Temperatures in July
It's warm in July in Illinois with an average temperature of 29°C. Temperatures this month range from a low of 27°C to a high of 31°C. At night, you can expect temperatures between 18°C and 21°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Illinois in July. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of July
The month of July starts in Illinois with hot temperatures, averaging around 30°C during the day and nights close to 20°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Since temperatures can differ between day and night, it’s a good idea to dress in layers.
Mid-July
By mid-July, the average daytime temperature stays the same at 30°C, with nights close to 21°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
End of July
By the end of July, the average daytime temperature in Illinois will be around 30°C, with nights close to 20°C. A shower might show up, but overall the weather will be dry and sunny.
As it gets cooler in the evening, it’s best to wear layers.
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Precipitation in July
In July, there is an average of 96 mm of precipitation, spread over 10 days. The wind speed is around 3 Bft, mostly coming from the South.
The average precipitation chance is 31% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in July for Illinois. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Illinois in July |
UK | ||
|---|---|---|---|
 Average Temperature |
29°C | 23°C | |
 High Temp |
31°C | 27°C | |
| Low Temp |
27°C | 21°C | |
 Total Precipitation |
96 mm | 52 mm | |
| Rainy Days |
10 days | 9 days | |
June
UV index
The UV index is a maximum of 3 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is July a good time to visit Illinois?
Want nice weather? Then July is a great time to be in Illinois. You’ll have pleasant temperatures and not too much rain this month.
Temperature records for Illinois in July
With 37°C, Illinois hit the highest temperature in the last 10 years in July 2022. The lowest daytime temperature in this month was 16°C in 2015. The extreme night temperatures ranged from a low of 12°C to a high of 26°C.
Check out the climate of Illinois for all months and discover the best travel time
The climate of Illinois is based on weather data from . Other spots, like New York City, Miami or Los Angeles, might have different weather. You can check out all destinations in Illinois for a full picture of the climate.
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Daily Temperature in July in Illinois
This chart shows the average daily temperatures, both day and night, for each day in July in Illinois, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in July in Illinois
The chart below shows the average daily precipitation in July for Illinois, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for July, you can expect around 10 days of rain in Illinois.
Daily UV Index in July in Illinois
This chart shows the average daily UV index in July in Illinois, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in July in Illinois Over the Years
This chart shows the average temperature in July in Illinois, measured in degrees Celsius, over the past years.
Total Precipitation in July in Illinois Over the Years
This chart shows the average precipitation in July in Illinois, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in July for Illinois
Click on a specific day in July for detailed info on the typical weather on that day in Illinois. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in July in Illinois
Have you been to Illinois in July?
Share your weather experience in July in Illinois.
Average Weather in Illinois by Month
Click on a month below to see detailed weather info for Illinois. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
