Historical weather data, all-time temperature records, and monthly climate averages for Herrin, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Herrin typically lands right in the sweet spot of spring, with an average high of 66° and low of 41°. There's about a 1-in-3 chance of rain today, though snow is essentially off the table. The date has seen wide swings historically — from a balmy 85° in 1934 down to a frigid 23° back in 1900.
Herrin's weather history is not for the faint of heart. The thermometer has reached a scorching 113° in August 1930 and plunged to -25° in January 1977 — a jaw-dropping 138-degree spread between the all-time extremes. A single June day in 2000 dumped 6.9 inches of rain, and a February storm in 1979 buried the area under 10 inches of snow.
Herrin runs hot in summer and mild the rest of the year by Midwest standards, with highs peaking around 91° in late July and bottoming out near 42° in early January. Spring is when the rain really arrives — the wettest week of the year falls in early May, averaging over an inch of precipitation. If you're planning a visit, late September and October offer warm days in the low 70s with far less rainfall.