July weather forecast
St. Louis, MO

July is the warmest month of the year in St. Louis. High temperatures reach their zenith in this month, registering an all-year high of 71°F. Residents and tourists alike eagerly anticipate the quintessential southern summer, filled with sunny days and warm nights. The resurgence of humidity necessitates regular hydration. Yet, despite the humidity, July proves to be a popular month for outdoor concerts and music festivals in the city.

Temperature

In St. Louis, the average temperatures in July are the highest, with a peak at 89.1°F and a low of 71.1°F.

Heat index

Throughout July, the heat index is appraised at a very hot 102.2°F. Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In July, the average relative humidity in St. Louis is 68%.

Rainfall

In July, in St. Louis, the rain falls for 8.9 days. Throughout July, 4.09" of precipitation is accumulated. In St. Louis, during the entire year, the rain falls for 112.6 days and collects up to 40.94" of precipitation.

Snowfall

In St. Louis, snow does not fall in May through October.

Daylight

The average length of the day in July in St. Louis is 14h and 33min.
On the first day of July in St. Louis, sunrise is at 5:40 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 6:01 am and sunset at 8:12 pm CDT.

Sunshine

July has the most sunshine of the year in St. Louis, with an average of 10h of sunshine.

UV index

The months with the highest UV index in St. Louis are June through August, with an average maximum UV index of 9. A UV Index reading of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: A daily maximum UV index of 9 in July translates into the following instructions:
Immediate care is essential; skin and eyes can be harmed in no time without it. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Use liberally and reapply a broad-spectrum SPF 30+ sunscreen every two hours, or straight away after any outdoor workout or swim.