St. Clair, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Clair, a city in Blue Earth County, Minnesota.
Today
71°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 5pm. Mostly cloudy, with a high near 71. Northwest wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for St. Clair
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Slight Chance Showers And Thunderstorms | 10 mph NW | 19% |
| Tonight | 55°F | Partly Cloudy | 0 to 10 mph WNW | 13% |
| Wednesday | 73°F | Sunny | 0 to 5 mph SW | 1% |
| Wednesday Night | 55°F | Mostly Clear | 0 to 5 mph SSW | 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) for St. Clair (44.084, -93.861). Updated through the day.
Growing snapshot for St. Clair
Last spring frost
Apr 30
First fall frost
Oct 9
Growing season
161 days
Hardiness zone
5a
More local growing data for St. Clair: nearby ZIP 56080 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Amboy
Eagle Lake
Garden City
Good Thunder
Lake Crystal
Madison Lake
Mankato
Mapleton
Minnesota Lake
Pemberton
Skyline
Vernon Center
Climate data from the nearest NOAA station, Mankato, Mn (9.5 mi from St. Clair). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.