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.
...a statistical preview of denverâs march weather... denver's monthly mean temperature for march is 40.4 degrees (1981-2010 averages) and is denver's 5th coldest month of the year behind december, january, february and november respectively. march starts the month with a normal high of 50 degrees and ends with a normal high of 58 degrees.