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
August proves to be the warmest month, recording an average peak temperature of 77.7°F (25.4°C) and a minimum temperature of 49.6°F (9.8°C).Humidity
The months with the lowest humidity in Castle Rock are July and August, with an average relative humidity of 73%.Rainfall
August is the month with the least rainfall. Rain falls for 6.6 days and accumulates 0.31" (8mm) of precipitation.Snowfall
April through October are months without snowfall in Castle Rock.Daylight
In August, the average length of the day in Castle Rock is 14h and 6min.On the first day of August, sunrise is at 5:54 am and sunset at 8:41 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 7:51 pm PDT.
Sunshine
The month with the most sunshine is August, with an average of 10.3h of sunshine.UV index
In August, the average daily maximum UV index in Castle Rock is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In August, the UV index of 4 transforms into the following advice:
Take precautions - Protection against sun damage is advised. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the hottest in Castle Rock?
What is the usual temperature for Castle Rock in August?
What are the least humid months in Castle Rock?
What is the average humidity in August in Castle Rock?
What is the driest month in Castle Rock?
How much does it rain in Castle Rock in August?
When it does not snow in Castle Rock?
What is the average length of the day in August in Castle Rock?
When are sunrise and sunset in August in Castle Rock?
What month has the most sunshine in Castle Rock?
How many hours of sunshine does Castle Rock have in August?
How high is the UV index in August in Castle Rock?
Average temperature in August
Castle Rock, WA
- Average high temperature in August: 77.7°F
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (42.4°F).
- Average low temperature in August: 49.6°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (32.5°F).
Average pressure in August
Castle Rock, WA
- Average pressure in August: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in August
Castle Rock, WA
- Average wind speed in August: 3.7mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest months (with the lowest average wind speed) are August and September (3.7mph).
Average humidity in August
Castle Rock, WA
- Average humidity in August: 73%
The months with the highest relative humidity are February and November (89%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in August
Castle Rock, WA
- Average rainfall in August: 0.31"
The wettest month (with the highest rainfall) is January (2.28").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in August
Castle Rock, WA
- Average rainfall days in August: 6.6 days
The month with the highest number of rainy days is March (17.5 days).
The month with the least rainy days is July (6.1 days).
Average snowfall in August
Castle Rock, WA
- Average snowfall in August: 0"
The month with the highest snowfall is February (1.02").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in August
Castle Rock, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in August /
Average sunshine in August
Castle Rock, WA
- Average daylight in August: 14h and 1min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in August: 10h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in August
Castle Rock, WA
- Average sunshine days in August: 21.9 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is April (10.5 days).
Average UV index in August
Castle Rock, WA
- Average UV index in August: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in August
Castle Rock, WA
- Average cloud cover in August: 37
The month with the most cloud cover is February (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in August
Castle Rock, WA
- Average visibility in August: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
Castle Rock, Washington, USA
Weather forecast for your location
2. Allow the app to use your location