St. Helen, MI Weather & Growing Conditions
Tonight
57°F
Mostly Cloudy
Mostly cloudy. Low around 57, with temperatures rising to around 59 overnight. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Mostly Cloudy | 5 to 10 mph S | 8% |
| Wednesday | 68°F | Rain Showers | 10 mph S | 85% |
| Wednesday Night | 46°F | Rain Showers | 5 to 10 mph S | 77% |
| Thursday | 54°F | Rain Showers | 5 to 10 mph SW | 81% |
| Thursday Night | 37°F | Rain Showers | 0 to 10 mph NW | 81% |
| Friday | 47°F | Rain Showers | 5 to 10 mph N | 81% |
| Friday Night | 30°F | Chance Rain Showers | 5 mph N | 33% |
| Saturday | 50°F | Mostly Sunny | 5 mph NW | 10% |
| Saturday Night | 28°F | Partly Cloudy | 0 to 5 mph W | 6% |
| Sunday | 53°F | Mostly Sunny then Slight Chance Rain Showers | 0 to 10 mph W | 19% |
| Sunday Night | 31°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph NW | 19% |
| Monday | 55°F | Mostly Sunny | 5 to 10 mph W | 8% |
| Monday Night | 35°F | Partly Cloudy | 5 to 10 mph W | 8% |
| Tuesday | 55°F | Mostly Sunny | 5 to 10 mph NW | 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 Nov 4, 2026.