Weather By Day

September Weather In Casper  
September Casper Weather
Record High: 97°F
Normal High: 73°F
Normal Low: 42°F
Record Low: 16°F
Avg Monthly Rain: 0.98"
Rec 1 Day Rain: 2.01"
Avg Monthly Snow: 1.5"
Rec 1 Day Snow: 6.9"

Casper Weather In September

In the last 60 years the highest measured temperature in Casper Wyoming for September was 97 degrees Fahrenheit, most recently encountered on September 1, 1995, and the regular high is 73. The lowest reported temperature in September for Casper for the past 60 years was 16 most recently registered on September 21, 1983, and the average low daily temperature is 42.

US National Weather Service Casper September Weather data records that on September 27, 1984, the high temperature did not exceed 27 degrees Fahrenheit, the lowest high measured in Casper in the past 60 years. Weather Service records additionally indicate that on September 20, 1960, the low for the day was not measured below 66 degrees, the highest low temperature recorded in Casper in the last 60 years.

NWS data indicates that the daily high temperature in Casper on September First averages 81 degrees Fahrenheit and the high on the last day of September averages 70 degrees. The low temperature in Casper in September on the first day of the month averages 48 degrees and the low temperature on the last day of the month averages 38 degrees.

Casper usually receives an average of 0.98 inches of rain during September. The most rain recorded in a single day, as shown by September Casper Weather data, was 2.01 inches on September 20, 1989. Casper averages 1.5 inches of snow in September. The most snow measured in a single day in September was 6.9 inches on September 20, 1995.