The autumn equinox is tomorrow (Thursday) at 8:21 AM MDT. Expect this coming weekend to be much cooler than last weekend, with a scattering of showers possible in the mountains.
A Pacific cold front should be moving east through western Colorado early Friday, and probably through the Front Range region late Friday. A brief burst of rain and squally winds may accompany the cold front, but a widespread significant rain is not expected. Above treeline a light accumulation of snow may whiten some mountaintops.
Saturday and Sunday are likely to be mainly dry, but because of cold air in the upper atmosphere I can’t rule out a brief shower in the afternoon, especially in high elevations where it could be snow or graupel. And for those who don’t know, graupel is small snow pellets that form in convective clouds, fairly common in the mountains in summer and early autumn.