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
Saint Charles notes an average high-temperature of a still warm 79.5°F (26.4°C) in August, displaying minor variation from July. In the month of August, Saint Charles experiences an average low-temperature of 62.8°F (17.1°C).Humidity
The average relative humidity in August is 81%.Rainfall
In August, the rain falls for 10.6 days. Throughout August, 0.67" (17mm) of precipitation is accumulated. Throughout the year, there are 101.9 rainfall days, and 8.58" (218mm) of precipitation is accumulated.Snowfall
In Saint Charles, snow does not fall in May through September.Daylight
In August, the average length of the day is 13h and 49min.On the first day of the month, sunrise is at 5:47 am and sunset at 8:11 pm. On the last day of August, sunrise is at 6:18 am and sunset at 7:27 pm CDT.
Sunshine
In August, the average sunshine is 9.8h.UV index
The months with the highest UV index in Saint Charles are June through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 6 in August transforms into the following instructions:
Deflect overexposure. Sun protection is a necessity. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average August temperature in Saint Charles?
What is the average humidity in August in Saint Charles?
How much does it rain in Saint Charles in August?
When it does not snow in Saint Charles?
What is the average length of the day in August in Saint Charles?
What time are sunrise and sunset in August in Saint Charles?
How long on average sun shines in August in Saint Charles?
What is the month with the highest UV index in Saint Charles?
What is the UV index intensity in August in Saint Charles?
Average temperature in August
Saint Charles, IL
- Average high temperature in August: 79.5°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in August: 62.8°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in August
Saint Charles, IL
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in August
Saint Charles, IL
- Average wind speed in August: 6.1mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in August
Saint Charles, IL
- Average humidity in August: 81%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in August
Saint Charles, IL
- Average rainfall in August: 0.67"
The wettest month (with the highest rainfall) is May (1.26").
The driest months (with the least rainfall) are November and December (0.39").
Average rainfall days in August
Saint Charles, IL
- Average rainfall days in August: 10.6 days
The month with the highest number of rainy days is May (12.4 days).
The month with the least rainy days is January (3.4 days).
Average snowfall in August
Saint Charles, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (1.14").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Saint Charles, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Saint Charles, IL
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 9h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in August
Saint Charles, IL
- Average sunshine days in August: 16.4 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (13.3 days).
Average UV index in August
Saint Charles, 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 and December (UV index 1).
Average cloud cover in August
Saint Charles, IL
- Average cloud cover in August: 33
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in August
Saint Charles, IL
- Average visibility in August: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Saint Charles, Illinois, USA
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