July weather forecast
Affton, MO

July is typically the hottest month in Affton, Missouri, with average temperatures peaking at 86.9°F (30.5°C). There’s a certain intensity that comes with July, making it critical to find effective ways to beat the heat. Whether it's ice-cold lemonade, swaying on a porch swing, or sitting by a pool, the month invites relaxation. The longer daylight hours allow for multiple activities before the night's serenity kicks in. It's a month of full-fledged summer energy where the heat dictates the rhythms of daily life.

Temperature

The month of July sees the highest average temperatures in Affton, reaching 86.9°F (30.5°C) at the peak and 69.3°F (20.7°C) at the low.

Heat index

During July, the heat index is calculated to be a fiery hot 100.4°F (38°C). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Heat index determinations are made taking into account the shade and light air movements. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

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

Rainfall

In Affton, in July, during 16.9 rainfall days, 3.27" (83mm) of precipitation is typically accumulated. Throughout the year, in Affton, there are 146.1 rainfall days, and 32.36" (822mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In July, the average length of the day in Affton, Missouri, is 14h and 32min.
On the first day of July, sunrise is at 5:41 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

The average sunshine in July is 10.3h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Affton. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.
Note: An average maximum UV index of 6 in July leads to these recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. 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-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.