Des Moines averages 24.3 days a year above 90°F, with June the wettest month at 5.26 in of normal rain. The hottest day on record was 108°F on Aug 16, 1983; the coldest, −26°F on Feb 3, 1996. The single biggest 24-hour rain event recorded was 6.18 in on Aug 27, 1975.
Climate and Average Weather Year Round in Des Moines
Year-round temperature
In Des Moines, the warmest months are June through September, with average daily highs between 77°F and 86°F. The coldest stretch runs December through February, with highs between 31°F and 36°F and overnight lows reaching 14°F.
Rainfall through the year
Rainfall in Des Moines averages 3.0 in per month over the long run. June is the wettest at 5.3 in, while January is the driest at 1.1 in.
Days at 90 °F or hotter
Des Moines averages 24.3 days per year at 90 °F or hotter. The hottest year on record saw 60 such days (2012); the coolest just 1 (2026).
Precipitation this year
As of May 28, Des Moines has received 12.9 in of precipitation this year — 3% below the long-term normal for this point in the year (13.3 in).