Onamia, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onamia, a city in Mille Lacs County, Minnesota.
Tonight
51°F
Rain Showers Likely
Rain showers likely and patchy fog before 1am, then a chance of drizzle between 1am and 3am. Cloudy, with a low around 51. East wind 5 to 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 |
|---|---|---|---|---|
| Tonight | 51°F | Rain Showers Likely | 5 to 10 mph E | 66% |
| Saturday | 63°F | Mostly Cloudy | 5 to 10 mph ENE | 7% |
| Saturday Night | 48°F | Partly Cloudy | 5 mph NE | 1% |
| Sunday | 65°F | Partly Sunny | 5 to 10 mph NE | 0% |
| Sunday Night | 43°F | Mostly Cloudy | 5 to 10 mph ENE | 0% |
| Monday | 62°F | Partly Sunny | 5 mph E | 2% |
| Monday Night | 40°F | Partly Cloudy | 0 to 5 mph E | 1% |
| Tuesday | 63°F | Mostly Sunny | 0 to 5 mph ESE | 1% |
| Tuesday Night | 41°F | Mostly Clear | 0 to 5 mph ESE | 0% |
| Wednesday | 65°F | Sunny | 0 to 5 mph SE | 1% |
| Wednesday Night | 45°F | Partly Cloudy | 0 to 5 mph SSE | 12% |
| Thursday | 67°F | Mostly Sunny | 0 to 5 mph S | 12% |
| Thursday Night | 48°F | Partly Cloudy | 0 to 5 mph SSE | 5% |
| Friday | 70°F | Mostly Sunny | 0 to 10 mph SE | 8% |
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 Sep 19, 2026.