Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Great Falls, Great Falls International Airport (KGTF)

Lat: 47.47333° N Lon: 111.38222° W Elev: 3675.0 ft.

Clear

77°F

25°C

Humidity 43%
Wind Speed SW 13 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 17 Aug 05:53 PM MDT
Detailed forecast for

Cascade County below 5000ft

Tonight
Mostly cloudy with a 20 percent chance of thunderstorms in the evening, then mostly clear after midnight. Lows 55 to 60. South winds up to 10 mph.
Monday
Partly cloudy in the morning, then sunny with a 20 percent chance of rain showers in the afternoon. Highs 85 to 90. Southwest winds up to 10 mph.
Monday Night
Mostly clear. Lows around 60. Southwest winds up to 10 mph.
Tuesday
Sunny. Highs around 95. Southwest winds up to 10 mph.
Tuesday Night
Partly cloudy. Lows around 60. West winds 5 to 10 mph.
Wednesday
Sunny. Highs 90 to 95.
Wednesday Night
Partly cloudy. Lows around 55.
Thursday And Thursday Night
Not as warm. Mostly clear. Highs 80 to 85. Lows 50 to 55.
Friday Through Sunday
Mostly clear. Highs 75 to 85. Lows 50 to 55.



Basemap Options
Click map to change the forecast location
Loading map...
216 PM MDT Sun Aug 17 2025
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database