Average Weather in September in Zion Illinois, United States. During the hottest months of the year—July through mid-September—the desert bakes under intense solar radiation. September is a month of change in Zion and Bryce. Historically, the monsoon weather patterns exits the region in the middle of the month. Average temperatures by month. September in Zion National Park offers pleasing temperatures and clear skies. Zion National Park Weather in September. April and May and September and October are usually warm and sunny with highs between 60 and 90 degrees on average. Average Weather during September in Zion National Park, United States of America. Kids are back in school, things start to cool off in Bryce (not too much in Zion), and the very active weather pattern of our monsoon season ends. Prepare accordingly by always checking the current and forecast weather conditions, as well as any park warnings. Zion’s weather is heavily influenced by the North American Monsoon, which affects seasonal precipitation throughout the American Southwest. Calendar overview of Months Weather Forecast. Always check the weather before heading into the Narrows. Most late summer afternoons have a chance of rain in the forecast. High temperature: 91°F (33°C) Low temperature: 60°F (16°C) Hours daylight/sun: 12 hours Rainy days to be expected:4. Autumn in Zion: September, October, November Autumn is one of my favorite times to visit Zion due to comfortable temperatures, slightly reduced crowds, and—best of all—stunning foliage. Mid September marks the end of “monsoon” season in Zion. After Labor Day, crowds and temperatures drop, making September a wonderful month to visit Zion. On average, Zion receives the most precipitation in March. The average minimum temperature (usually the minimum temperature is noted during the night) in Zion National Park in September is 17.6°C (63.68°F). September is a dry month with an average of 15mm (0.6in) rain. Averages By Month. Monsoon Season Zion Summer Weather. Free Long Range Weather Forecast for Zion National Park, Utah. Zion, IL Monthly Weather 6:24 am CST Dec 2019 Jan 2020 Feb 2020 Mar 2020 Apr 2020 May 2020 Jun 2020 Jul 2020 Aug 2020 Sep 2020 Oct 2020 Nov 2020 Dec … Spring and fall have the more moderate weather and might be the best time to visit Zion. These storms have potential to drop large amounts of water, creating dangerous flash floods. See also Best Times to Visit Zion National Park. When visiting Zion National Park in the fall be sure to bring your camera to capture the breathtaking colors of autumn. However, expect occasional cool and even rainy spells during these months. Rain during any time of the year can bring flash floods. Temperatures at Zion National Park vary greatly from low teens up to 100 degrees F. 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