Historical weather data, all-time temperature records, and monthly climate averages for Marshalltown, IA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Marshalltown sits right on the edge of winter's last stand — the average low of 32° means a freeze is still on the table, even as highs climb toward 54°. The date's full range tells the real story: 132 years of data shows lows as brutal as 11° (1975) and highs as summer-like as 86° (1929). There's a 1-in-3 chance of some precipitation today, though snow is nearly off the table at just 2%.
Marshalltown's weather history is not for the faint of heart — this is a place that has seen 112° summer heat (July 14, 1936) and -35° winter cold (February 3, 1996), a swing of 147 degrees between extremes. A single July day in 1962 dumped 6.58 inches of rain, and a March storm in 1959 buried the city under 17.8 inches of snow. Central Iowa does not do subtle.
Summer is short and hot in Marshalltown, with the warmest week of the year (July 9–15) averaging a high of 86° — and winters are legitimately cold, with early January highs averaging just 28°. If you're chasing dry weather, aim for late summer or fall; the wettest stretch runs mid-June, averaging 1.3 inches in a single week. Spring and fall offer pleasant transitions, but both come with unpredictable swings.