Ontonagon, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ontonagon, a village in Ontonagon County, Michigan.
Tonight
52°F
Rain Showers
Rain showers before midnight, then rain showers and patchy fog. Cloudy. Low around 52, with temperatures rising to around 55 overnight. East wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Ontonagon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Rain Showers | 5 mph E | 88% |
| Wednesday | 61°F | Rain Showers | 5 to 10 mph E | 96% |
| Wednesday Night | 45°F | Rain Showers | 10 to 15 mph NW | 97% |
| Thursday | 46°F | Rain Showers | 20 to 30 mph N | 98% |
| Thursday Night | 33°F | Rain Showers | 15 to 25 mph NE | 79% |
| Friday | 43°F | Partly Sunny | 10 to 15 mph NE | 4% |
| Friday Night | 33°F | Partly Cloudy | 0 to 5 mph SE | 3% |
| Saturday | 47°F | Mostly Sunny | 5 mph SW | 1% |
| Saturday Night | 38°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 15 mph SW | 15% |
| Sunday | 49°F | Slight Chance Rain Showers | 15 to 20 mph W | 15% |
| Sunday Night | 40°F | Slight Chance Rain Showers then Partly Cloudy | 10 to 15 mph W | 15% |
| Monday | 51°F | Partly Sunny | 10 to 15 mph SW | 2% |
| Monday Night | 41°F | Partly Cloudy | 15 mph W | 2% |
| Tuesday | 48°F | Mostly Sunny | 15 to 20 mph W | 4% |
Forecast source: National Weather Service (api.weather.gov) for Ontonagon (46.866, -89.312). Updated through the day.
Growing snapshot for Ontonagon
Last spring frost
May 27
First fall frost
Oct 1
Growing season
127 days
Hardiness zone
5a
More local growing data for Ontonagon: nearby ZIP 49953 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ontonagon 6 Se, Mi (10.9 mi from Ontonagon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.