Illinois (Chicago)
January
Weather in Illinois for January 2026
Your guide to Illinois weather in January - trends and predictions
Expect heavy snowfall in Illinois during January, with an average of 17 snowy days.
In general, the average temperature in Illinois at the beginning of January is 1.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of -0.1 °F by the end of January.
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Snow Forecast ❄️
Temperatures
More
10
Dry days
4
Rainy days
17
Snow days
0°/-4°
Temperatures
22 km/h
Avg max wind
80 %
Avg humidity
Illinois Weather January
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  3° | 2 2° | 3  2° | ||||
| 4 2° | 5 1° | 6 -0° | 7 -1° | 8 0° | 9 2° | 10 -0° |
| 11 2° | 12 2° | 13 1° | 14  -2° | 15 -2° | 16  -1° | 17 0° |
| 18 -0° | 19 -2° | 20  -5° | 21  -3° | 22 -1° | 23 -2° | 24 -0° |
| 25 -1° | 26 -2° | 27 1° | 28 -1° | 29 1° | 30 -0° | 31 1° |
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Temperatures trend during January in Illinois
See the weather trend as well as the moving average line
January weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Jan. 1 | Overcast | 3° /-1° | 6.8 mm | 3.9 cm | |
| Jan. 2 | Overcast | 2° /-2° | 0.6 mm | 0.1 cm | |
| Jan. 3 | Light freezing rain | 2° /-3° | 4 mm | 0.5 cm | |
| Jan. 4 | Overcast | 2° /-3° | 0 mm | 0 cm | |
| Jan. 5 | Overcast | 1° /-4° | 0.3 mm | 0 cm | |
| Jan. 6 | Overcast | 0° /-3° | 1.1 mm | 0.6 cm | |
| Jan. 7 | Light freezing rain | -1° /-4° | 0.2 mm | 0.1 cm | |
| Jan. 8 | Overcast | 0° /-4° | 0.9 mm | 0.1 cm | |
| Jan. 9 | Overcast | 2° /-5° | 4.1 mm | 1.6 cm | |
| Jan. 10 | Overcast | 0° /-4° | 0.3 mm | 0 cm | |
| Jan. 11 | Overcast | 2° /-5° | 0.3 mm | 0.3 cm | |
| Jan. 12 | Overcast | 2° /-1° | 5.7 mm | 2.1 cm | |
| Jan. 13 | Overcast | 1° /-5° | 1.1 mm | 0 cm | |
| Jan. 14 | Patchy rain possible | -2° /-7° | 1.4 mm | 0 cm | |
| Jan. 15 | Overcast | -2° /-8° | 0.3 mm | 0 cm | |
| Jan. 16 | Patchy moderate snow | -1° /-7° | 1.7 mm | 0.1 cm | |
| Jan. 17 | Light freezing rain | 0° /-5° | 0.4 mm | 0 cm | |
| Jan. 18 | Overcast | 0° /-5° | 1.1 mm | 0.2 cm | |
| Jan. 19 | Overcast | -2° /-9° | 2.7 mm | 0.6 cm | |
| Jan. 20 | Partly cloudy | -5° /-11° | 0 mm | 0 cm | |
| Jan. 21 | Sunny | -3° /-10° | 0 mm | 0 cm | |
| Jan. 22 | Overcast | -1° /-7° | 1.3 mm | 0.1 cm | |
| Jan. 23 | Overcast | -2° /-7° | 4.1 mm | 0.7 cm | |
| Jan. 24 | Patchy moderate snow | 0° /-6° | 2.9 mm | 0.6 cm | |
| Jan. 25 | Patchy moderate snow | -1° /-5° | 4.7 mm | 0.9 cm | |
| Jan. 26 | Partly cloudy | -2° /-6° | 3.8 mm | 1.4 cm | |
| Jan. 27 | Overcast | 1° /-6° | 0.4 mm | 0 cm | |
| Jan. 28 | Partly cloudy | -1° /-6° | 2.2 mm | 0.5 cm | |
| Jan. 29 | Overcast | 1° /-6° | 0.4 mm | 0.1 cm | |
| Jan. 30 | Overcast | 0° /-5° | 2.7 mm | 1.6 cm | |
| Jan. 31 | Overcast | 1° /-5° | 4.1 mm | 1.3 cm | |
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Important Notice
Our weather forecast for Illinois in January is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Illinois forecast closer to your planned date for the most up-to-date weather information.
Illinois in January - FAQ
What are the expected maximum and minimum temperatures in Illinois during January?
Brace for cold days with temperatures not exceeding 0° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Illinois during January?
Moderate rainfall is anticipated in Illinois during January, with a total of 72.3 mm spread over approximately 4 days. Considering plans for rainy days is advisable.
Will it snow in Illinois in January 2026?
Illinois experiences an average snowfall of 21.4475 cm during January, occurring over 17 days.
What are the typical wind conditions in Illinois during January?
The average wind speed in Illinois during January is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
Illinois snow forecast January 2026
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January rainfall patterns in Illinois
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