Sun Prairie, MT Monthly Weather

Cascade County12:12 AM MDT47.54°N, 111.48°WElevation 3,340 ft
← September

October 2026

Sun
Mon
Tue
Wed
Thu
Fri
Sat
162°/33°Avg 65°/38°
277°/41°Avg 64°/38°
371°/38°Avg 64°/37°
482°/36°Avg 63°/37°
585°/52°Avg 63°/37°
681°/46°Avg 62°/36°
776°/44°Avg 62°/36°
880°/43°Avg 61°/36°
981°/54°Avg 60°/35°
1056°/31°1.29 in6.4 in snowAvg 60°/35°
1132°/30°0.83 in9.3 in snowAvg 60°/34°
1234°/29°0.03 in0.3 in snowAvg 59°/34°
1341°/30°Avg 58°/34°
1448°/34°Avg 58°/33°
1550°/34°Avg 57°/33°
1669°/41°Avg 57°/32°
1773°/46°Avg 56°/32°
1861°/35°Avg 56°/32°
1974°/32°Avg 55°/31°
2058°/33°Avg 55°/31°
2173°/34°Avg 54°/31°
22Avg 54°/30°
23Avg 53°/30°
24 Mostly Sunny 49°/28°Avg 53°/30°
25 Slight Chance Light Snow then Partly Sunny 43°/25°Avg 52°/29°
26 Partly Sunny 46°/27°Avg 52°/29°
27 Partly Sunny 49°/–Avg 52°/29°
28 Mostly sunny 56°/28°Avg 51°/28°
29 Cloudy 46°/29°Avg 51°/28°
30Avg 50°/28°
31Avg 50°/28°
Average high65° (normal 59°)
Average low38° (normal 34°)
Warmest / coldest85° / 29°
Precipitation2.15 in (normal 0.78 in to date)

Observed: Great Falls Airport, 10 km away, records since 1937. Normals 1991–2020. Climate data from NOAA's Regional Climate Centers (ACIS); recent days are preliminary. Days ahead: the forecast.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.