Historical weather data, all-time temperature records, and monthly climate averages for Leavenworth, KS. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Leavenworth runs the full gamut — historically, this date has swung from a bitter 17° in 2018 to a downright summery 85° just last year in 2023. Expect something in between, with a typical high near 59° and low around 38°. There's a 32% chance of rain and a small but real 8% shot at snow.
Leavenworth weather doesn't mess around — the all-time record high of 109° in August 1984 and a bone-chilling -23° in December 1989 represent a 132-degree swing in extremes. A single day in September 1977 dumped 8.82 inches of rain, and January 2025 brought 11 inches of snow in one shot.
Summer is the main event here, with highs averaging 90° during the hottest week of mid-July and staying in the upper 80s through August. Winters are cold but not brutal, with January highs averaging just 37°. If you're trying to dodge rain, avoid mid-May, when Leavenworth averages 1.34 inches in a single week.