July weather forecast
Centreville, IL

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Weather in July

July is a hot summer month in Centreville, Illinois, with an average temperature varying between 68.5°F (20.3°C) and 86.4°F (30.2°C).

Temperature

Centreville's temperatures tend to reach their peak averages in July, with a high of 86.4°F (30.2°C) and a low of 68.5°F (20.3°C).

Heat index

The heat index value during July is evaluated at a fiery hot 100.4°F (38°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', gives a temperature feeling by integrating air temperature and humidity. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. 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.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The months with the highest humidity in Centreville are May and July, with an average relative humidity of 78%.

Rainfall

In Centreville, in July, it is raining for 17.3 days, with typically 3.43" (87mm) of accumulated precipitation. Throughout the year, in Centreville, there are 152.2 rainfall days, and 36.46" (926mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Centreville.

Daylight

In July, the average length of the day in Centreville is 14h and 33min.
On the first day of the month, sunrise is at 5:40 am and sunset at 8:28 pm. On the last day of July, sunrise is at 6:02 am and sunset at 8:11 pm CDT.

Sunshine

The months with the most sunshine are June and July, with an average of 10.4h of sunshine.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.
Note: In July, a daily maximum UV index of 6 leads to the following instructions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
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Frequently asked questions

What are the warmest months in Centreville?

The month of July sees the average highest temperatures in Centreville, Illinois, reaching 86.4°F (30.2°C) at the peak and 68.5°F (20.3°C) at the low.

How hot is July in Centreville?

Centreville in July has an average high-temperature of 86.4°F (30.2°C) and an average low-temperature of 68.5°F (20.3°C). In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is evaluated at 100.4°F (38°C).

What is the most humid month in Centreville?

May and July, with an average relative humidity of 78%, are most humid months in Centreville, Illinois.

What is the average humidity in July in Centreville?

In July, the average relative humidity in Centreville is 78%.

How many days does it rain in July in Centreville?

In Centreville, during July, the rain falls for 17.3 days and regularly aggregates up to 3.43" (87mm) of precipitation.

When it does not snow in Centreville?

April through October are months without snowfall in Centreville.

How many hours of daylight does Centreville have in July?

In July, the average day length is 14h and 33min.

When is the sunrise / sunset in July in Centreville?

On the first day of July in Centreville, sunrise is at 5:40 am and sunset at 8:28 pm. On the last day of the month, sunrise is at 6:02 am and sunset at 8:11 pm CDT.

What is the month with the most sunshine in Centreville?

The months with the most sunshine are June and July, with an average of 10.4h of sunshine.

How long on average sun shines in July in Centreville?

In July, the average sunshine duration is 10.4h.

What are the months with the highest UV index in Centreville?

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

How high is the UV index in July in Centreville?

The average daily maximum UV index in July in Centreville is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation.
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
Centreville, IL

Average temperature in July - Centreville, IL
  • Average high temperature in July: 86.4°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in July: 68.5°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).

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Average pressure in July
Centreville, IL

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

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in July
Centreville, IL

Average wind speed in July - Centreville, IL
  • Average wind speed in July: 5.5mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).

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Average humidity in July
Centreville, IL

Average humidity in July - Centreville, IL
  • Average humidity in July: 78%

The months with the highest relative humidity are May and July (78%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in July
Centreville, IL

Average rainfall in July - Centreville, IL
  • Average rainfall in July: 3.43"

The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is February (2.01").

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Average rainfall days in July
Centreville, IL

Average rainfall days in July - Centreville, IL
  • Average rainfall days in July: 17.3 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.7 days).

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Average snowfall in July
Centreville, IL

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

The month with the highest snowfall is February (2.44").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in July
Centreville, IL

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

The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in July / Average sunshine in July - Centreville, IL
  • Average daylight in July: 14h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in July: 10h and 2min

The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average sunshine days in July
Centreville, IL

Average sunshine days in July - Centreville, IL
  • Average sunshine days in July: 11.4 days

The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is May (10.7 days).

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Average UV index in July
Centreville, IL

Average UV index in July - Centreville, IL
  • Average UV index in July: 6

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

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Average cloud cover in July
Centreville, IL

Average cloud cover in July - Centreville, IL
  • Average cloud cover in July: 29

The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in July
Centreville, IL

Average visibility in July - Centreville, 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).

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Centreville, Illinois, USA

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