Decatur (IL)
July
Weather in Decatur, Illinois for July 2025
Your guide to Decatur weather in July - trends and predictions
So far, July 2025 in Decatur shows a warmer trend than usual by 2.1 °F.
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 29.3 °F by the end of July.
The climate of Decatur in July is notably wet, with an average of 15 rainy days, and a total of 86.1 mm of precipitation.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
16
Dry days
15
Rainy days
0
Snow days
26°/17°
Temperatures
16 km/h
Avg max wind
82 %
Avg humidity
Decatur Weather July
Move between months or click on a day
Temperatures trend during July in Decatur
See the weather trend as well as the moving average line
July weather in Decatur day by day
Click on a date for more information
| 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 | Mist | 27° /17° | 0 mm | 0.6 | |
| Next | |||||
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.
Change Month
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 26° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Decatur during July?
Moderate rainfall is anticipated in Decatur during July, with a total of 86.1 mm spread over approximately 15 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Decatur during July?
The average wind speed in Decatur during July is 16 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 ☀️
Quick links
More Decatur weather pages
You are here
Where is Decatur?Get accurate weather forecasts for Decatur, located at latitude 39.84 and longitude -88.955. Stay updated with localized weather information tailored for Decatur.
Found a mistake?
We appreciate your attention to details. Tell us here.