A recurring theme from most of 2025 for August. Thornton once again saw temperatures above normal and precipitation below, something that has happened far too often this year.
Above normal temperatures dominated the first three weeks of the month. Mercury readings in the 90s were common with only three days being below that mark. Precipitation was absolutely scarce with a mere 0.01 inches being recorded during the first 21 days of the month.
Thankfully, Mother Nature took mercy on us for the last 10 days of August. We saw temperatures cool a good bit with every day seeing below average readings. While precipitation wasn’t great, she also was kind enough to finally give us a couple days with much-needed rain.
Temperatures in Thornton came in at an average of 72.6 degrees for the month. This was a good bit above the 19-year running average for August of 71.8 degrees. It was also the sixth month in a row for Thornton with above average temperatures.
Out at DIA where Denver’s official records are taken, it was a good bit warmer. The Mile High City saw an average of 73.8 degrees for August 2025. This was above their long term average for August of 72.9 degrees.
In terms of precipitation, Thornton ended up with 0.51 inches in the bucket. Virtually all of that fell in the last seven days of the month. It was well below our running August average of 1.20 inches.
For Denver, they saw two days with thunderstorms that dumped a great deal of rain on the airport, storms that missed us. As a result, their rain total for the month was a surprising 4.12 inches. This was well above their long term average for August of 1.58 inches.
Click here to view Thornton’s complete August 2025 climate summary report.
