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Denver Climatological Preview - August 2023 |
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Preview of Thornton's August Weather - The Winding Down of Summer
The August overall average temperature of 72.5 degrees (1981 - 2010) makes it the second warmest month of the year behind July. At the start of the month Denver usually averages around 90 degrees for a high temperature. By the end of August that drops to 84 degrees. Similarly, nighttime lows drop from 60 to 54 from the start to the end of the month. As the end of the month comes, we start to notice our daylight hours getting fewer and even can feel a bit of a nip in the early morning air. Historical temperature extremes for August are somewhat interesting. First, the highest temperature ever reached in Denver was actually recorded in August - 105 degrees on August 8, 1878 (also tied on July 20, 2005, June 25, 2012 and June 26, 2012). Second, while there has never been snow in Denver in August, four times the mercury has dropped to 40 degrees to serve as a reminder the white stuff isn't too far off. Those chilly temperatures occurred on August 22, 1904 and August 24, 25 and 26, 1910. Generally clear skies can be expected between midnight and noon but the afternoon often brings showers and thunderstorms. These storms typically develop over the foothills then bring precipitation to the Denver metro area. The slow movement of storms can produce heavy rain. Despite that moisture, the chance for severe weather decreases considerably compared to the first two months of summer. Cooler air near the surface helps to create a stable atmosphere thus keeping thunderstorms from usually becoming too intense. After the middle of August, tornadoes and damaging hail are pretty rare. Denver's August Extremes August: Denver's Top 5 Warmest (mean temperatures): August: Denver's Wettest Outlook for August 2023 The long-range forecasts from the Climate Prediction Center do not indicate any significant drivers for out of the ordinary temperatures but do indicate it could be a wet one. The agency gives the vast majority of the state equal chances of seeing above, below or near average temperatures. In terms of precipitation, however, all but the southwestern corner of Colorado are given an above average probability of seeing above normal levels of precipitation. Temperature Normals and Extremes for August Monthly Temperature, Rainfall and Snowfall Extremes for August
* Historical weather statistics gathered from the National Weather Service's Denver / Boulder forecast office data archives. Numbers in parentheses reflect "old" normals from 1971 to 2000 before recent updating by the NCDC. |
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As summer vacations wind down and families prepare to send their kids back to school in August, Colorado weather also starts to settle down. The chances for severe weather decrease markedly during August and by the end of the month daytime temperatures are dropping quite a bit as well. 
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