August weather forecastPotomac, IL
August
Weather in August
The last month of the summer, August, is also a moderately hot month in Potomac, Illinois, with an average temperature fluctuating between 80.2°F (26.8°C) and 63°F (17.2°C).Temperature
Potomac experiences a subtle adjustment in high-temperatures to a still moderately hot 80.2°F (26.8°C) with the onset of August, maintaining near parity with July's 81.1°F (27.3°C). Throughout the month of August, the nighttime temperature dips to an average of 63°F (17.2°C).Humidity
In August, the average relative humidity in Potomac is 83%.Rainfall
In August, the rain falls for 14.3 days. Throughout August, 2.13" (54mm) of precipitation is accumulated. In Potomac, during the entire year, the rain falls for 146.3 days and collects up to 22.76" (578mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In Potomac, the average length of the day in August is 13h and 43min.On the first day of August in Potomac, sunrise is at 5:49 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 6:18 am and sunset at 7:24 pm CDT.
Sunshine
In Potomac, the average sunshine in August is 9.8h.UV index
The months with the highest UV index in Potomac are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes 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:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Potomac, IL
- Average high temperature in August: 80.2°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in August: 63°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in August
Potomac, IL
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in August
Potomac, IL
- Average wind speed in August: 6.3mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in August
Potomac, IL
- Average humidity in August: 83%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in August
Potomac, IL
- Average rainfall in August: 2.13"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in August
Potomac, IL
- Average rainfall days in August: 14.3 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is February (6.7 days).
Average snowfall in August
Potomac, IL
- Average snowfall in August: 0"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in August
Potomac, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (9.8 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
Potomac, IL
- Average daylight in August: 13h and 42min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in August: 9h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in August
Potomac, IL
- Average sunshine days in August: 12.1 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in August
Potomac, IL
- Average UV index in August: 6
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in August
Potomac, IL
- Average cloud cover in August: 33
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are June, August and September (Cloud cover 33).
Average visibility in August
Potomac, 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).
