St. Johns, MI Weather & Growing Conditions
This Afternoon
64°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 4pm, then patchy fog and showers and thunderstorms likely between 4pm and 5pm, then patchy fog and showers and thunderstorms likely. Cloudy. High near 64, with temperatures falling to around 62 in the afternoon. East southeast wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Showers And Thunderstorms Likely | 9 mph ESE | 68% |
| Tonight | 57°F | Patchy Fog | 5 to 9 mph E | 84% |
| Sunday | 69°F | Patchy Fog then Mostly Cloudy | 8 to 15 mph NE | 46% |
| Sunday Night | 49°F | Partly Cloudy | 9 to 14 mph NE | 1% |
| Monday | 62°F | Mostly Cloudy | 12 to 15 mph NE | 1% |
| Monday Night | 45°F | Mostly Cloudy | 10 to 15 mph NE | 2% |
| Tuesday | 62°F | Partly Sunny | 10 to 16 mph NE | 4% |
| Tuesday Night | 47°F | Mostly Cloudy then Chance Rain Showers | 15 mph NE | 32% |
| Wednesday | 63°F | Chance Rain Showers | 15 mph ENE | 43% |
| Wednesday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 7 to 13 mph NE | 43% |
| Thursday | 66°F | Mostly Cloudy | 7 to 10 mph NE | 7% |
| Thursday Night | 48°F | Mostly Cloudy | 5 to 10 mph NE | 7% |
| Friday | 70°F | Mostly Sunny | 5 to 10 mph NE | 6% |
| Friday Night | 47°F | Partly Cloudy | 3 to 8 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Johns, MI
Last spring frost
Apr 28
First fall frost
Oct 24
Growing season
179 days
Hardiness zone
6a
Explore more for St. Johns, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Saint Johns, Mi (1.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.