Denver:

August is a month of warm days, frequently featuring an afternoon thunderstorm that passes through the area very quickly.  Prolonged rain is very rare, however when it does rain it can rain very hard for a very short period of time.  Most people seek shelter for a while to wait out the storm; a surprisingly large  number of Coloradoans do not own an umbrella!

Early August daytime temperatures in Denver average 88-degrees with the good possibility of reaching the mid-90's some days.  At a mile high, the sun's heat is much stronger and U-V protection is recommended for sensitive skin.

Humidity is usually quite low, leading to the quick evaporation of perspiration.  Therefore it is critical to maintain proper hydration since you may not be aware of water loss through the skin.  It is highly recommended that you carry a bottle of water with you when you travel.

Nighttime temperatures drop to about 60-degrees after the sun goes down.

It has never snowed in Denver in August!  (Well, not since record keeping began in 1873.)

The Mountains:

Mountain temperatures are almost always lower than Denver temperatures; the difference increases as you climb in altitude.  A hot day in Denver (95-degrees) can translate to a comfortable day in the mountains (70-80 degrees.)

A light jacket is always recommended for travel to the mountains, even though it is hot in Denver.

Quick afternoon rain showers are to be expected, with the sun coming right back out after the squall has passed.  Frequently the temperature drops a bit during the shower and stays lower for the rest of the day.

It HAS snowed in the Colorado mountains in August, but that is fairly unlikely where we will be going.  If you plan personal travel to Rocky Mountain National Park or other places with elevations over 10,000-feet, you may want to bring a medium-weight jacket, since temperatures will be cooler and the mountain winds will chill you if the sun goes behind a cloud.