Typical Weather in Decatur;, IL in October
67° F Avg High
45° F Avg Low
6 Rainy Days
☀️ Temperature Summary
Highs in October are typically around 67°F, which is warmer than usual in Decatur;. You can expect overnight lows near 45°F most days. Temperatures will usually fall as the month goes on, with daily high temperatures ranging between 73°F and 59°F.
October is a great time to visit Decatur;, with mild temperatures and sunny days being very common.
High Temps Throughout the Year
🎒 What to Pack
Pick up a few of these items to keep your trip fun and comfortable.
☔ Rain Summary
You can expect about a 19% chance of rain for any given day in October. It's one of the rainier months of the year for Decatur;, with total rainfall for the month around 3 inches.
Rainfall Throughout the Year
Planning a trip to Decatur;? Try our free trip weather planner