August weather forecast
Rio Vista, CA

August, the last month of the summer in Rio Vista, is also a hot month, with temperature in the range of an average high of 90.1°F (32.3°C) and an average low of 57.7°F (14.3°C).

Temperature

With the onset of August, Rio Vista's average high-temperature clocks in at a still tropical 90.1°F (32.3°C), showing a minor fluctuation from the previous month. Rio Vista anticipates a considerable daily temperature fluctuation in August, with low temperatures averaging a moderate 57.7°F (14.3°C).

Heat index

August's average heat index is estimated at a sweltering 96.8°F (36°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
In the scope of the heat index, its values resonate with shade and light wind conditions. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

The average relative humidity in August is 53%.

Rainfall

The only month without rainfall is August.

Daylight

In Rio Vista, California, the average length of the day in August is 13h and 35min.
On the first day of August, sunrise is at 6:10 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 7:37 pm PDT.

Sunshine

In Rio Vista, the average sunshine in August is 12h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index in Rio Vista. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: A daily maximum UV index of 6 in August translates into the following instructions:
Prevent overexposure. Protection from the sun's harmful effects is needed. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.