August weather forecast
Yosemite National Park, CA

August in Yosemite National Park continues with warm temperatures, similar to those experienced in July. With barely any rainfall, it becomes the second driest month, receiving only 0.2" (5mm). Ample daylight of 13.6 hours combined with 11 hours of abundant sunshine casts a radiant charm on the park's landscape. Water activities become a popular choice, with visitors opting for swimming or rafting in the park's sparkling rivers and lakes. With an ideal weather scenario, wildlife encounters are equally probable.

Temperature

As Yosemite National Park, California, steps into August, the average high-temperature is measured at a still tropical 89.4°F (31.9°C), displaying minor differences from July's 90°F (32.2°C). Throughout August, Yosemite National Park acknowledges a distinct difference between its daytime highs and the steady low average of 52°F (11.1°C).

Rainfall

The month with the least rainfall is August, when the rain falls for 1 days and typically collects 0.2" (5mm) of precipitation.

Snowfall

In Yosemite National Park, California, snow does not fall in June through September.

Daylight

The average length of the day in August is 13h and 35min.
On the first day of the month, sunrise is at 6:02 am and sunset at 8:06 pm. On the last day of August, sunrise is at 6:28 am and sunset at 7:28 pm PDT.

Sunshine

The average sunshine in August is 11h.

UV index

The average daily maximum UV index in August in Yosemite National Park is 10. A UV Index estimate of 8 to 10 represents a very high health hazard from unsafe exposure to UV radiation for the average person.
Note: A maximum high daily UV index of 10 during August translates into the following directions:
Emphasize protection. Neglecting it can lead to swift damage to the skin and eyes. 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. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Ensure the liberal application and reapplication of a broad-spectrum SPF 30+ sunscreen after each outdoor activity or swim, and every two hours.