July weather forecast
Westmont, IL

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Weather in July

July, like June, in Westmont, Illinois, is a moderately hot summer month, with an average temperature ranging between min 66.4°F (19.1°C) and max 82.4°F (28°C).

Temperature

The month of July sees the highest average temperatures, reaching 82.4°F (28°C) at the peak and 66.4°F (19.1°C) at the low.

Heat index

During July, the heat index is computed to be a tropical 89.6°F (32°C). Ongoing activity coupled with exposure often results in weariness and could induce heat cramps.
Heat index readings emphasize conditions of light breezes and shaded spots. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.

Humidity

In July, the average relative humidity is 76%.

Rainfall

In Westmont, in July, during 14.6 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. In Westmont, during the entire year, the rain falls for 118.5 days and collects up to 13.74" (349mm) of precipitation.

Snowfall

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

Daylight

In Westmont, the average length of the day in July is 14h and 52min.
On the first day of the month, sunrise is at 5:21 am and sunset at 8:30 pm. On the last day of July, in Westmont, sunrise is at 5:45 am and sunset at 8:10 pm CDT.

Sunshine

In July, the average sunshine 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 of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In July, the maximum UV index of 6 suggests this advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. 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 minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Updated: Aug 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the hottest time of year?

July stands out as Westmont's warmest month, with an average high-temperature of 82.4°F (28°C) and a low-temperature of 66.4°F (19.1°C).

How hot does it get in July?

In July, in Westmont, the average high-temperature is 82.4°F (28°C), and the average low-temperature is 66.4°F (19.1°C). In July, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is computed to be 89.6°F (32°C).

What is the average humidity in July in Westmont?

The average relative humidity in July in Westmont is 76%.

How many days does it rain in July?

In Westmont, in July, it is raining for 14.6 days, with typically 1.61" (41mm) of accumulated precipitation.

When it does not snow?

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

How many hours of daylight does Westmont have in July?

In Westmont, the average day length in July is 14h and 52min.

When is the sunrise / sunset in July?

In July, on the first day of the month, sunrise is at 5:21 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 8:10 pm CDT.

How many hours of sunshine does Westmont have in July?

In July, the average sunshine duration is 9.9h.

What are the months with the highest UV index?

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

How high is the UV index in July?

In July, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health threat 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
Westmont, IL

Average temperature in July - Westmont, IL
  • Average high temperature in July: 82.4°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in July: 66.4°F

The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

Average pressure in July
Westmont, IL

Average pressure in July - Westmont, 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
Westmont, IL

Average wind speed in July - Westmont, IL
  • Average wind speed in July: 6.3mph

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

Average humidity in July
Westmont, IL

Average humidity in July - Westmont, 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 (72%).

Average rainfall in July
Westmont, IL

Average rainfall in July - Westmont, IL
  • Average rainfall in July: 1.61"

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is December (0.63").

Average rainfall days in July
Westmont, IL

Average rainfall days in July - Westmont, IL
  • Average rainfall days in July: 14.6 days

The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (4.2 days).

Average snowfall in July
Westmont, IL

Average snowfall in July - Westmont, IL
  • Average snowfall in July: 0"

The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in July
Westmont, IL

Average snowfall days in July - Westmont, IL
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in July / Average sunshine in July - Westmont, 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: 9h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in July
Westmont, IL

Average sunshine days in July - Westmont, IL
  • Average sunshine days in July: 11.8 days

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (11.8 days).

Average UV index in July
Westmont, IL

Average UV index in July - Westmont, 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
Westmont, IL

Average cloud cover in July - Westmont, IL
  • Average cloud cover in July: 32

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).

Average visibility in July
Westmont, IL

Average visibility in July - Westmont, 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).

Westmont, Illinois, USA

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