St. Helen, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Helen, a community in Roscommon County, Michigan.
This Afternoon
72°F
Mostly Cloudy
Mostly cloudy. High near 72, with temperatures falling to around 68 in the afternoon. South wind around 5 mph.
7-day forecast for St. Helen
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Mostly Cloudy | 5 mph S | 7% |
| Tonight | 57°F | Mostly Cloudy | 5 to 10 mph S | 8% |
| Wednesday | 68°F | Rain Showers | 5 to 10 mph S | 84% |
| Wednesday Night | 46°F | Rain Showers | 5 to 10 mph S | 79% |
| Thursday | 54°F | Rain Showers | 5 to 10 mph SW | 82% |
| Thursday Night | 36°F | Rain Showers | 0 to 5 mph NW | 82% |
| Friday | 47°F | Rain Showers | 5 to 10 mph N | 81% |
| Friday Night | 29°F | Chance Rain Showers | 5 mph N | 33% |
| Saturday | 50°F | Partly 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 | 5 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% |
Forecast source: National Weather Service (api.weather.gov) for St. Helen (44.359, -84.412). Updated through the day.
Growing snapshot for St. Helen
Last spring frost
May 19
First fall frost
Sep 23
Growing season
125 days
Hardiness zone
5a
More local growing data for St. Helen: nearby ZIP 48656 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Houghton Lk Roscommon Ap, Mi (10.5 mi from St. Helen). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.