St. Clair, MN Weather & Growing Conditions
Today
71°F
Patchy Smoke then Chance Rain Showers
Patchy smoke between 11am and noon, then a chance of rain showers and patchy smoke. Partly sunny, with a high near 71. Northwest wind around 10 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Patchy Smoke then Chance Rain Showers | 10 mph NW | 25% |
| Tonight | 54°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph W | 19% |
| Wednesday | 76°F | Sunny | 0 to 5 mph WSW | 1% |
| Wednesday Night | 55°F | Mostly Clear | 0 to 5 mph S | 0% |
| Thursday | 78°F | Sunny | 5 to 10 mph SSW | 1% |
| Thursday Night | 62°F | Mostly Clear | 10 mph S | 3% |
| Friday | 82°F | Sunny | 10 to 15 mph SSW | 11% |
| Friday Night | 64°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 22% |
| Saturday | 82°F | Sunny | 5 to 10 mph S | 11% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 10 to 15 mph SSE | 45% |
| Sunday | 82°F | Chance Showers And Thunderstorms | 10 mph SSE | 45% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph E | 32% |
| Monday | 80°F | Chance Showers And Thunderstorms | 10 mph ENE | 32% |
| Monday Night | 65°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 23% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Clair, MN
Last spring frost
Apr 30
First fall frost
Oct 9
Growing season
161 days
Hardiness zone
5a
Explore more for St. Clair, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Mankato, Mn (9.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.