Best Time Of The Year. July and November are good months to book flights. They tend to be months when other people are not planning their holidays, so they feature a low demand for airline tickets and consequent low prices. September, after the summer holidays, and January, after Christmas and Thanksgiving holidays, are months to avoid.
Weather in Denver in September. The average maximum daytime temperature in Denver in September is a warm 25Â°C (77Â°F). There are usually 9 hours of bright sunshine each day, which represents 73% of the 12 hours of daylight. Expect 30mm (1.2 inches) of rainfall across the whole of September with 7 days with some rain falling.
for denver's nine month snow period of september through may, march ranks as the snowiest month and typically accounts for 20 percent of the annual snowfall. denver normally collects 10.7 inches of snow in march based on averages from old stapleton intl airport (1981-2010 averages), however march is known for the biggest snowfall events to hit the region. in recent history for example, march 1992 and 2003 come to mind for most.