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United StatesThe weather in July in Illinois
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.
Looking for great weather? July is a good time to be in Illinois. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in July for Illinois, United States. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 37°C in 2022, Illinois reached the highest temperature in July over the past 10 years. The lowest daytime temperature in this month was 16°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of 12°C to a highest value of 26°C.
Rainfall amount
In July, there is an average of 96 mm of precipitation, spread over 13 days. The wind speed is around 3 Bft, mostly coming from the South.
Daily weather in July for Illinois
Click on any day in July to get detailed info about the usual weather on that day in Illinois. Check out the historical temperatures and precipitation over the past 10 years on this day.
July weather comparison
| Illinois | New York | |
|---|---|---|
| Average temperature | 29°C | 31°C |
| Max. temperature | 31°C | 33°C |
| Min. temperature | 18°C | -5°C |
| Total precipitation | 96 mm | 160 mm |
| Rainy days | 13 days | 18 days |
Start of July
The month of July starts in Illinois with hot temps, averaging around 30°C during the day and nights around 20°C.
Mid July
By mid-July, daytime temps stay steady at around 30°C, with nights around 21°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of July
By the end of July, the average daytime temperature in Illinois is around 30°C, while nighttime temps are about 20°C. A shower might pop up, but overall, the weather will be dry and sunny.
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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.
Check out the climate of Illinois for all months and discover the best travel time
The climate in Illinois is based on weather data from . Other places, like New York City, Miami or Los Angeles, might have different weather. You can check out all destinations in Illinois to get the full picture of the climate.
Temperature charts
These charts show the average temperatures in July in Illinois, United States. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in July in Illinois
Temperature in July in Illinois over the years
Precipitation charts
These charts show the average amount of precipitation in July in Illinois, United States. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in July in Illinois
Total precipitation in July in Illinois over the years
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.
Weather experiences in July in Illinois
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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.