Spring weather is unpredictable, with stormy, wet days being common, mixed with occasional warm, sunny weather. Precipitation is normally heaviest in March. Spring wildflowers bloom from April through June, peaking in May. Fall days are usually clear and mild; nights are often cool.
Summer days are hot (95 to 110 °F; 35 to 43 °C), but overnight lows are usually comfortable (65 to 70 °F; 18 to 21 °C). Afternoon thunderstorms are common from mid-July through mid-September. Storms may produce waterfalls as well as flash floods. If you are hiking bring lots of water, so you don’t dehydrate. Bring a hat too. It may be a dry heat, but it is still hot.
Autumn tree-color displays begin in September in the high country; in Zion Canyon, autumn colors usually peak in late October. This is a beautiful time of year to visit. There are still large crowds through Thanksgiving.
Winter in Zion Canyon is mild. Winter storms bring rain or light snow to Zion Canyon and heavier snow to the higher elevations. Clear days may become quite warm, reaching 60 °F (16 °C); nights are often 20 to 40 °F (−7 to 4 °C). Winter storms can last several days and make roads icy. Zion roads are plowed, except the Kolob Terrace Road which is closed when covered with snow. Winter driving conditions last from November through March.Zion has become very crowded in the past few years. Even though the weather is cooler in the winter months, it is a great time to visit the park without all the other visitors. You can also drive your car directly into the park during the winter (check the dates of the shuttle service).
General Utah weather information
LA VERKIN WEATHER