August weather forecast
Decorah, IA

Weather in August

August, the last month of the summer in Decorah, is another warm month, with temperature in the range of an average high of 77.2°F (25.1°C) and an average low of 59.4°F (15.2°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still moderately hot 77.2°F (25.1°C). In August, in Decorah, the average low-temperature is 59.4°F (15.2°C).

Humidity

In August, the average relative humidity is 81%.

Rainfall

In August, in Decorah, Iowa, the rain falls for 14.9 days. Throughout August, 2.6" (66mm) of precipitation is accumulated. Throughout the year, there are 149 rainfall days, and 30.59" (777mm) of precipitation is accumulated.

Snowfall

In Decorah, Iowa, snow does not fall in June through September.

Daylight

The average length of the day in August is 13h and 54min.
On the first day of August, sunrise is at 5:57 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 6:30 am and sunset at 7:44 pm CDT.

Sunshine

August has the most sunshine of the year, with an average of 9.8h of sunshine.

UV index

May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
[Resources]

FAQ

What is the temperature in August in Decorah?

In Decorah, in August, the average high-temperature is 77.2°F (25.1°C), and the average low-temperature is 59.4°F (15.2°C).

What is the average humidity in August in Decorah?

The average relative humidity in August in Decorah is 81%.

How many days does it rain in August in Decorah?

In Decorah, Iowa, in August, during 14.9 rainfall days, 2.6" (66mm) of precipitation is typically accumulated.

When it does not snow in Decorah?

June through September are months without snowfall.

What is the average length of the day in August in Decorah?

In August, the average day length in Decorah is 13h and 54min.

When is the sunrise / sunset in August in Decorah?

In August, on the first day of the month, sunrise is at 5:57 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 6:30 am and sunset at 7:44 pm CDT.

What month has the most sunshine in Decorah?

The month with the most sunshine in Decorah is August, with an average of 9.8h of sunshine.

How long on average sun shines in August in Decorah?

The average sunshine duration in August is 9.8h.

When is the highest UV index in Decorah?

The months with the highest UV index in Decorah are May through August, with an average maximum UV index of 5.

What is the UV index intensity in August in Decorah?

The average daily maximum UV index in August in Decorah, Iowa, is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Decorah, IA

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).

[Resources]

Average pressure in August
Decorah, IA

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).

[Resources]

Average wind speed in August
Decorah, IA

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).

[Resources]

Average humidity in August
Decorah, IA

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%).

[Resources]

Average rainfall in August
Decorah, IA

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").

[Resources]

Average rainfall days in August
Decorah, IA

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).

[Resources]

Average snowfall in August
Decorah, IA

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").

[Resources]

Average snowfall days in August
Decorah, IA

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).

[Resources]

Average daylight in August /
Average sunshine in August
Decorah, IA

Average daylight in August / Average sunshine in August - Decorah, IA
  • Average daylight in August: 13h and 54min

The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 2min).

  • Average sunshine in August: 9h and 48min

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).

[Resources]

Average sunshine days in August
Decorah, IA

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).

[Resources]

Average UV index in August
Decorah, IA

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).

[Resources]

Average cloud cover in August
Decorah, IA

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).

[Resources]

Average visibility in August
Decorah, IA

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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location