July weather forecast
Chesterfield, MO

The height of summer hits its stride in July with Chesterfield experiencing the highest average temperature of 87.4°F (30.8°C). The weather compels locals and visitors alike to seek relief in the city's pools and nearby water bodies. Families take advantage of the summer school break to plan vacations and enjoy the city's outdoor amenities. Evenings offer a welcomed respite from the heat, often culminating in colorful sunsets. Amid the sweltering conditions, the intensity and beauty of summertime become evident.

Temperature

In Chesterfield, the highest average temperatures are observed in July, with a high of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C).

Heat index

The heat index in July is estimated at a very hot 102.2°F (39°C). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a single figure representing how weather conditions feel when combining 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. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

The average relative humidity in July in Chesterfield, Missouri, is 76%.

Rainfall

In July, in Chesterfield, the rain falls for 15.4 days. Throughout July, 2.64" (67mm) of precipitation is accumulated. Throughout the year, in Chesterfield, there are 139.6 rainfall days, and 26.1" (663mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Chesterfield.

Daylight

The average length of the day in July in Chesterfield is 14h and 34min.
On the first day of the month, sunrise is at 5:41 am and sunset at 8:30 pm. On the last day of July, sunrise is at 6:03 am and sunset at 8:13 pm CDT.

Sunshine

July has the most sunshine of the year in Chesterfield, with an average of 10.6h of sunshine.

UV index

In July, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: In July, the maximum UV index of 6 translates into these guidelines:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Enhance your sun protection with tightly woven, yet airy clothing.