Granite Falls Weather Forecast
- 61
- 75
Chance Thunderstorms
- 57
- 71
Rain Showers Likely
- 59
- 72
Chance Rain Showers
- 60
- 80
Chance Rain Showers
- 54
- 78
Slight Chance Thunderstorms
- 53
- 74
Mostly Sunny
Today 18 Sep Yellow Medicine
Mostly cloudy. Slight chance of Thunderstorms early in the morning. Slight chance of Showers in the late morning and early Afternoon, then chance of Showers and slight chance of Thunderstorms late in the afternoon. Highs in the mid 70s. Southeast Winds 5 to 10 Mph. Chance of precipitation 40 percent.
Tonight 18 Sep Yellow Medicine
Mostly cloudy. Chance of Thunderstorms in the Evening, then chance of rain Showers and slight chance of Thunderstorms after midnight. Lows around 60. Southeast Winds up to 5 Mph. Chance of precipitation 50 percent.
Granite Falls Temperature Statistics
September Temperature
Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (3.7 miles)
Lowest 7 September, 2025
37.4 °FAverage September
64.4 °FHighest 14 September, 2025
89.8 °F
Climate (2020–Present)
Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (3.7 miles)
Average Low 2020–2025
37 °FAverage 2020–2025
47.5 °FAverage High 2020–2025
57.9 °F