August weather forecast
Rio Vista, CA

The last month of the summer, August, is another tropical month in Rio Vista, California, with an average temperature varying between 90.1°F (32.3°C) and 57.7°F (14.3°C).

Temperature

Rio Vista's shift into August is marked by a subtle change to a still hot 90.1°F (32.3°C) from July's 91°F (32.8°C) in temperature. Rio Vista reports a marked divergence from daytime peaks throughout August, with lows averaging at a refreshing 57.7°F (14.3°C).

Heat index

In August, the average heat index is computed to be a very hot 96.8°F (36°C). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'real feel', provides an understanding of perceived warmth by combining temperature and relative humidity. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

In August, the average relative humidity in Rio Vista, California, is 53%.

Rainfall

The only month without rainfall is August.

Daylight

In Rio Vista, 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

The average sunshine in August is 12h.

UV index

The months with the highest UV index in Rio Vista, California, are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum high daily UV index of 6 during August translates into the following directions:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.