July weather forecast
Harrisburg, IL

In Harrisburg, Illinois, July stands out as the warmest month, with temperatures soaring from 68.5°F (20.3°C) up to 87.3°F (30.7°C). The city epitomizes the height of Summer during this phase, with several sunny, hot days. Considering the substantial rise in temperatures, locals and visitors alike are drawn towards water-based activities for respite from the heat. The month receives little rainfall, maintaining the overall dry and hot climate. The concluding days of July signal a gradual decrease in temperature, ushering the upcoming months.

Temperature

July stands out as Harrisburg's warmest month, with temperatures ranging between an average high of 87.3°F (30.7°C) and a low of 68.5°F (20.3°C).

Heat index

In July, the average heat index is evaluated at a torrid 102.2°F (39°C). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Understanding the heat index involves considering values for shaded locales with light wind. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', embodies the combination of air temperature and moisture content to illustrate perceived heat. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

In Harrisburg, Illinois, the average relative humidity in July is 77%.

Rainfall

In Harrisburg, in July, it is raining for 17.1 days, with typically 2.87" (73mm) of accumulated precipitation. Throughout the year, in Harrisburg, there are 158.6 rainfall days, and 36.02" (915mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Harrisburg.

Daylight

In July, the average length of the day is 14h and 28min.
On the first day of July in Harrisburg, sunrise is at 5:36 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 5:57 am and sunset at 8:03 pm CDT.

Sunshine

The average sunshine in July is 10.5h.

UV index

The months with the highest UV index in Harrisburg are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index, 6 in July, converts into the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.