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
In August, the average high-temperature registers at a still warm 77.2°F (25.1°C), nearly identical to July's 78.4°F (25.8°C). Throughout the month of August, Decorah reports a steady low-temperature average of 59.4°F (15.2°C).Humidity
In August, the average relative humidity in Decorah is 81%.Rainfall
In August, in Decorah, the rain falls for 14.9 days. Throughout August, 2.6" (66mm) of precipitation is accumulated. Throughout the year, in Decorah, there are 149 rainfall days, and 30.59" (777mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Decorah.Daylight
In August, the average length of the day is 13h and 54min.On the first day of the month, sunrise is at 5:58 am and sunset at 8:28 pm. On the last day of August, in Decorah, Iowa, sunrise is at 6:31 am and sunset at 7:43 pm CDT.
Sunshine
With an average of 9.8h of sunshine, August has the most sunshine of the year.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index in Decorah. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 5 during August translates into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. 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 are August temperatures in Decorah?
What is the average humidity in August in Decorah?
How much does it rain in Decorah in August?
When it does not snow in Decorah?
How many hours of daylight does Decorah have in August?
When is the sunrise / sunset in August in Decorah?
What month has the most sunshine in Decorah?
How many hours of sunshine does Decorah have in August?
What are the months with the highest UV index in Decorah?
How high is the UV index in August in Decorah?
Average temperature in August
Decorah, IA
- Average high temperature in August: 77.2°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (22.3°F).
- Average low temperature in August: 59.4°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).
Average pressure in August
Decorah, IA
- Average pressure in August: 29.96"Hg
The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in August
Decorah, IA
- Average wind speed in August: 7mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in August
Decorah, IA
- Average humidity in August: 81%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is October (76%).
Average rainfall in August
Decorah, IA
- Average rainfall in August: 2.6"
The wettest month (with the highest rainfall) is June (5.04").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in August
Decorah, IA
- Average rainfall days in August: 14.9 days
The months with the highest number of rainy days are May and June (20.3 days).
The month with the least rainy days is February (4.4 days).
Average snowfall in August
Decorah, IA
- Average snowfall in August: 0"
The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Decorah, IA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Decorah, IA
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in August: 9h and 5min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in August
Decorah, IA
- Average sunshine days in August: 12.3 days
The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is June (7.1 days).
Average UV index in August
Decorah, IA
- Average UV index in August: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in August
Decorah, IA
- Average cloud cover in August: 32
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in August
Decorah, IA
- Average visibility in August: 6mi
The months with the highest visibility are March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, July and December (5mi).
Decorah, Iowa, USA
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