July weather forecastIlliopolis, IL

July

Weather in July

July, the same as June, is another warm summer month in Illiopolis, Illinois, with temperature in the range of an average low of 65.7°F (18.7°C) and an average high of 82°F (27.8°C).

Temperature

The month of July sees the highest average temperatures, reaching 82°F (27.8°C) at the peak and 65.7°F (18.7°C) at the low.

Heat index

The heat index in July is computed to be a tropical 89.6°F (32°C). If exposure and activity persist, fatigue could ensue, possibly leading to heat cramps.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.

Humidity

The most humid month is July, with an average relative humidity of 84%.

Rainfall

In Illiopolis, Illinois, in July, it is raining for 16.3 days, with typically 2.05" (52mm) of accumulated precipitation. Throughout the year, there are 141.8 rainfall days, and 22.24" (565mm) of precipitation is accumulated.

Snowfall

In Illiopolis, snow does not fall in May through October.

Daylight

The average length of the day in July is 14h and 40min.
On the first day of the month, sunrise is at 5:32 am and sunset at 8:29 pm. On the last day of July, in Illiopolis, sunrise is at 5:55 am and sunset at 8:11 pm CDT.

Sunshine

In Illiopolis, the average sunshine in July is 9.9h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 6 during July leads to these advisories:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.

Updated: Jun 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Illiopolis's warmest weather arrives in July, when temperatures average a high of 82°F (27.8°C) and a low of 65.7°F (18.7°C).

The average high-temperature, in July, in Illiopolis, is 82°F (27.8°C), while the average low-temperature is 65.7°F (18.7°C). In July, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, is computed to be 89.6°F (32°C).

With an average relative humidity of 84%, July is the most humid month.

In July, the average relative humidity is 84%.

In Illiopolis, in July, during 16.3 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

May through October are months without snowfall.

In July, the average day length is 14h and 40min.

On the first day of July, sunrise is at 5:32 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:55 am and sunset at 8:11 pm CDT.

In July, the average sunshine duration in Illiopolis is 9.9h.

The months with the highest UV index are June through August, with an average maximum UV index of 6.

The average daily maximum UV index in July is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J July A S O N D

Jun

July

Aug

Average high temperature

80.6°F

82°F

81.3°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

8.1mph

6.8mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

15.8

16.3

14.3

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

11.8

10.9

13.1

Average UV index

Average cloud cover

Average visibility

Average temperature in July
Illiopolis, IL

Average high temperature in July: 82°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.5°F).

Average low temperature in July: 65.7°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

Average pressure in July
Illiopolis, IL

Average pressure in July: 29.97"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in July
Illiopolis, IL

Average wind speed in July: 6.3mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

Average humidity in July
Illiopolis, IL

Average humidity in July: 84%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).

Average rainfall in July
Illiopolis, IL

Average rainfall in July: 2.05"

The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is December (1.1").

Average rainfall days in July
Illiopolis, IL

Average rainfall days in July: 16.3 days

The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and February (6.3 days).

Average snowfall in July
Illiopolis, IL

Average snowfall in July: 0"

The month with the highest snowfall is January (2.24").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in July
Illiopolis, IL

Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (9.4 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in July /
Average sunshine in July
Illiopolis, IL

Average daylight in July: 14h and 42min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

Average sunshine in July: 9h and 54min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

Average sunshine days in July
Illiopolis, IL

Average sunshine days in July: 10.9 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (10.8 days).

Average UV index in July
Illiopolis, IL

Average UV index in July: 6

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in July
Illiopolis, IL

Average cloud cover in July: 32

The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are June and September (Cloud cover 31).

Average visibility in July
Illiopolis, IL

Average visibility in July: 5mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).