July weather forecast
Clayton, MO

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Weather in July

July is a tropical summer month in Clayton, Missouri, with an average temperature varying between 69.1°F (20.6°C) and 86.9°F (30.5°C).

Temperature

The highest temperatures are recorded in July, with averages reaching a high of 86.9°F (30.5°C) and a low of 69.1°F (20.6°C).

Heat index

For July, the heat index is computed to be a sweltering 100.4°F (38°C). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', arises from combining readings of air temperature and relative moisture content. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

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

Rainfall

In Clayton, during July, the rain falls for 16.7 days and regularly aggregates up to 3.19" (81mm) of precipitation. In Clayton, during the entire year, the rain falls for 144.8 days and collects up to 30.59" (777mm) of precipitation.

Snowfall

April through October are months without snowfall in Clayton.

Daylight

The average length of the day in July in Clayton is 14h and 33min.
On the first day of July in Clayton, Missouri, sunrise is at 5:40 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 6:02 am and sunset at 8:12 pm CDT.

Sunshine

June and July, with an average of 10.5h of sunshine, are months with the most sunshine in Clayton, Missouri.

UV index

The months with the highest UV index in Clayton are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.
Note: A maximum UV index of 6 in July translates into the following recommendations:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Resources | Updated: Feb 12, 2024 | Published by: Weather U.S.

Frequently asked questions

What time of the year is the hottest in Clayton?

July, with an average high of 86.9°F (30.5°C) and a low of 69.1°F (20.6°C), signifies the warmest month of the year.

How hot does it get in Clayton in July?

The high-temperature, in July, in Clayton, records 86.9°F (30.5°C), while the low-temperature is 69.1°F (20.6°C). In July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, is computed to be 100.4°F (38°C).

What is the average humidity in July in Clayton?

In July, the average relative humidity in Clayton, Missouri, is 76%.

How much does it rain in Clayton in July?

In Clayton, in July, it is raining for 16.7 days, with typically 3.19" (81mm) of accumulated precipitation.

When it does not snow in Clayton?

In Clayton, snow does not fall in April through October.

How many hours of daylight does Clayton have in July?

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

When are sunrise and sunset in July in Clayton?

On the first day of July in Clayton, sunrise is at 5:40 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 6:02 am and sunset at 8:12 pm CDT.

What are the months with the most sunshine in Clayton?

The months with the most sunshine are June and July, with an average of 10.5h of sunshine.

How long on average sun shines in July in Clayton?

In Clayton, the average sunshine duration in July is 10.5h.

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

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 Clayton?

In July, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unprotected exposure to 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
Clayton, MO

Average temperature in July - Clayton, MO
  • Average high temperature in July: 86.9°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in July: 69.1°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in July
Clayton, MO

Average pressure in July - Clayton, MO
  • 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
Clayton, MO

Average wind speed in July - Clayton, MO
  • Average wind speed in July: 5.5mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in July
Clayton, MO

Average humidity in July - Clayton, MO
  • Average humidity in July: 76%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in July
Clayton, MO

Average rainfall in July - Clayton, MO
  • Average rainfall in July: 3.19"

The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is February (1.69").

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Average rainfall days in July
Clayton, MO

Average rainfall days in July - Clayton, MO
  • Average rainfall days in July: 16.7 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.5 days).

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Average snowfall in July
Clayton, MO

Average snowfall in July - Clayton, MO
  • Average snowfall in July: 0"

The month with the highest snowfall is February (2.6").
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
Clayton, MO

Average snowfall days in July - Clayton, MO
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

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Average daylight in July /
Average sunshine in July
Clayton, MO

Average daylight in July / Average sunshine in July - Clayton, MO
  • Average daylight in July: 14h and 4min

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 3min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average sunshine days in July
Clayton, MO

Average sunshine days in July - Clayton, MO
  • Average sunshine days in July: 11.5 days

The month with the most sunshine days is January (21 days).
The month with the least sunshine days is June (11.2 days).

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Average UV index in July
Clayton, MO

Average UV index in July - Clayton, MO
  • 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
Clayton, MO

Average cloud cover in July - Clayton, MO
  • Average cloud cover in July: 28

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in July
Clayton, MO

Average visibility in July - Clayton, MO
  • 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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Clayton, Missouri, USA

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