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
As August takes its course, Keystone's average high-temperature registers at a still warm 79.5°F (26.4°C), closely aligning with the preceding month. During the month of August, an average temperature of 61.9°F (16.6°C) is noted during the nights.Humidity
The average relative humidity in August in Keystone is 81%.Rainfall
In August, the rain falls for 13.3 days. Throughout August, 2.24" (57mm) of precipitation is accumulated. In Keystone, during the entire year, the rain falls for 139 days and collects up to 29.49" (749mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in August is 13h and 49min.On the first day of the month, sunrise is at 6:03 am and sunset at 8:27 pm. On the last day of August, sunrise is at 6:34 am and sunset at 7:43 pm CDT.
Sunshine
In August, the average sunshine is 9.7h.UV index
In August, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In August, the maximum UV index of 5 transforms into these recommendations:
Undertake protective steps - Preventing sun damage is advised. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average August temperature?
What is the average humidity in August?
How many days does it rain in August?
When it does not snow?
How many hours of daylight does Keystone have in August?
When is the sunrise / sunset in August?
How long on average sun shines in August?
What is the UV index reading in August?
Average temperature in August
Keystone, IA
- Average high temperature in August: 79.5°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 (25.9°F).
- Average low temperature in August: 61.9°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in August
Keystone, IA
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in August
Keystone, IA
- Average wind speed in August: 7mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in August
Keystone, IA
- Average humidity in August: 81%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in August
Keystone, IA
- Average rainfall in August: 2.24"
The wettest month (with the highest rainfall) is May (4.61").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in August
Keystone, IA
- Average rainfall days in August: 13.3 days
The month with the highest number of rainy days is June (19.3 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in August
Keystone, IA
- Average snowfall in August: 0"
The month with the highest snowfall is January (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Keystone, IA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Keystone, IA
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 9h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in August
Keystone, IA
- Average sunshine days in August: 15.1 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is June (8.4 days).
Average UV index in August
Keystone, IA
- Average UV index in August: 5
The month with the highest UV index is June (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
Keystone, IA
- Average cloud cover in August: 31
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in August
Keystone, IA
- Average visibility in August: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Keystone, Iowa, USA
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