Historical weather data, all-time temperature records, and monthly climate averages for Grain Valley, MO. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Grain Valley swings wide — this date has seen a balmy 81° (2005) and a brutal 18° low (2018), a 63-degree spread that captures Missouri spring in a nutshell. On average, expect a high near 58° and a low of 37°, with roughly a 1-in-3 chance of rain.
Grain Valley has earned its Midwest stripes: temperatures here have ranged from a scorching 107° in August 2003 all the way down to -14° in January 2019, a swing of 121 degrees. A single day in May 2007 dropped 6.38 inches of rain, and a February 2011 snowstorm buried the area under 11.5 inches.
Summer is the main event — highs average 89° in late July and stay in the mid-to-upper 80s through August. If you're avoiding the cold, January is the low point with average highs of just 37°. Rain peaks in late June through early July, so pack accordingly for summer visits.