July weather forecastDe Witt, IL

July

Weather in July

July, like June, in De Witt, Illinois, is a moderately hot summer month, with an average temperature varying between 81°F (27.2°C) and 64.9°F (18.3°C).

Temperature

In De Witt, Illinois, July is the month with the highest recorded average temperatures, measuring a high of 81°F (27.2°C) and a low of 64.9°F (18.3°C).

Heat index

The heat index for July is estimated at a hot 87.8°F (31°C). A sense of exhaustion might occur with extended exposure and activity, potentially causing heat cramps.
Consider that heat index readings are for situations in the shade and light wind. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.

Humidity

The most humid month is July, with an average relative humidity of 85%.

Rainfall

In De Witt, during July, the rain falls for 16.5 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, there are 138.7 rainfall days, and 20.91" (531mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in De Witt, Illinois.

Daylight

The average length of the day in July in De Witt, Illinois, is 14h and 42min.
On the first day of the month, sunrise is at 5:29 am and sunset at 8:28 pm. On the last day of July, in De Witt, sunrise is at 5:52 am and sunset at 8:10 pm CDT.

Sunshine

In De Witt, the average sunshine in July is 9.9h.

UV index

The months with the highest UV index in De Witt are June and July, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In July, an average UV index of 6 transforms into the following instructions:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.

Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In De Witt, Illinois, the average temperatures in July are the highest, with a peak at 81°F (27.2°C) and a low of 64.9°F (18.3°C).

During July, De Witt experiences an average high-temperature of 81°F (27.2°C) and a low-temperature of 64.9°F (18.3°C). In July, the average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, is estimated at 87.8°F (31°C).

The most humid month is July, with an average relative humidity of 85%.

In De Witt, the average relative humidity in July is 85%.

In De Witt, in July, during 16.5 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

May through October are months without snowfall in De Witt.

In De Witt, the average day length in July is 14h and 42min.

In July, on the first day of the month, sunrise is at 5:29 am and sunset at 8:28 pm. On the last day of the month, in De Witt, Illinois, sunrise is at 5:52 am and sunset at 8:10 pm CDT.

In July, the average sunshine duration in De Witt, Illinois, is 9.9h.

June and July, with an average maximum UV index of 6, are months with the highest UV index in De Witt.

In July, the average daily maximum UV index in De Witt is 6. A UV Index of 6 to 7 symbolizes a high health risk 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

79.9°F

81°F

80.2°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

8.3mph

7mph

6.9mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

15.4

16.5

13.7

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

11.3

14.3

Average UV index

Average cloud cover

Average visibility

Average temperature in July
De Witt, IL

Average high temperature in July: 81°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.5°F).

Average low temperature in July: 64.9°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).

Average pressure in July
De Witt, IL

Average pressure in July: 29.97"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in July
De Witt, IL

Average wind speed in July: 6.5mph

The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

Average humidity in July
De Witt, IL

Average humidity in July: 85%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).

Average rainfall in July
De Witt, IL

Average rainfall in July: 2.05"

The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is December (1.1").

Average rainfall days in July
De Witt, IL

Average rainfall days in July: 16.5 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is February (6.1 days).

Average snowfall in July
De Witt, IL

Average snowfall in July: 0"

The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in July
De Witt, IL

Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in July /
Average sunshine in July
De Witt, 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 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

Average sunshine days in July
De Witt, IL

Average sunshine days in July: 11 days

The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (10.4 days).

Average UV index in July
De Witt, IL

Average UV index in July: 6

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in July
De Witt, IL

Average cloud cover in July: 33

The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).

Average visibility in July
De Witt, 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).