesday | 61°F | Mostly Sunny | 10 mph W | 2% |
| Tuesday Night | 34°F | Slight Chance Light Rain | 3 to 7 mph WNW | 15% |
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 Nov 4, 2026.