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
The advent of August reveals an average high-temperature of a still moderately hot 77.5°F (25.3°C), showing minimal difference from the prior month. Throughout August, a steady low-temperature average of 59.5°F (15.3°C) is noted.Humidity
In Castalia, the average relative humidity in August is 82%.Rainfall
In August, the rain falls for 12.3 days. Throughout August, 2.01" (51mm) of precipitation is accumulated. Throughout the year, there are 131 rainfall days, and 27.91" (709mm) of precipitation is accumulated.Snowfall
In Castalia, snow does not fall in June through September.Daylight
The average length of the day in August is 13h and 53min.On the first day of the month, sunrise is at 5:58 am and sunset at 8:27 pm. On the last day of August, in Castalia, sunrise is at 6:30 am and sunset at 7:42 pm CDT.
Sunshine
August has the most sunshine of the year, with an average of 9.8h of sunshine.UV index
The average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: In August, the maximum UV index of 5 suggests this advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Castalia in August?
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 Castalia have in August?
When is the sunrise / sunset in August?
What month has the most sunshine?
How long on average sun shines in August?
What is the UV index reading in August?
Average temperature in August
Castalia, IA
- Average high temperature in August: 77.5°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in August: 59.5°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure in August
Castalia, IA
- Average pressure in August: 29.96"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in August
Castalia, IA
- Average wind speed in August: 7mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in August
Castalia, IA
- Average humidity in August: 82%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (75%).
Average rainfall in August
Castalia, IA
- Average rainfall in August: 2.01"
The wettest month (with the highest rainfall) is June (4.33").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in August
Castalia, IA
- Average rainfall days in August: 12.3 days
The month with the highest number of rainy days is June (17.7 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in August
Castalia, IA
- Average snowfall in August: 0"
The month with the highest snowfall is February (5.16").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Castalia, IA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Castalia, 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 6min).
- 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
Castalia, IA
- Average sunshine days in August: 16.4 days
The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in August
Castalia, IA
- Average UV index in August: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in August
Castalia, 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
Castalia, IA
- Average visibility in August: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
Castalia, Iowa, USA
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