August weather forecastMerna, IL
August
Weather in August
August, the last month of the summer in Merna, is another warm month, with an average temperature fluctuating between 79.9°F (26.6°C) and 63.1°F (17.3°C).Temperature
Merna's weather in August displays an average high-temperature of a still moderately hot 79.9°F (26.6°C), showing minor disparity from July's 80.8°F (27.1°C). Merna experiences a steady low-temperature of 63.1°F (17.3°C) throughout August.Humidity
In August, the average relative humidity in Merna is 83%.Rainfall
In Merna, Illinois, in August, it is raining for 15.9 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 163.1 rainfall days, and 33.62" (854mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in Merna.Daylight
The average length of the day in August in Merna is 13h and 44min.On the first day of the month, sunrise is at 5:53 am and sunset at 8:09 pm. On the last day of August, sunrise is at 6:22 am and sunset at 7:28 pm CDT.
Sunshine
In Merna, Illinois, the average sunshine in August is 9.6h.UV index
The months with the highest UV index in Merna are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In August, a regular UV index of 6 translates into these guidelines:
Deflect overexposure. Sun protection is a necessity. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Merna, IL
- Average high temperature in August: 79.9°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.7°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 (18.9°F).
Average pressure in August
Merna, 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
Merna, IL
- Average wind speed in August: 6.6mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in August
Merna, IL
- Average humidity in August: 83%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is October (71%).
Average rainfall in August
Merna, IL
- Average rainfall in August: 2.68"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is December (1.93").
Average rainfall days in August
Merna, IL
- Average rainfall days in August: 15.9 days
The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is February (6.9 days).
Average snowfall in August
Merna, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Merna, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (12.8 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
Merna, 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 18min).
- Average sunshine in August: 9h and 36min
The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in August
Merna, IL
- Average sunshine days in August: 11.8 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (8.4 days).
Average UV index in August
Merna, 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, October, November and December (UV index 2).
Average cloud cover in August
Merna, IL
- Average cloud cover in August: 33
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility in August
Merna, IL
- Average visibility in August: 5mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
