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
56°F
Chance Showers And Thunderstorms
A chance of rain showers between 3am and 5am, then a chance of showers and thunderstorms. Mostly cloudy. Low around 56, with temperatures rising to around 61 overnight. East wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Three Rivers
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 41% |
| Saturday | 72°F | Showers And Thunderstorms | 5 to 10 mph SE | 86% |
| Saturday Night | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph S | 86% |
| Sunday | 70°F | Rain Showers Likely | 5 to 15 mph N | 66% |
| Sunday Night | 51°F | Chance Rain Showers then Mostly Cloudy | 10 mph NE | 31% |
| Monday | 64°F | Slight Chance Rain Showers | 10 to 15 mph NE | 15% |
| Monday Night | 47°F | Mostly Cloudy | 10 to 15 mph NE | 13% |
| Tuesday | 64°F | Partly Sunny | 10 to 15 mph NE | 12% |
| Tuesday Night | 49°F | Slight Chance Rain Showers | 10 to 15 mph NE | 19% |
| Wednesday | 64°F | Slight Chance Rain Showers | 10 mph NE | 19% |
| Wednesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 12% |
| Thursday | 67°F | Partly Sunny | 5 to 10 mph NE | 6% |
| Thursday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Friday | 70°F | Mostly Sunny | 5 mph NE | 7% |
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 Sep 19, 2026.