Onamia, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onamia, a city in Mille Lacs County, Minnesota.
Today
72°F
Sunny
Sunny, with a high near 72. West northwest wind around 10 mph.
7-day forecast for Onamia
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Sunny | 10 mph WNW | 0% |
| Tonight | 51°F | Mostly Clear | 0 to 10 mph W | 0% |
| Wednesday | 77°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 5 to 10 mph SW | 3% |
| Thursday | 82°F | Sunny | 5 to 15 mph SW | 5% |
| Thursday Night | 62°F | Mostly Clear | 5 to 10 mph SSW | 6% |
| Friday | 84°F | Sunny | 5 to 10 mph SW | 9% |
| Friday Night | 60°F | Slight Chance Showers And Thunderstorms | 0 to 10 mph WSW | 23% |
| Saturday | 82°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 18% |
| Saturday Night | 60°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 5 mph NNE | 43% |
| Sunday | 80°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph NNE | 27% |
| Sunday Night | 60°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 15% |
| Monday | 79°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph NNE | 16% |
| Monday Night | 59°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph NNE | 19% |
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 Aug 4, 2026.