weather in estes park in september
Weather in Estes Park in September. The average maximum daytime temperature in Estes Park in September is a comfortable 16Â°C (61Â°F). There are usually 8 hours of bright sunshine each day, which represents 68% of the 12 hours of daylight. Expect 39mm (1.5 inches) of rainfall across the whole of September with 9 days with some rain falling.