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.
Overnight
58°F
Clear
Clear, with a low around 58. South wind around 0 mph.
7-day forecast for Three Rivers
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Clear | 0 mph | 0% |
| Tuesday | 83°F | Sunny | 0 to 5 mph S | 0% |
| Tuesday Night | 60°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Wednesday | 83°F | Mostly Sunny then Slight Chance Rain Showers | 5 to 10 mph SW | 20% |
| Wednesday Night | 64°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph SW | 78% |
| Thursday | 79°F | Showers And Thunderstorms | 0 to 5 mph SW | 78% |
| Thursday Night | 61°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph SW | 72% |
| Friday | 82°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 18% |
| Friday Night | 62°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 18% |
| Saturday | 84°F | Mostly Sunny | 0 to 10 mph SW | 12% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 24% |
| Sunday | 86°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 24% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 to 15 mph SW | 40% |
| Monday | 85°F | Chance Rain Showers | 5 to 10 mph SW | 40% |
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 Aug 4, 2026.