August weather forecast
Marion, IL

In Marion, August continues the summer's warmth but hints at the coming fall season. The temperature remains considerably high, with an average high and low of 85.6°F (29.8°C) and 66.4°F (19.1°C) respectively. The month maintains a balance between high temperatures and relative humidity, presenting occasional muggy days. Even though August ends the summer, the city still receives a significant duration of sunshine. As August bids farewell to summer and welcomes September, expect a noticeable decrease in temperature and shorter daylight hours.

Temperature

Marion's weather in August indicates an average high-temperature of a warm 85.6°F (29.8°C), nearly consistent with the 87.4°F (30.8°C) of July. The mean low-temperature during August nights in Marion is a comfortable 66.4°F (19.1°C).

Heat index

During August, the heat index is calculated to be a sweltering 96.8°F (36°C). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

In Marion, Illinois, the average relative humidity in August is 76%.

Rainfall

In Marion, in August, during 13.5 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, there are 137.6 rainfall days, and 23.03" (585mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In Marion, the average length of the day in August is 13h and 34min.
On the first day of the month, sunrise is at 6:00 am and sunset at 8:04 pm. On the last day of August, in Marion, sunrise is at 6:25 am and sunset at 7:25 pm CDT.

Sunshine

In Marion, the average sunshine in August is 10.3h.

UV index

The months with the highest UV index in Marion are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high daily UV index of 6 during August translates into the following directions:
Guard against overexposure. Protection from sun-induced harm is essential. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.