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
The shift into August finds Dewey at an average high-temperature of a still moderately hot 80.2°F (26.8°C), closely comparable to July's conditions. An average temperature of 63.1°F (17.3°C) is recorded during the nights in August.Humidity
In August, the average relative humidity is 83%.Rainfall
In Dewey, during August, the rain falls for 11.3 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, in Dewey, there are 115.9 rainfall days, and 10.87" (276mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Dewey, the average length of the day in August is 13h and 43min.On the first day of the month, sunrise is at 5:51 am and sunset at 8:07 pm. On the last day of August, in Dewey, sunrise is at 6:20 am and sunset at 7:26 pm CDT.
Sunshine
In Dewey, Illinois, the average sunshine in August is 10h.UV index
The months with the highest UV index in Dewey are June 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 unsafe exposure to UV radiation for the ordinary person.Note: In August, a daily UV index of 6 turns into the following recommendations:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What are August temperatures in Dewey?
What is the average humidity in August in Dewey?
How much does it rain in Dewey in August?
When it does not snow in Dewey?
What is the average length of the day in August in Dewey?
When are sunrise and sunset in August in Dewey?
How many hours of sunshine does Dewey have in August?
When is the highest UV index in Dewey?
What is the UV index reading in August in Dewey?
Average temperature in August
Dewey, IL
- Average high temperature in August: 80.2°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in August: 63.1°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in August
Dewey, 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 (29.92"Hg).
Average wind speed in August
Dewey, IL
- Average wind speed in August: 6.4mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in August
Dewey, 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 (71%).
Average rainfall in August
Dewey, IL
- Average rainfall in August: 0.98"
The wettest month (with the highest rainfall) is May (1.46").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in August
Dewey, IL
- Average rainfall days in August: 11.3 days
The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in August
Dewey, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (1.3").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in August
Dewey, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in August /
Average sunshine in August
Dewey, IL
- Average daylight in August: 13h and 4min
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: 10h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in August
Dewey, IL
- Average sunshine days in August: 16.2 days
The month with the most sunshine days is November (21.4 days).
The month with the least sunshine days is July (12.3 days).
Average UV index in August
Dewey, 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
Dewey, IL
- Average cloud cover in August: 31
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in August
Dewey, 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).
Dewey, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location
