Fall in Utah
Weather in September
September sees a drop in the heat index in Utah, with the passage of the long summer by the middle of the month. The scorching sun, and usually brown landscape give way to moderate sunshine and colorful scenery. Snow-capped peaks in the background add to the natural beauty.
The average high temperatures in early fall are in the warm 61°F (16.1°C) to hot 92°F (33.3°C) range, while the average low temperatures are in the cold 37°F (2.8°C) to mild 63°F (17.2°C) range. Saint George in the west registers temperatures in the 63°F (17.2°C) to 92°F (33.3°C) range. Rainfall is only to the tune of 1" (25.4mm) to 2" (50.8mm) statewide.
Forests, national, and state parks offer a diverse range of colors due to different microclimates. Mountain trails and lakeshores offer a fantastic array of colors. Autumn nights are cold in the north and east and mild in the south. Expect temperatures to drop further with the progress of the season. September is the beginning of the pleasant fall weather in Utah.
Weather in October
October lies in the middle of the fall season in Utah, with strikingly variable temperatures between day and night at various elevations. The average high temperatures tend to be comfortable in the 49°F (9.4°C) to 78°F (25.6°C) range, but the nights are cold in the 27°F (-2.8°C) to 50°F (10°C) range. The arid west experiences substantial diurnal temperature differences, with warm days ending in freezing nights. Cedar City in the west averages in the cold 34°F (1.1°C) to warm 66°F (18.9°C) range, while Moab in the south is between a mild 41°F (5°C) to warm 73°F (22.8°C).
While Utah does not inspire the awe of the brilliant fall season in New England, the cascade of colors constitutes brilliant hues shed by canyon maple, aspen, Douglas hawthorn, spruce, oak, and many more trees.
October brings the first snowflakes of the season in the mountains, and the atmosphere gradually turns cold. Driving through scenic byways is the best way to explore the peak fall foliage. Wear warm clothes, at least a sweater, during October evenings in Utah.
Weather in November
November brings cold weather to Utah as the autumn season begins to wind up. The average high temperatures are in the range of 36°F (2.2°C) to 64°F (17.8°C), while the average low temperatures drop well below freezing in the 16°F (-8.9°C) to 37°F (2.8°C) range.
The mountain ranges gather substantial snow above 20" (508mm), while the rest of the state records healthy numbers between 3" (76.2mm) to 8" (203.2mm). Cold fronts make their way through the mountain passes and scourge the land. Pacific storms occasionally invade the state with the beginning of the cold season. The daylight is still strong, and the sunshine is adequate for outdoor activities. The foliage is past its peak, and leaves begin to fall by the second half of November. Evenings are chilly, and the snowfall occurs even in the valleys.
Ski resorts open post-Halloween in much of the state. It is time to bring out warm clothes out of the closets. Tourist numbers dwindle in November in Utah as the cold takes its toll.