Weather By Day

May Waterloo Weather 
May Waterloo Weather
Record High: 94°F
Normal High: 72°F
Normal Low: 48°F
Record Low: 22°F
Avg Monthly Rain: 4.15"
Rec 1 Day Rain: 3.41"

Waterloo Weather In May

The hottest day in Waterloo Iowa in May for the past 62 years was 94 degrees Fahrenheit, most recently encountered on May 25, 1967, and the normal high is 72. The record low May temperature in Waterloo for the last 62 years was 22 most recently encountered on May 2, 2005, and the average low daily temperature is 48.

According to National Weather Service historical Waterloo May Weather data, on May 4, 1954, the high temperature did not exceed 38 degrees Fahrenheit, the lowest high measured in Waterloo in the past 62 years. Weather Service records also indicate that on May 28, 2006, the low temperature for the day was not measured below 72 degrees, the highest low measured in Waterloo in the last 62 years.

NWS data indicates that the daily high temperature in Waterloo on May First averages 65 degrees Fahrenheit and the high on the last day of May averages 75 degrees. The low recorded temperature in Waterloo on May First averages 42 degrees Fahrenheit and the low temperature on the final day of May averages 53 degrees.

Waterloo typically receives an average of 4.15 inches of rain during the month. May Waterloo Weather records show that on May 29, 1980 Waterloo received 3.41 inches of rain, the most rain measured in a single day in May.