St. Helen, MI Weather & Growing Conditions
Tonight
41°F
Isolated Rain Showers
Isolated rain showers. Mostly cloudy. Low around 41, with temperatures rising to around 44 overnight. East wind around 0 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 41°F | Isolated Rain Showers | 0 mph | 24% |
| Saturday | 63°F | Scattered Rain Showers | 0 to 5 mph SE | 46% |
| Saturday Night | 47°F | Scattered Rain Showers | 0 to 5 mph E | 47% |
| Sunday | 66°F | Scattered Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 37% |
| Sunday Night | 41°F | Mostly Cloudy | 5 to 10 mph NE | 3% |
| Monday | 59°F | Mostly Cloudy | 10 mph NE | 1% |
| Monday Night | 39°F | Mostly Cloudy | 5 to 10 mph NE | 2% |
| Tuesday | 61°F | Partly Sunny | 5 to 15 mph NE | 7% |
| Tuesday Night | 40°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 10 mph NE | 16% |
| Wednesday | 62°F | Chance Rain Showers | 5 to 10 mph NE | 27% |
| Wednesday Night | 42°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 27% |
| Thursday | 65°F | Partly Sunny | 5 mph NE | 8% |
| Thursday Night | 42°F | Partly Cloudy | 0 to 5 mph NE | 7% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph N | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Helen, MI
Last spring frost
May 19
First fall frost
Sep 23
Growing season
125 days
Hardiness zone
5a
Explore more for St. Helen, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Houghton Lk Roscommon Ap, Mi (10.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.