July weather forecastJacksonville, IL

July

Weather in July

July, the same as June, is another warm summer month in Jacksonville, Illinois, with an average temperature fluctuating between 83.3°F (28.5°C) and 66.7°F (19.3°C).

Temperature

In Jacksonville, the month of July registers the highest temperatures, averaging 83.3°F (28.5°C) at the peak and 66.7°F (19.3°C) at the lowest.

Heat index

Throughout July, the heat index is estimated at a hot 93.2°F (34°C). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'felt air temperature' or 'real feel', determines the feeling of heat when you account for the relative humidity. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.

Humidity

With an average relative humidity of 83%, July is the most humid month.

Rainfall

In Jacksonville, during July, the rain falls for 15.8 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, in Jacksonville, there are 148.2 rainfall days, and 29.37" (746mm) of precipitation is accumulated.

Snowfall

In Jacksonville, snow does not fall in May through September.

Daylight

In July, the average length of the day is 14h and 39min.
On the first day of July, sunrise is at 5:37 am and sunset at 8:32 pm. On the last day of the month, sunrise is at 5:59 am and sunset at 8:14 pm CDT.

Sunshine

The average sunshine in July is 10.2h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 6 in July interprets into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.

Updated: Jun 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

With average high and low temperatures of 83.3°F (28.5°C) and 66.7°F (19.3°C) respectively, July is Jacksonville's warmest month.

The average high-temperature, in July, in Jacksonville, is 83.3°F (28.5°C), while the average low-temperature is 66.7°F (19.3°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in July is estimated at 93.2°F (34°C).

The most humid month is July, with an average relative humidity of 83%.

In Jacksonville, the average relative humidity in July is 83%.

In Jacksonville, in July, it is raining for 15.8 days, with typically 2.28" (58mm) of accumulated precipitation.

May through September are months without snowfall.

In July, the average day length is 14h and 39min.

In July, on the first day of the month, sunrise is at 5:37 am and sunset at 8:32 pm. On the last day of the month, sunrise is at 5:59 am and sunset at 8:14 pm CDT.

In July, the average sunshine duration is 10.2h.

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

In July, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

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

Jun

July

Aug

Average high temperature

81.5°F

83.3°F

82.6°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.8mph

6.5mph

6.6mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

15.8

13.5

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

10.5

12.3

Average UV index

Average cloud cover

29%

Average visibility

6mi

5mi

Average temperature in July
Jacksonville, IL

Average high temperature in July: 83.3°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.4°F).

Average low temperature in July: 66.7°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21°F).

Average pressure in July
Jacksonville, 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 (29.91"Hg).

Average wind speed in July
Jacksonville, IL

Average wind speed in July: 6.1mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).

Average humidity in July
Jacksonville, IL

Average humidity in July: 83%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

Average rainfall in July
Jacksonville, IL

Average rainfall in July: 2.28"

The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.54").

Average rainfall days in July
Jacksonville, IL

Average rainfall days in July: 15.8 days

The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and February (7.1 days).

Average snowfall in July
Jacksonville, IL

Average snowfall in July: 0"

The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in July
Jacksonville, 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
Jacksonville, IL

Average daylight in July: 14h and 42min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

Average sunshine in July: 10h and 12min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in July
Jacksonville, IL

Average sunshine days in July: 12.3 days

The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in July
Jacksonville, IL

Average UV index in July: 6

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

Average cloud cover in July
Jacksonville, IL

Average cloud cover in July: 29

The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).

Average visibility in July
Jacksonville, 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).