Decatur (IL)
August
Weather in Decatur, Illinois for August 2027
Your guide to Decatur weather in August - trends and predictions
In general, the average temperature in Decatur at the beginning of August is 27.3 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 29.4 °C by the end of August.
Decatur experiences moderate rainfall in August, with an average of 10 rainy days and a total precipitation of 176.6 mm.
Is August a good time to visit Decatur? check out the best time to travel to Decatur page.
✨ Is August a good time to visit Decatur? – Ask the AI Weatherman
Temperatures
Rain 🌧️
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21
Dry days
10
Rainy days
0
Snow days
28°/18°
Temperatures
17 km/h
Avg max wind
76 %
Avg humidity
Decatur Weather August
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Temperatures trend during August in Decatur
See the weather trend as well as the moving average line
August weather in Decatur day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Thundery outbreaks possible | 26° /20° | 12.4 mm | 5 | |
| Aug. 2 |  Fog | 25° /17° | 0.6 mm | 7 | |
| Aug. 3 |  Overcast | 28° /16° | 0.2 mm | 8 | |
| Aug. 4 |  Light rain | 28° /18° | 3 mm | 8 | |
| Aug. 5 |  Patchy rain possible | 28° /19° | 1.6 mm | 8 | |
| Aug. 6 | Light rain | 28° /20° | 2.6 mm | 7 | |
| Aug. 7 | Patchy rain possible | 27° /18° | 0.5 mm | 7 | |
| Aug. 8 | Mist | 29° /19° | 0 mm | 8 | |
| Aug. 9 | Patchy rain possible | 28° /18° | 1.6 mm | 8 | |
| Aug. 10 |  Moderate rain | 28° /18° | 14.6 mm | 8 | |
| Aug. 11 | Light rain | 29° /19° | 6.5 mm | 8 | |
| Aug. 12 | Moderate rain | 26° /20° | 22 mm | 7 | |
| Aug. 13 | Moderate rain | 27° /18° | 13.4 mm | 7 | |
| Aug. 14 | Light rain | 28° /19° | 3.5 mm | 7 | |
| Aug. 15 | Moderate rain | 30° /19° | 11.8 mm | 7 | |
| Aug. 16 | Moderate rain | 31° /21° | 11.1 mm | 6 | |
| Aug. 17 | Patchy rain possible | 28° /20° | 1.3 mm | 6 | |
| Aug. 18 | Fog | 28° /18° | 0.9 mm | 8 | |
| Aug. 19 |  Heavy rain | 28° /19° | 52.8 mm | 5 | |
| Aug. 20 | Light rain | 26° /16° | 7.9 mm | 7 | |
| Aug. 21 |  Partly cloudy | 25° /14° | 0 mm | 7 | |
| Aug. 22 | Overcast | 26° /15° | 0.1 mm | 7 | |
| Aug. 23 | Partly cloudy | 28° /15° | 0 mm | 7 | |
| Aug. 24 | Partly cloudy | 27° /15° | 0 mm | 8 | |
| Aug. 25 | Light rain shower | 26° /14° | 1.5 mm | 6 | |
| Aug. 26 | Patchy rain possible | 30° /15° | 0.3 mm | 7 | |
| Aug. 27 |  Patchy light rain with thunder | 30° /17° | 0.5 mm | 7 | |
| Aug. 28 |  Sunny | 31° /17° | 0.2 mm | 8 | |
| Aug. 29 | Patchy rain possible | 30° /17° | 0.9 mm | 7 | |
| Aug. 30 | Light rain | 31° /17° | 2.9 mm | 7 | |
| Aug. 31 | Light rain shower | 29° /18° | 1.7 mm | 7 | |
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Important Notice
Our weather forecast for Decatur in August 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 August - FAQ
What are the expected maximum and minimum temperatures in Decatur during August?
During August, expect a variety of temperatures with highs around 28° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Decatur during August?
Significant rainfall exceeding 176.6 mm is expected in Decatur during August, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Decatur during August?
The average wind speed in Decatur during August is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Decatur
Explore the daily rainfall trends and prepare for Decaturs August weather 💧
Typically, Decatur has 10 rainy days in August with a total of 176.6 mm of rainfall.
UV exposure in Decatur during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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