Decatur (IL)
October
Weather in Decatur, Illinois for October 2026
Your guide to Decatur weather in October - trends and predictions
In general, the average temperature in Decatur at the beginning of October is 25.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17 °C by the end of October.
With an average of 4 rainy days, Decatur experiences minimal rainfall in October.
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Temperatures
Rain 🌧️
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27
Dry days
4
Rainy days
0
Snow days
21°/9°
Temperatures
22 km/h
Avg max wind
64 %
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 |  Moderate or heavy rain shower | 18° /10° | 11.2 mm | 4 | |
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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 21° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Decatur during October?
In October, Decatur can expect light to moderate rainfall, totaling 39 mm across approximately 4 days. Occasional showers are possible, and planning ahead for them could be helpful.
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 💧
Typically, Decatur has 4 rainy days in October with a total of 39 mm of rainfall.
UV exposure in Decatur during October
Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
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