August weather forecast and climate
Castle Rock, CO

The scenic setting of Castle Rock City in Colorado
The scenic setting of Castle Rock City in Colorado

Weather in August

The last month of the summer, August, is also a moderately hot month in Castle Rock, Colorado, with average temperature fluctuating between 56.5°F (13.6°C) and 82°F (27.8°C).

Temperature

In Castle Rock, the average high-temperature is almost the same as in July - a still moderately hot 82°F (27.8°C). In August, in Castle Rock, the average low-temperature is 56.5°F (13.6°C).

Heat index

In August, the average heat index is appraised at 82.2°F (27.9°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, metabolic differences, wind, and pregnancy affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Castle Rock, the average relative humidity is 46%.

Rainfall

In August, in Castle Rock, Colorado, the rain falls for 13.3 days. Throughout August, 1.14" (29mm) of precipitation is accumulated. In Castle Rock, Colorado, during the entire year, the rain falls for 107.3 days and collects up to 13.7" (348mm) of precipitation.

Snowfall

In Castle Rock snow does not fall in July through September.

Daylight

The average length of the day in August is 13.7h.

Sunshine

June through August, with an average of 11.8h of sunshine, are months with the most sunshine in Castle Rock, Colorado.

UV index

In Castle Rock, the average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 in August interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in August in Castle Rock?

In Castle Rock, in August, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 56.5°F (13.6°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines both air temperature and relative humidity, in August is appraised at 82.2°F (27.9°C).

What is the average humidity in August in Castle Rock?

In August, the average relative humidity is 46%.

How much does it rain in Castle Rock in August?

In Castle Rock, in August, it is raining for 13.3 days, with typically 1.14" (29mm) of accumulated precipitation.

When it does not snow in Castle Rock?

In Castle Rock, Colorado, snow does not fall in July through September.

What is the average length of the day in August in Castle Rock?

In Castle Rock, Colorado, the average length of the day in August is 13.7h.

What are the months with the most sunshine in Castle Rock?

Months with the most sunshine in Castle Rock are June through August, with an average of 11.8h of sunshine.

How many hours of sunshine does Castle Rock have in August?

In August, the average sunshine in Castle Rock, Colorado, is 11.8h.

What is the UV index reading in August in Castle Rock?

In August, the average daily maximum UV index in Castle Rock is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in August
Castle Rock, CO

Average temperature in August - Castle Rock, CO
  • Average high temperature in August: 82°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is December (39.6°F).

  • Average low temperature in August: 56.5°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is December (20.1°F).

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Average pressure in August
Castle Rock, CO

Average pressure in August - Castle Rock, CO
  • Average pressure in August: 30.01"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are April and June (29.91").

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Average wind speed in August
Castle Rock, CO

Average wind speed in August - Castle Rock, CO
  • Average wind speed in August: 6.5mph

The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest months (with the lowest average wind speed) are July, August and September (6.5mph).

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Average humidity in August
Castle Rock, CO

Average humidity in August - Castle Rock, CO
  • Average humidity in August: 46%

The month with the highest relative humidity is February (66%).
Months with the lowest relative humidity are June and September (45%).

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Average rainfall in August
Castle Rock, CO

Average rainfall in August - Castle Rock, CO
  • Average rainfall in August: 1.14"

The wettest month (with the highest rainfall) is May (2.24").
The driest months (with the least rainfall) are January and December (0.55").

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Average rainfall days in August
Castle Rock, CO

Average rainfall days in August - Castle Rock, CO
  • Average rainfall days in August: 13.3 days

The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is November (3 days).

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Average snowfall in August
Castle Rock, CO

Average snowfall in August - Castle Rock, CO
  • Average snowfall in August: 0"

The month with the highest snowfall is April (7.13").
Months with the least snowfall are July, August and September (0").

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Average snowfall days in August
Castle Rock, CO

Average snowfall days in August - Castle Rock, CO
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (9.8 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in August /
Average sunshine in August
Castle Rock, CO

Average daylight in August / Average sunshine in August - Castle Rock, CO
  • Average daylight in August: 13.7h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in August: 11.8h

Months with the most sunshine are June, July and August (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 6.8h).

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Average sunshine days in August
Castle Rock, CO

Average sunshine days in August - Castle Rock, CO
  • Average sunshine days in August: 12.3 days

The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is July (10.6 days).

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Average UV index in August
Castle Rock, CO

Average UV index in August - Castle Rock, CO
  • Average UV index in August: 5

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average cloud cover in August
Castle Rock, CO

Average cloud cover in August - Castle Rock, CO
  • Average cloud cover in August: 17

The month with the most cloud cover is April (Cloud cover 27).
The month with the least cloud cover is September (Cloud cover 15).

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Average visibility in August
Castle Rock, CO

Average visibility in August - Castle Rock, CO
  • Average visibility in August: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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