July weather forecast
Arlington Heights, IL

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Weather in July

Weighing in as the hottest month, July witnesses temperatures peaking at 81.1°F (27.3°C) in Arlington Heights. Corresponding to the rise in mercury, the UV index hits its annual high of 6. This period also registers the highest level of sunshine at 10.1 hours over a 14.9-hour long day. Despite being summer's zenith, trace amounts of rain are still observed with negligible wind speeds. The mildness of the wind and a dip in pressure underscore the hot and languid summer days.

Temperature

In Arlington Heights, temperatures reach their average annual highs in July, measuring 81.1°F (27.3°C) and a minimum average of 66°F (18.9°C).

Heat index

The heat index value during July is appraised at a tropical 86°F (30°C). If one continues to be active during exposure, it might cause tiredness and subsequent heat cramps.
Be aware that heat index ratings are designed for shaded locations and minor breezes. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', comes about by integrating the temperature readings with the humidity levels. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.

Humidity

The average relative humidity in July is 76%.

Rainfall

In Arlington Heights, Illinois, in July, it is raining for 14.5 days, with typically 2.4" (61mm) of accumulated precipitation. In Arlington Heights, during the entire year, the rain falls for 142.7 days and collects up to 27.91" (709mm) of precipitation.

Snowfall

In Arlington Heights, snow does not fall in June through September.

Daylight

The average length of the day in July in Arlington Heights is 14h and 53min.
On the first day of July in Arlington Heights, sunrise is at 5:20 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:11 pm CDT.

Sunshine

The months with the most sunshine in Arlington Heights, Illinois, are July and August, with an average of 10.1h of sunshine.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index in Arlington Heights. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the average person.
Note: The daily high UV index of 6 during July translates into the following recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
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 Arlington Heights?

The temperatures in Arlington Heights, Illinois, reach their highest averages in July, with highs of 81.1°F (27.3°C) and lows of 66°F (18.9°C).

What is the usual temperature for Arlington Heights in July?

Arlington Heights in July has an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 66°F (18.9°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in July is appraised at 86°F (30°C).

What is the average humidity in July in Arlington Heights?

The average relative humidity in July in Arlington Heights, Illinois, is 76%.

How much does it rain in Arlington Heights in July?

In Arlington Heights, in July, it is raining for 14.5 days, with typically 2.4" (61mm) of accumulated precipitation.

When it does not snow in Arlington Heights?

June through September are months without snowfall in Arlington Heights, Illinois.

What is the average length of the day in July in Arlington Heights?

In Arlington Heights, the average day length in July is 14h and 53min.

When is the sunrise / sunset in July in Arlington Heights?

On the first day of July, sunrise is at 5:20 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:11 pm CDT.

What is the month with the most sunshine in Arlington Heights?

The months with the most sunshine in Arlington Heights are July and August, with an average of 10.1h of sunshine.

How long on average sun shines in July in Arlington Heights?

In July, the average sunshine duration in Arlington Heights is 10.1h.

What are the months with the highest UV index in Arlington Heights?

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

What is the UV index reading in July in Arlington Heights?

The average daily maximum UV index in July is 6. A UV Index estimate of 6 to 7 represents a high health threat from unsafe 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
Arlington Heights, IL

Average temperature in July - Arlington Heights, IL
  • Average high temperature in July: 81.1°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in July: 66°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

Average pressure in July
Arlington Heights, IL

Average pressure in July - Arlington Heights, 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
Arlington Heights, IL

Average wind speed in July - Arlington Heights, IL
  • Average wind speed in July: 6.6mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

Average humidity in July
Arlington Heights, IL

Average humidity in July - Arlington Heights, IL
  • Average humidity in July: 76%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in July
Arlington Heights, IL

Average rainfall in July - Arlington Heights, IL
  • Average rainfall in July: 2.4"

The wettest months (with the highest rainfall) are April and May (3.46").
The driest month (with the least rainfall) is November (1.57").

Average rainfall days in July
Arlington Heights, IL

Average rainfall days in July - Arlington Heights, IL
  • Average rainfall days in July: 14.5 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is February (5.8 days).

Average snowfall in July
Arlington Heights, IL

Average snowfall in July - Arlington Heights, IL
  • Average snowfall in July: 0"

The month with the highest snowfall is February (5.71").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in July
Arlington Heights, IL

Average snowfall days in July - Arlington Heights, IL
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in July /
Average sunshine in July
Arlington Heights, IL

Average daylight in July / Average sunshine in July - Arlington Heights, 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 1min

The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in July
Arlington Heights, IL

Average sunshine days in July - Arlington Heights, IL
  • Average sunshine days in July: 14.6 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is February (10.3 days).

Average UV index in July
Arlington Heights, IL

Average UV index in July - Arlington Heights, 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
Arlington Heights, IL

Average cloud cover in July - Arlington Heights, IL
  • Average cloud cover in July: 30

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 30).

Average visibility in July
Arlington Heights, IL

Average visibility in July - Arlington Heights, IL
  • Average visibility in July: 6mi

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

Arlington Heights, Illinois, USA

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