July weather forecast
Marion, IL

July is the peak of summer in Marion, holding the record for the highest average temperatures of the year. The city witnesses the warmest conditions with average high temperatures achieving 87.4°F (30.8°C) and lows mildly reducing to 68.5°F (20.3°C). Despite the high temperatures, July competes with June in terms of maximum sunshine duration. The increase in humidity, paired with high temperatures, can cause muggy conditions. The progress towards August does not bring significant changes, but a slight dip in temperature with a reduced amount of sunlight can be witnessed.

Temperature

The month of July, characterized by an average high of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C), is recognized as the warmest.

Heat index

For most parts of July, the heat index is calculated to be a torrid 102.2°F (39°C). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

The average relative humidity in July is 77%.

Rainfall

In Marion, in July, it is raining for 15.3 days, with typically 2.09" (53mm) of accumulated precipitation. In Marion, during the entire year, the rain falls for 137.6 days and collects up to 23.03" (585mm) of precipitation.

Snowfall

In Marion, snow does not fall in May through September.

Daylight

In July, the average length of the day in Marion, Illinois, is 14h and 28min.
On the first day of July, sunrise is at 5:38 am and sunset at 8:21 pm. On the last day of the month, sunrise is at 5:59 am and sunset at 8:05 pm CDT.

Sunshine

The months with the most sunshine are June and July, with an average of 10.5h of sunshine.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Marion. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index, 6 during July, leads to the following recommendations:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. 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. Experience reduced UV exposure by about half when donning a wide-brim hat.