August weather forecastMattoon, WI
August
Weather in August
August, the last month of the summer in Mattoon, is another warm month, with an average temperature fluctuating between 57.9°F (14.4°C) and 77.7°F (25.4°C).Temperature
A minor adjustment in Mattoon's average high-temperature is noted with the start of August, touching a still warm 77.7°F (25.4°C) from July's 79.3°F (26.3°C). In Mattoon, the average low-temperature during the month of August is a mild 57.9°F (14.4°C).Humidity
In August, the average relative humidity in Mattoon is 78%.Rainfall
In August, in Mattoon, the rain falls for 12.2 days. Throughout August, 1.54" (39mm) of precipitation is accumulated. In Mattoon, during the entire year, the rain falls for 126.9 days and collects up to 23.03" (585mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In August, the average length of the day is 14h and 1min.On the first day of the month, sunrise is at 5:42 am and sunset at 8:22 pm. On the last day of August, sunrise is at 6:17 am and sunset at 7:34 pm CDT.
Sunshine
The average sunshine in August in Mattoon is 9.8h.UV index
June through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The UV index of 5 in August translates into these instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Mattoon, WI
- Average high temperature in August: 77.7°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (22.3°F).
- Average low temperature in August: 57.9°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (11.5°F).
Average pressure in August
Mattoon, WI
- Average pressure in August: 29.95"Hg
The months with the highest atmospheric pressure are February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in August
Mattoon, WI
- Average wind speed in August: 6.7mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in August
Mattoon, WI
- Average humidity in August: 78%
The months with the highest relative humidity are January and February (88%).
The months with the lowest relative humidity are April and May (75%).
Average rainfall in August
Mattoon, WI
- Average rainfall in August: 1.54"
The wettest month (with the highest rainfall) is May (3.19").
The driest months (with the least rainfall) are January and February (1.02").
Average rainfall days in August
Mattoon, WI
- Average rainfall days in August: 12.2 days
The month with the highest number of rainy days is May (15.1 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in August
Mattoon, WI
- Average snowfall in August: 0"
The month with the highest snowfall is January (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Mattoon, WI
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (15.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Mattoon, WI
- Average daylight in August: 14h and 0min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in August: 9h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in August
Mattoon, WI
- Average sunshine days in August: 15.8 days
The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is April (12.7 days).
Average UV index in August
Mattoon, WI
- Average UV index in August: 5
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in August
Mattoon, WI
- Average cloud cover in August: 35
The months with the most cloud cover are January and February (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in August
Mattoon, WI
- Average visibility in August: 5mi
The months with the highest visibility are March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are January, February, August and September (5mi).
