Decatur (IL)
July
Weather in Decatur, Illinois for July 2026
Your guide to Decatur weather in July - trends and predictions
In general, the average temperature in Decatur at the beginning of July is 28.3 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 29.6 °F by the end of July.
Decatur experiences heavy rainfall in July, with over 20 rainy days and an average total precipitation 275.5 mm.
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Temperatures
Rain 🌧️
More
8
Dry days
23
Rainy days
0
Snow days
28°/19°
Temperatures
15 km/h
Avg max wind
82 %
Avg humidity
Decatur Weather July
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Temperatures trend during July in Decatur
See the weather trend as well as the moving average line
July weather in Decatur day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jul. 1 |  Overcast | 25° /13° | 2 mm | 6 | |
| Jul. 2 |  Sunny | 29° /16° | 0 mm | 7 | |
| Jul. 3 |  Light rain shower | 30° /19° | 5.4 mm | 7 | |
| Jul. 4 | Light rain shower | 30° /21° | 3 mm | 7 | |
| Jul. 5 | Light rain shower | 29° /20° | 1.5 mm | 7 | |
| Jul. 6 |  Fog | 26° /18° | 13.1 mm | 6 | |
| Jul. 7 | Sunny | 29° /19° | 12.9 mm | 7 | |
| Jul. 8 | Light rain shower | 29° /18° | 6.3 mm | 7 | |
| Jul. 9 | Light rain shower | 24° /20° | 128 mm | 6 | |
| Jul. 10 | Fog | 28° /18° | 0.9 mm | 7 | |
| Jul. 11 | Patchy rain possible | 30° /19° | 0.6 mm | 7 | |
| Jul. 12 | Patchy rain possible | 30° /20° | 0.2 mm | 7 | |
| Jul. 13 |  Moderate or heavy rain with thunder | 28° /20° | 19.6 mm | 6 | |
| Jul. 14 |  Thundery outbreaks possible | 30° /21° | 0 mm | 7 | |
| Jul. 15 | Overcast | 30° /21° | 1.8 mm | 7 | |
| Jul. 16 |  Patchy light rain with thunder | 29° /22° | 1.9 mm | 7 | |
| Jul. 17 | Fog | 26° /19° | 1.2 mm | 6 | |
| Jul. 18 | Patchy rain possible | 25° /16° | 1.8 mm | 6 | |
| Jul. 19 | Patchy rain possible | 29° /16° | 0 mm | 6 | |
| Jul. 20 | Patchy rain possible | 27° /18° | 3.2 mm | 6 | |
| Jul. 21 | Patchy rain possible | 28° /20° | 29.4 mm | 6 | |
| Jul. 22 | Patchy rain possible | 29° /17° | 0.3 mm | 7 | |
| Jul. 23 | Light rain shower | 29° /19° | 1.6 mm | 7 | |
| Jul. 24 | Light rain shower | 30° /20° | 5 mm | 7 | |
| Jul. 25 | Fog | 28° /21° | 3.8 mm | 7 | |
| Jul. 26 | Mist | 28° /18° | 3.5 mm | 7 | |
| Jul. 27 | Patchy rain possible | 29° /20° | 20.1 mm | 7 | |
| Jul. 28 | Light rain shower | 29° /22° | 4.1 mm | 7 | |
| Jul. 29 | Light rain shower | 32° /22° | 2.8 mm | 7 | |
| Jul. 30 | Sunny | 32° /22° | 0.4 mm | 8 | |
| Jul. 31 | Patchy light rain with thunder | 29° /19° | 1.2 mm | 7 | |
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Important Notice
Our weather forecast for Decatur in July 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 July - FAQ
What are the expected maximum and minimum temperatures in Decatur during July?
During July, expect a variety of temperatures with highs around 28° and lows near 19°, suitable for diverse activities and preferences.
How much rainfall should be expected in Decatur during July?
Significant rainfall exceeding 275.5 mm is expected in Decatur during July, occurring over more than 23 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Decatur during July?
The average wind speed in Decatur during July is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
July rainfall patterns in Decatur
Explore the daily rainfall trends and prepare for Decaturs July weather 💧
UV exposure in Decatur during July
Stay informed about UV levels for safe outdoor activities throughout the month of July ☀️
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