St. Clair, MN Weather & Growing Conditions
This Afternoon
57°F
Light Rain
Rain and patchy fog. Cloudy. High near 57, with temperatures falling to around 54 in the afternoon. North northwest wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Light Rain | 10 to 15 mph NNW | 100% |
| Tonight | 45°F | Rain | 10 mph NW | 98% |
| Wednesday | 50°F | Light Rain | 10 to 15 mph WNW | 98% |
| Wednesday Night | 41°F | Light Rain | 10 to 15 mph NW | 98% |
| Thursday | 48°F | Light Rain Likely | 15 mph NNW | 55% |
| Thursday Night | 34°F | Mostly Cloudy | 5 to 10 mph N | 10% |
| Friday | 46°F | Mostly Sunny | 0 to 5 mph NNE | 0% |
| Friday Night | 30°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 50°F | Mostly Sunny | 0 to 5 mph SW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 5 mph WSW | 3% |
| Sunday | 54°F | Sunny | 5 to 10 mph W | 4% |
| Sunday Night | 36°F | Partly Cloudy | 5 mph SSW | 3% |
| Monday | 60°F | Mostly Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 5 mph WNW | 0% |
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 Nov 4, 2026.