Decatur (IL)
October
Weather in Decatur, Illinois for October 2025
Your guide to Decatur weather in October - trends and predictions
Until now, October 2025 in Decatur is slightly cooler than the historical average by -0.7 °F.
In general, the average temperature in Decatur at the beginning of October is 25.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.3 °F by the end of October.
With an average of 2 rainy days, Decatur experiences minimal rainfall in October.
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Temperatures
Rain 🌧️
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29
Dry days
2
Rainy days
0
Snow days
22°/8°
Temperatures
22 km/h
Avg max wind
61 %
Avg humidity
Decatur Weather October
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Temperatures trend during October in Decatur
See the weather trend as well as the moving average line
October weather in Decatur day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Oct. 1 |  Fog | 25° /12° | 0 mm | 6 | |
| Oct. 2 |  Cloudy | 27° /10° | 0 mm | 7 | |
| Oct. 3 |  Partly cloudy | 26° /13° | 0 mm | 6 | |
| Oct. 4 |  Overcast | 27° /15° | 0 mm | 6 | |
| Oct. 5 |  Sunny | 29° /13° | 0 mm | 7 | |
| Oct. 6 | Sunny | 27° /14° | 0 mm | 7 | |
| Oct. 7 | Sunny | 20° /8° | 0 mm | 6 | |
| Oct. 8 | Sunny | 22° /6° | 0 mm | 6 | |
| Oct. 9 | Sunny | 23° /6° | 0 mm | 7 | |
| Oct. 10 | Mist | 22° /6° | 0 mm | 5 | |
| Oct. 11 | Sunny | 24° /12° | 0 mm | 6 | |
| Oct. 12 | Overcast | 26° /10° | 0 mm | 6 | |
| Oct. 13 | Overcast | 21° /10° | 0 mm | 5 | |
| Oct. 14 | Overcast | 20° /9° | 0 mm | 5 | |
| Oct. 15 | Overcast | 16° /8° | 0 mm | 4 | |
| Oct. 16 | Sunny | 19° /6° | 0 mm | 5 | |
| Oct. 17 | Sunny | 21° /7° | 0 mm | 5 | |
| Oct. 18 | Sunny | 24° /8° | 13.4 mm | 6 | |
| Oct. 19 | Sunny | 20° /7° | 11.3 mm | 5 | |
| Oct. 20 | Sunny | 22° /5° | 0 mm | 6 | |
| Oct. 21 | Sunny | 21° /8° | 0 mm | 6 | |
| Oct. 22 | Partly cloudy | 20° /5° | 0 mm | 6 | |
| Oct. 23 | Mist | 17° /6° | 0 mm | 4 | |
| Oct. 24 | Partly cloudy | 16° /2° | 0 mm | 5 | |
| Oct. 25 |  Patchy light rain with thunder | 18° /10° | 3 mm | 4 | |
| Oct. 26 | Sunny | 16° /8° | 0 mm | 4 | |
| Oct. 27 | Sunny | 17° /6° | 0 mm | 5 | |
| Oct. 28 | Overcast | 15° /6° | 0 mm | 4 | |
| Oct. 29 | Partly cloudy | 18° /11° | 0 mm | 5 | |
| Oct. 30 | Overcast | 17° /10° | 0 mm | 4 | |
| Oct. 31 | Partly cloudy | 13° /5° | 0 mm | 0.7 | |
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Important Notice
Our weather forecast for Decatur in October 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 Decatur forecast closer to your planned date for the most up-to-date weather information.
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Decatur in October - FAQ
What are the expected maximum and minimum temperatures in Decatur during October?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Decatur during October?
Expect minimal rainfall in Decatur during October, with a total of 17.2 mm over approximately 2 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Decatur during October?
The average wind speed in Decatur during October is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
October rainfall patterns in Decatur
Explore the daily rainfall trends and prepare for Decaturs October weather 💧
UV exposure in Decatur during October
Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
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