July weather forecastMarion, IL
July
Weather in July
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
Temperature readings reach their annual highs in July, averaging 87.4°F (30.8°C) and a minimum average of 68.5°F (20.3°C).Heat index
In July, the heat index is estimated at a fiery hot 102.2°F (39°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.Be aware that heat index ratings are designed for shaded locations and minor breezes. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', shows a temperature sensation when both heat and moisture conditions are combined. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. 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 remain especially vital for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. The body is at risk of dehydration and related complications when it fails to shed excessive heat.
Humidity
In Marion, the average relative humidity in July is 77%.Rainfall
In July, the rain falls for 15.3 days. Throughout July, 2.09" (53mm) of precipitation is 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 July is 14h and 28min.On the first day of the month, sunrise is at 5:38 am and sunset at 8:21 pm. On the last day of July, 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
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In July, a daily UV index of 6 turns into the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Marion, IL
- Average high temperature in July: 87.4°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).
- Average low temperature in July: 68.5°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in July
Marion, IL
- Average pressure in July: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in July
Marion, IL
- Average wind speed in July: 5.8mph
The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in July
Marion, IL
- Average humidity in July: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in July
Marion, IL
- Average rainfall in July: 2.09"
The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.1").
Average rainfall days in July
Marion, IL
- Average rainfall days in July: 15.3 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.8 days).
Average snowfall in July
Marion, IL
- Average snowfall in July: 0"
The months with the highest snowfall are January and February (0.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in July
Marion, IL
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in July /
Average sunshine in July
Marion, IL
- Average daylight in July: 14h and 30min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in July: 10h and 30min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in July
Marion, IL
- Average sunshine days in July: 12.9 days
The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in July
Marion, IL
- Average UV index in July: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in July
Marion, IL
- Average cloud cover in July: 29
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are June, August and September (Cloud cover 28).
Average visibility in July
Marion, IL
- Average visibility in July: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
