Typical Weather in Decatur;, IL in January
36° F Avg High
19° F Avg Low
4 Rainy Days
☀️ Temperature Summary
Highs in January are typically around 36°F, which is cooler than usual in Decatur;. Pack a jacket if you're considering a visit to Decatur; at this time. Overnight lows can reach 19°F. This is the coldest month of the year in Decatur;.
You may want to consider a warmer month to visit Decatur;, unless you're ready to brave the cold.
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 14% chance of rain for any given day in January. It's one of the drier months of the year for Decatur;, with total rainfall for the month around 2 inches.
Rainfall Throughout the Year
Planning a trip to Decatur;? Try our free trip weather planner