Henderson is a typical desert climate city located on the edge of the Mojave Desert.

The average annual temperature is around 20 degrees Celsius (68°F), and the annual rainfall is about 100mm (4 inches), making it extremely dry. Based on data from the National Oceanic and Atmospheric Administration (NOAA), here is a detailed overview of Henderson's seasonal weather.

Spring (March to May) is one of the most pleasant seasons in Henderson. The average high temperature in March is about 18 degrees Celsius (64°F), and the average low at night is around 7 degrees Celsius (45°F). In April, the high temperature can rise to about 23 degrees Celsius (74°F). By May, daytime temperatures start to reach around 30 degrees Celsius (86°F), but the low humidity means the heat is not too oppressive. Spring is also the time when desert wildflowers bloom, and the hiking trails in the nearby Red Rock Canyon National Conservation Area are particularly beautiful during this season. Spring rainfall averages only 5 to 8mm per month, and there are occasional windy days.

Summer (June to September) is the harshest season in Henderson. The intense heat begins in June, with many days in July and August seeing high temperatures averaging over 40 degrees Celsius (104°F). The highest recorded temperature has been around 47 degrees Celsius (117°F). Fortunately, the humidity is very low, so the 'dry heat' allows for some relief in the shade, but prolonged outdoor activities can lead to dehydration and heatstroke. From mid-July to September, it is the 'Monsoon Season,' during which sudden thunderstorms and heavy rainfall can occur due to moisture from the Gulf of Mexico. The average monthly rainfall in summer is about 10 to 15mm, the highest of the year, but it is still very dry overall.

Autumn (October to November) is one of the most livable seasons in Henderson, along with spring. The average high temperature in October is about 26 degrees Celsius (79°F), and in November, the daytime temperature drops to around 17 degrees Celsius (63°F). The temperature difference between day and night can be 10 to 15 degrees, so a light jacket is needed in the mornings and evenings. Rainfall is very low, similar to spring, and clear skies and crisp air are common. Autumn is the best time to visit outdoor attractions near Henderson, with popular sites like Lake Mead, Hoover Dam, and Red Rock Canyon bustling with visitors.

Winter (December to February) is the mildest season in Henderson. The average high temperature in December is about 12 degrees Celsius (54°F), and in January, it is around 10 degrees Celsius (50°F). There are days when nighttime temperatures drop below freezing (around -3 degrees Celsius/27°F), but the characteristic is a significant temperature difference between day and night rather than continuous cold. Snowfall in Henderson is very rare. Historically, measurable snowfall in the city has occurred only once or twice in several decades, and accumulation is almost nonexistent. However, Mount Charleston, located about an hour's drive from Henderson (elevation about 3,600m), offers skiing and snowboarding in winter, attracting many residents looking for winter sports for day trips.

Summarizing Henderson's annual rainfall statistics, the average total annual precipitation is about 99 to 105mm (approximately 4 inches), making it extremely dry. This is about one-tenth of the national average annual precipitation of around 890mm (35 inches). Rainfall mainly occurs during winter from Pacific frontal systems and is concentrated during the summer monsoon period. Snowfall averages about 1 to 2mm per year, which is practically negligible. Thanks to the dry climate, issues related to mold and moisture in homes are minimal, but residents commonly experience dry skin and static electricity problems.

Henderson enjoys one of the highest levels of sunshine in the United States. The average annual sunshine hours are about 3,825 hours, placing it in the top 5% of cities nationwide. Over 294 days a year are typically sunny, with cloudy days being rare. The UV index is also very high in summer (UV Index 10 to 11), so caution is needed regarding sun protection during outdoor activities. Overall, Henderson's climate is quite pleasant for living, except for the extreme summer heat, making it an ideal environment for those who dislike snow and rain.