August weather forecast
Chesterfield, MO

After the peak of July, August continues to carry forward the chorus of summer, albeit with slightly less intensity. It remains primarily hot in the city with a temperature transition from the high of July to a slightly milder 86.2°F (30.1°C). The city gears up to get back to routine as summer vacations come to a close and school bells begin to signal the upcoming academic year. Despite the ongoing heat, the anticipation of autumn’s arrival subtly starts to surface. With the end of summer on the horizon, the residents of Chesterfield maximize their moments under the summer sun.

Temperature

The arrival of August in Chesterfield is marked by an average high-temperature of a still tropical 86.2°F (30.1°C), bearing a close resemblance to July. In Chesterfield, an average nighttime temperature of 66.9°F (19.4°C) is expected during August.

Heat index

August's mean heat index is appraised at a sweltering 96.8°F (36°C). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Keep in mind the heat index values are meant for areas in shade and with light wind. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

In August, the average relative humidity in Chesterfield is 74%.

Rainfall

In Chesterfield, in August, it is raining for 14.5 days, with typically 2.99" (76mm) of accumulated precipitation. Throughout the year, there are 139.6 rainfall days, and 26.1" (663mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In Chesterfield, the average length of the day in August is 13h and 38min.
On the first day of August, sunrise is at 6:04 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 7:33 pm CDT.

Sunshine

The average sunshine in August is 10.3h.

UV index

The average daily maximum UV index in August in Chesterfield is 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In August, an average UV index of 6 transforms into the following instructions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Enhance your sun protection with tightly woven, yet airy clothing.