Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
In August, Jacksonville's weather conditions record an average high-temperature of a still warm 82.6°F (28.1°C), demonstrating little divergence from the preceding month. In August, Jacksonville's temperature tends to fall to an average low of 64.8°F (18.2°C) during the night.Heat index
During August, the heat index is estimated at a hot 89.6°F (32°C). Persistently participating in activities during exposure may lead to fatigue and induce heat cramps.Consider that heat index readings are for situations in the shade and light wind. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Humidity
The average relative humidity in August is 80%.Rainfall
In Jacksonville, in August, it is raining for 13.5 days, with typically 2.4" (61mm) of accumulated precipitation. Throughout the year, there are 148.2 rainfall days, and 29.37" (746mm) of precipitation is accumulated.Snowfall
In Jacksonville, snow does not fall in May through September.Daylight
The average length of the day in August is 13h and 41min.On the first day of the month, sunrise is at 6:00 am and sunset at 8:13 pm. On the last day of August, sunrise is at 6:28 am and sunset at 7:33 pm CDT.
Sunshine
In Jacksonville, the average sunshine in August is 10h.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 6 in August interprets into the following advice:
Resist extreme sun exposure. Guarding against solar damage is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot in Jacksonville during August?
What is the average humidity in August?
How many days does it rain in August?
When it does not snow?
How many hours of daylight does Jacksonville have in August?
When is the sunrise / sunset in August?
How many hours of sunshine does Jacksonville have in August?
What are the months with the highest UV index?
What is the UV index reading in August?
Average temperature in August
Jacksonville, IL
- Average high temperature in August: 82.6°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in August: 64.8°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in August
Jacksonville, IL
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in August
Jacksonville, IL
- Average wind speed in August: 6.2mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).
Average humidity in August
Jacksonville, IL
- Average humidity in August: 80%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in August
Jacksonville, IL
- Average rainfall in August: 2.4"
The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.54").
Average rainfall days in August
Jacksonville, IL
- Average rainfall days in August: 13.5 days
The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and February (7.1 days).
Average snowfall in August
Jacksonville, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Jacksonville, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Jacksonville, IL
- Average daylight in August: 13h and 4min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in August: 10h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in August
Jacksonville, IL
- Average sunshine days in August: 15 days
The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in August
Jacksonville, IL
- Average UV index in August: 6
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in August
Jacksonville, IL
- Average cloud cover in August: 29
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility in August
Jacksonville, IL
- Average visibility in August: 5mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Jacksonville, Illinois, USA
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