Historical weather data, all-time temperature records, and monthly climate averages for Mandan, ND. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Mandan is a coin-flip kind of day — 110 years of data show highs averaging just 48° with lows dipping to 25°, but the range is wild. This date has seen a balmy 77° (1991) and a brutal 0° low (1996), sometimes just years apart. Snow is still on the table with a 10% chance, so don't put the winter coat away just yet.
Mandan doesn't mess around at the extremes — this is a place that hit 115° in July 1936 and then bottomed out at -46° that same February, a swing of 161 degrees within a single year. A November 2022 storm buried the city under 24 inches of snow in one day, and a July 2001 downpour dumped 4.44 inches in 24 hours. The climate here earns its reputation as one of the most volatile in the continental U.S.
Mandan runs hot in summer and brutally cold in winter — average highs peak at 85° during the week of July 16–22 and crater to just 20° in mid-January. If you're planning a visit, June is your wettest bet with nearly 0.84 inches of precipitation in its rainiest week. Spring and fall offer mild shoulder seasons, but both come with a real chance of snow well into April and again by November.