St. Johns, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Johns, a city in Clinton County, Michigan.
This Afternoon
75°F
Mostly Sunny
Mostly sunny. High near 75, with temperatures falling to around 73 in the afternoon. South southwest wind around 16 mph, with gusts as high as 26 mph.
7-day forecast for St. Johns
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 16 mph SSW | 4% |
| Tonight | 62°F | Partly Cloudy | 10 to 14 mph S | 9% |
| Wednesday | 71°F | Rain Showers | 14 to 17 mph S | 86% |
| Wednesday Night | 50°F | Rain Showers then Mostly Cloudy | 9 to 13 mph SW | 79% |
| Thursday | 59°F | Mostly Cloudy then Chance Rain Showers | 10 to 16 mph SW | 31% |
| Thursday Night | 44°F | Chance Rain Showers | 5 to 9 mph W | 51% |
| Friday | 52°F | Chance Rain Showers | 5 to 12 mph NNW | 53% |
| Friday Night | 35°F | Chance Rain Showers | 7 to 10 mph NNW | 44% |
| Saturday | 51°F | Partly Sunny | 8 mph NW | 11% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph WSW | 4% |
| Sunday | 55°F | Mostly Sunny then Slight Chance Rain Showers | 6 to 12 mph W | 19% |
| Sunday Night | 34°F | Slight Chance Rain Showers then Partly Cloudy | 6 to 10 mph WNW | 19% |
| Monday | 59°F | Mostly Sunny | 6 to 13 mph W | 9% |
| Monday Night | 39°F | Partly Cloudy | 10 mph WSW | 7% |
Forecast source: National Weather Service (api.weather.gov) for St. Johns (43.001, -84.556). Updated through the day.
Growing snapshot for St. Johns
Last spring frost
Apr 28
First fall frost
Oct 24
Growing season
179 days
Hardiness zone
6a
More local growing data for St. Johns: nearby ZIP 48879 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Saint Johns, Mi (1.3 mi from St. Johns). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.