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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.

Tonight
56°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of rain showers between 2am and 5am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 56. 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

WhenTempForecastWindPrecip
Tonight 56°F Mostly Cloudy then Chance Showers And Thunderstorms 5 to 10 mph E 42%
Saturday 72°F Showers And Thunderstorms 10 mph SE 91%
Saturday Night 61°F Chance Showers And Thunderstorms then Showers And Thunderstorms 5 mph S 87%
Sunday 69°F Rain Showers 5 to 10 mph NE 81%
Sunday Night 51°F Chance Rain Showers 10 to 15 mph NE 50%
Monday 64°F Chance Rain Showers 10 to 15 mph NE 42%
Monday Night 47°F Slight Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 18%
Tuesday 64°F Partly Sunny then Chance Rain Showers 10 to 15 mph NE 27%
Tuesday Night 49°F Chance Rain Showers 10 to 15 mph NE 27%
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

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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.