September weather forecastDinosaur National Monument, UT

Weather in September

September marks a phase of transition between summer and autumn for the Dinosaur National Monument, Utah, with the high temperatures gradually giving way to truer fall weather. A unique characteristic of this month is the sharp decrease in high temperatures to around 77.7°F (25.4°C), yet with rainfall not too different from August, recording 1.2" (30mm). A gradual shortening of daylight hours hints at the forthcoming winter. September serves as a serene time for outdoor activities amidst the changing colors of nature.

Temperature

The onset of September coincides with a reduction in the average high-temperature, falling from a tropical 88°F (31.1°C) in August to a moderately hot 77.7°F (25.4°C). Dinosaur National Monument reports a substantial plunge from daytime highs during the nights of September, with an average low-temperature of 45.5°F (7.5°C).

Rainfall

In Dinosaur National Monument, in September, 1.26" (32mm) of precipitation is typically accumulated. Throughout the year, 11.61" (295mm) of rain is accumulated.

Snowfall

January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, Dinosaur National Monument receives 0.2" (5mm) of snow. In Dinosaur National Monument, during the entire year, snow aggregates up to 40.91" (1039mm).

Daylight

In Dinosaur National Monument, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:43 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:12 am and sunset at 6:58 pm MDT.