September weather forecast
Death Valley National Park, CA

As Death Valley National Park steps into September, relief from the searing summer heat begins to materialize. While the daytime temperatures remain high at 106.5°F (41.4°C), it's a considerable decline from the peak summer heights. The UV index also drops down, indicating a decrease in the intensity of the sun's rays. A nominal presence of rainfall characterizes September weather. The gradual departure from the extreme summer heat suggests a transition towards the milder autumn season.

Temperature

Death Valley National Park's September weather shows a modest shift in high-temperatures, falling from August's life-threatening hot 114.6°F (45.9°C) to a scorching 106.5°F (41.4°C). A sharp contrast between day and night is prevalent in September with an average nighttime temperature of 75.6°F (24.2°C).

Rainfall

In September, in Death Valley National Park, the rain falls for 1 days. Throughout September, 0.2" (5mm) of precipitation is accumulated. Throughout the year, in Death Valley National Park, there are 20 rainfall days, and 2.36" (60mm) of precipitation is accumulated.

Daylight

In Death Valley National Park, the average length of the day in September is 12h and 24min.
On the first day of September, sunrise is at 6:20 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:32 pm PDT.

Sunshine

In Death Valley National Park, the average sunshine in September is 11h.

UV index

In Death Valley National Park, the average daily maximum UV index in September is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, a daily maximum UV index of 8 leads to the following instructions:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.