Onamia, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onamia, a city in Mille Lacs County, Minnesota.
Overnight
48°F
Light Rain Likely
Rain likely and patchy fog. Cloudy, with a low around 48. North wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Onamia
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 48°F | Light Rain Likely | 10 mph N | 74% |
| Wednesday | 51°F | Light Rain | 10 to 15 mph N | 96% |
| Wednesday Night | 38°F | Light Rain then Slight Chance Drizzle | 15 mph N | 85% |
| Thursday | 43°F | Mostly Cloudy | 10 to 15 mph N | 11% |
| Thursday Night | 27°F | Partly Cloudy | 0 to 10 mph NE | 0% |
| Friday | 42°F | Sunny | 0 mph | 0% |
| Friday Night | 25°F | Mostly Clear | 0 mph | 0% |
| Saturday | 46°F | Mostly Sunny | 0 to 10 mph SW | 4% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph W | 6% |
| Sunday | 50°F | Sunny | 5 to 10 mph W | 3% |
| Sunday Night | 33°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Monday | 55°F | Mostly Sunny | 5 to 10 mph WSW | 1% |
| Monday Night | 35°F | Partly Cloudy | 5 mph WNW | 1% |
| Tuesday | 51°F | Mostly Sunny | 5 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Onamia (46.070, -93.667). Updated through the day.
Growing snapshot for Onamia
Last spring frost
May 10
First fall frost
Oct 3
Growing season
144 days
Hardiness zone
4a
More local growing data for Onamia: nearby ZIP 56359 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Isle 12N, Mn (17.1 mi from Onamia). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.