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Thief River Falls, MN Weather & Growing Conditions

Overnight
51°F
Partly Cloudy
Partly cloudy, with a low around 51. East southeast wind around 5 mph.

7-day forecast

WhenTempForecastWindPrecip
Overnight 51°F Partly Cloudy 5 mph ESE 1%
Saturday 69°F Mostly Cloudy then Slight Chance Rain Showers 3 to 13 mph NE 15%
Saturday Night 47°F Partly Cloudy 8 to 13 mph NNE 1%
Sunday 64°F Partly Sunny 10 mph NE 0%
Sunday Night 42°F Mostly Cloudy 5 to 8 mph E 0%
Monday 67°F Sunny 5 to 8 mph SE 0%
Monday Night 40°F Mostly Clear 8 mph SE 0%
Tuesday 67°F Sunny 8 to 14 mph SSE 0%
Tuesday Night 44°F Mostly Clear 9 to 13 mph SSE 1%
Wednesday 68°F Mostly Sunny 13 to 18 mph SSE 2%
Wednesday Night 48°F Partly Cloudy 13 mph SSE 11%
Thursday 70°F Partly Sunny 9 to 14 mph SSE 11%
Thursday Night 52°F Partly Cloudy 12 mph SSE 10%
Friday 73°F Mostly Sunny 10 to 16 mph S 6%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Thief River Falls, MN

Last spring frost
May 14
First fall frost
Sep 28
Growing season
135 days
Hardiness zone
4a

Explore more for Thief River Falls, MN: full frost dates · planting calendar · Minnesota frost dates

Climate data from the nearest NOAA station, Thief Rvr Falls 2, Mn (1.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.