Weather By Day

September Weather In Great Falls  
September Great Falls Weather
Record High: 100°F
Normal High: 70°F
Normal Low: 41°F
Record Low: 10°F
Avg Monthly Rain: 1.23"
Rec 1 Day Rain: 1.51"
Avg Monthly Snow: 1.5"
Rec 1 Day Snow: 6.1"

Great Falls Weather In September

The record high temperature in Great Falls for the last 73 years in September was 100 degrees Fahrenheit, most recently encountered on September 6, 1893, while the typical high temperature is 70. In the last 73 years the highest reported temperature in Great Falls for September was 10 on September 24, 1926, and the mean daily low in the month is 41.

US National Weather Service historical Great Falls September Weather data records that on September 24, 1934, the high temperature did not exceed 26 degrees Fahrenheit, the lowest high measured in Great Falls in the past 73 years. NWS weather data additionally shows that on September 2, 1945, the lowest recorded temperature on that day did not drop below 68 degrees, the highest low measured in Great Falls in the last 73 years.

NWS data indicates that the daily high temperature in Great Falls on September First averages 77 degrees Fahrenheit and the high on the last day of September averages 67 degrees. The low recorded temperature in Great Falls on September First averages 49 degrees Fahrenheit and the low temperature on the final day of September averages 41 degrees.

Great Falls normally receives an average of 1.23 inches of rain during September. The most precipitation recorded on a single day in September, according to September Great Falls Weather data, was 1.51 inches on September 19, 1925. Great Falls averages 1.5 inches of snow in September. The most snow recorded in a single day in September was 6.1 inches on September 25, 1908.