Historical weather data, all-time temperature records, and monthly climate averages for Union, MO. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Union runs mild on average, with highs around 60° and lows near 36°—classic early spring ambivalence. The date has seen wild swings though: a shirt-sleeve 85° back in 1988, and a bitter 21° low as recently as 2018. There's a 30% chance of rain today, but snow is essentially off the table.
Union has earned its weather stripes over the decades, swinging from a scorching 107° in August 1984 to a bone-chilling -26° in January 2014—a range of 133 degrees. On the wet side, a single day in May 2000 dropped 9.47 inches of rain, and a February storm in 1984 buried the area under 13 inches of snow.
Summers in Union are legitimately hot, with the peak week of July 9–15 averaging highs of 88°, while mid-January bottoms out around 38°. If you're trying to stay dry, avoid late April into early May—the wettest stretch of the year averages 1.46 inches in a single week. Spring and fall offer the most comfortable windows, with April and October both landing in the upper 60s.