St. Johns, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Johns, a city in Clinton County, Michigan.
Today
64°F
Showers And Thunderstorms
Showers and thunderstorms before 4pm, then patchy fog and showers and thunderstorms likely between 4pm and 5pm, then patchy fog and showers and thunderstorms likely. Mostly cloudy. High near 64, with temperatures falling to around 62 in the afternoon. East southeast wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for St. Johns
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Showers And Thunderstorms | 6 to 9 mph ESE | 91% |
| Tonight | 57°F | Patchy Fog | 5 to 9 mph E | 85% |
| Sunday | 69°F | Patchy Fog then Mostly Cloudy | 8 to 15 mph NE | 47% |
| Sunday Night | 48°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 | 3 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) 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 Sep 19, 2026.