The average temperature in Zion National Park in September for a typical day ranges from a high of 82°F (28°C) to a low of 54°F (12°C).
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The Narrows is fantastic in September when the temperature is still warm enough to enjoy being in the water. Make sure to check online or at the visitor center for a flash flood advisories, however, because the Narrows is very prone to them during monsoon season.
Planning for Your Zion TripThere are certain times of the year when flash floods are more likely to occur. Monsoon season, which runs from mid-July to mid-September, is when flash floods have the highest probability of occurring.
The Narrows hike is easy-to-moderate. It is easy because there are no steep inclines or declines, and since it is an out-and-back hike, it can be as long or as short as you want it to be.
weather in septemberSeptember is a beautiful month to visit Bryce Canyon. The precipitation in September is far less than it is in July and August with an average of only four thunderstorms. The average high is 70 and the average low is 42 degrees Fahrenheit (21/5 degrees Celsius).
Best Time to Go to Zion National Park to Avoid CrowdsThe least crowded months in Zion are December to February when the weather is cold. If you're looking for warmer weather with fewer crowds, consider visiting from March to April or October to November instead.
As with most national parks, Zion's busiest season is when the kids are off school and most people take their vacations. That means weekends much of the year and the most crowded time between Memorial Day and Labor Day. Despite the hot temperatures — and 100-degree days are common — summer draws the biggest crowds.
Ideally, you need two to three days to really explore Zion National Park. This will give you enough time to hike one of the longer trails such as Angels Landing or the Narrows and enjoy all the major viewpoints.
October is a gorgeous time to hike the Narrows. The later you get in the month, the better the fall colors will be and you will share the canyon with just a few other people. But you also have to take into account shorter days, colder temperatures, and the reduced Zion shuttle schedule.
A hike through The Narrows requires hiking in the Virgin River. You must get your feet wet since there is no trail. Most people choose to start their hike from the Temple of Sinawava via the Riverside Walk and then walk upstream before turning around and hiking back down to the Temple of Sinawava.
Dry pants or dry suit — the river can be very cold in the fall, winter, and spring, so you'll need extra gear if you plan on hiking during those seasons. If the water is cold, make sure you choose an outfitter that provides thicker neoprene socks and high-quality dry pants that won't leak through.