Three Rivers, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Three Rivers, a city in St. Joseph County, Michigan.
This Afternoon
73°F
Mostly Sunny
Mostly sunny, with a high near 73. South wind around 15 mph, with gusts as high as 30 mph.
7-day forecast for Three Rivers
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Sunny | 15 mph S | 3% |
| Tonight | 62°F | Partly Cloudy then Chance Rain Showers | 10 to 15 mph S | 37% |
| Wednesday | 70°F | Rain Showers | 15 mph S | 75% |
| Wednesday Night | 50°F | Mostly Cloudy | 10 mph SW | 11% |
| Thursday | 59°F | Slight Chance Rain Showers | 10 to 15 mph SW | 16% |
| Thursday Night | 45°F | Slight Chance Rain Showers | 5 to 10 mph W | 23% |
| Friday | 54°F | Chance Rain Showers | 5 to 10 mph NW | 31% |
| Friday Night | 36°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph N | 17% |
| Saturday | 51°F | Partly Sunny | 5 to 10 mph NW | 12% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph W | 4% |
| Sunday | 55°F | Mostly Sunny then Slight Chance Rain Showers | 5 to 10 mph W | 21% |
| Sunday Night | 35°F | Slight Chance Rain Showers | 5 to 10 mph W | 21% |
| Monday | 59°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph W | 15% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph SW | 5% |
Forecast source: National Weather Service (api.weather.gov) for Three Rivers (41.945, -85.630). Updated through the day.
Growing snapshot for Three Rivers
Last spring frost
Apr 30
First fall frost
Oct 17
Growing season
170 days
Hardiness zone
6a
More local growing data for Three Rivers: nearby ZIP 49093 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Three Rivers, Mi (3.2 mi from Three Rivers). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.