Historical weather data, all-time temperature records, and monthly climate averages for Waterloo, IA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Waterloo sits right in the thick of spring transition — expect a high near 54° and a low that can still dip to freezing at 31°. The date has seen wild swings over 76 years of records, from a balmy 84° in 1991 to a brutal 9° low back in 1982. There's a 29% chance of some precipitation today, but snow is unlikely at just 4%.
Waterloo earns its Midwest stripes with some genuinely extreme weather on the books. The thermometer has swung from a scorching 105° on July 31, 1988, all the way down to -34° on January 16, 2009 — a range of 139 degrees. A single storm dropped 5.49 inches of rain on July 2, 1999, and the city once buried itself under 13.2 inches of snow in a single January day in 1971.
Waterloo runs hot in summer and brutally cold in winter, with not much in between. Peak warmth arrives mid-July when highs average 85°, while mid-January highs barely crack 25°. Plan for the wettest stretch in late June, where a week's worth of storms can average over an inch of rain — classic Iowa severe weather season.