Weather By Day

September Missoula Weather 
September Missoula Weather
Record High: 99°F
Normal High: 72°F
Normal Low: 41°F
Record Low: 20°F
Avg Monthly Rain: 1.08"
Rec 1 Day Rain: 1.3"

Missoula Weather In September

The highest recorded temperature in September for Missoula for the past 66 years was 99 degrees Fahrenheit, most recently encountered on September 28, 1967, and the normal high is 72. The lowest documented temperature for Missoula for the past 66 years in September was 20 on September 23, 2000, while the standard low daily temperature for the month is 41.

United States National Weather Service historical Missoula September Weather data shows that on September 9, 1965, the high temperature did not exceed 40 degrees Fahrenheit, the lowest high measured in Missoula in the past 66 years. Weather Service records additionally show that on September 4, 1950, the recorded low temperature for the day did not drop below 63 degrees, the highest low measured in Missoula in the last 66 years.

National Weather Service records indicate that the high temperature in Missoula on September First averages 78 degrees and the high on the last day of the month averages 67 degrees. The low measured temperature in Missoula on September First averages 45 degrees and the low on the last day of the month averages 37 degrees.

Missoula receives an average of 1.08 inches of precipitation during September. September Missoula Weather records show that on September 15, 1954 Missoula received 1.3 inches of rain, the most rain measured in a single day in September.