Weather By Day

September Sioux City Weather 
September Sioux City Weather
Record High: 102°F
Normal High: 76°F
Normal Low: 50°F
Record Low: 25°F
Avg Monthly Rain: 2.42"
Rec 1 Day Rain: 2.94"

Sioux City Weather In September

The record high September temperature in Sioux City Iowa for the last 70 years was 102 degrees Fahrenheit, measured on September 6, 1976, while the normal high temperature is 76. The record low September temperature in Sioux City for the last 70 years was 25 most recently registered on September 22, 1995, and the regular low is 50.

According to National Weather Service Sioux City September Weather data, on September 28, 1985, the recorded high temperature did not exceed 41 degrees Fahrenheit, the lowest high measured in Sioux City in the past 70 years. Weather Service records additionally show that on September 17, 1955, the recorded low temperature for the day did not drop below 77 degrees, the highest low measured in Sioux City in the last 70 years.

According to the National Weather Service, the high temperature in Sioux City in September on the first day of the month averages 81 degrees and the high on the last day of the month averages 74 degrees. The low recorded temperature in Sioux City on September First averages 59 degrees Fahrenheit and the low temperature on the final day of September averages 46 degrees.

Sioux City usually receives an average of 2.42 inches of rain during the month. September Sioux City Weather records indicated that on September 29, 1965 Sioux City received 2.94 inches of precipitation, the most rain recorded in a single day in September.