Historical weather data, all-time temperature records, and monthly climate averages for Norwalk, IA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Norwalk sits squarely in the unpredictable heart of Iowa spring — expect a high around 55° and a low near 34°, but history says anything goes. The date has swung from a balmy 83° in 2021 to a bitter 14° in 2018, a 69-degree gap in just a few years. There's a modest 28% chance of precipitation today, with a 6% shot at snow still on the table.
Norwalk's weather has real teeth at both ends of the thermometer — the mercury has climbed to a scorching 108° in August 1983 and plunged to -26° in February 1996, a jaw-dropping 134-degree spread. Summer storms can be equally dramatic: a single day in August 1975 dropped 6.18 inches of rain, and a January 1996 blizzard buried the area under 13.7 inches of snow.
Norwalk runs warm and humid in summer, with highs peaking around 86-87° in mid-July, then cools sharply through fall to a frigid average high of just 29° in early January. If you're planning a visit, June through August offers the warmest stretch but also the wettest — the third week of June averages 1.2 inches of precipitation. Spring and fall are transitional and famously fickle, as today's historical range makes clear.