July weather forecast
Blue Island, IL

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Weather in July

July, like June, in Blue Island, Illinois, is a moderately hot summer month, with temperature in the range of an average low of 66.6°F (19.2°C) and an average high of 81°F (27.2°C).

Temperature

July, on average, is the warmest month, registering a high temperature of 81°F (27.2°C) and a low of 66.6°F (19.2°C).

Heat index

For most parts of July, the heat index is computed to be a hot 86°F (30°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.

Humidity

The average relative humidity in July in Blue Island is 77%.

Rainfall

In Blue Island, Illinois, in July, during 18 rainfall days, 2.8" (71mm) of precipitation is typically accumulated. In Blue Island, during the entire year, the rain falls for 147.7 days and collects up to 23.62" (600mm) of precipitation.

Snowfall

In Blue Island, snow does not fall in May through September.

Daylight

In Blue Island, Illinois, the average length of the day in July is 14h and 50min.
On the first day of the month, sunrise is at 5:20 am and sunset at 8:28 pm. On the last day of July, sunrise is at 5:44 am and sunset at 8:09 pm CDT.

Sunshine

In July, the average sunshine in Blue Island is 10.3h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum daily UV index of 6 during July morphs into the following directions:
Guard against overexposure. Protection from sun-induced harm is essential. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the hottest in Blue Island?

During the warmest month in Blue Island, July, temperatures average a high of 81°F (27.2°C) and a low of 66.6°F (19.2°C).

What is the usual temperature for Blue Island in July?

The high-temperature, in July, in Blue Island, is 81°F (27.2°C), while the low-temperature averages to 66.6°F (19.2°C). In July, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, is computed to be 86°F (30°C).

What is the average humidity in July in Blue Island?

In Blue Island, the average relative humidity in July is 77%.

How many days does it rain in July in Blue Island?

In Blue Island, Illinois, in July, it is raining for 18 days, with typically 2.8" (71mm) of accumulated precipitation.

When it does not snow in Blue Island?

May through September are months without snowfall in Blue Island, Illinois.

What is the average length of the day in July in Blue Island?

In July, the average day length in Blue Island, Illinois, is 14h and 50min.

When are sunrise and sunset in July in Blue Island?

On the first day of July, sunrise is at 5:20 am and sunset at 8:28 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:09 pm CDT.

How long on average sun shines in July in Blue Island?

In Blue Island, Illinois, the average sunshine duration in July is 10.3h.

What are the months with the highest UV index in Blue Island?

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

What is the UV index reading in July in Blue Island?

The average daily maximum UV index in July in Blue Island, Illinois, is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Blue Island, IL

Average temperature in July - Blue Island, 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 (29.5°F).

  • Average low temperature in July: 66.6°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure in July
Blue Island, IL

Average pressure in July - Blue Island, IL
  • Average pressure in July: 29.97"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in July
Blue Island, IL

Average wind speed in July - Blue Island, IL
  • Average wind speed in July: 6.6mph

The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in July
Blue Island, IL

Average humidity in July - Blue Island, IL
  • Average humidity in July: 77%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).

Average rainfall in July
Blue Island, IL

Average rainfall in July - Blue Island, IL
  • Average rainfall in July: 2.8"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is December (1.02").

Average rainfall days in July
Blue Island, IL

Average rainfall days in July - Blue Island, IL
  • Average rainfall days in July: 18 days

The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is February (4.9 days).

Average snowfall in July
Blue Island, IL

Average snowfall in July - Blue Island, IL
  • Average snowfall in July: 0"

The month with the highest snowfall is February (3.07").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in July
Blue Island, IL

Average snowfall days in July - Blue Island, IL
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (11.8 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
Blue Island, IL

Average daylight in July / Average sunshine in July - Blue Island, IL
  • Average daylight in July: 14h and 5min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in July: 10h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in July
Blue Island, IL

Average sunshine days in July - Blue Island, IL
  • Average sunshine days in July: 9.8 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is July (9.8 days).

Average UV index in July
Blue Island, IL

Average UV index in July - Blue Island, 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 December (UV index 1).

Average cloud cover in July
Blue Island, IL

Average cloud cover in July - Blue Island, IL
  • Average cloud cover in July: 29

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in July
Blue Island, IL

Average visibility in July - Blue Island, IL
  • Average visibility in July: 6mi

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

Blue Island, Illinois, USA

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