July weather forecast
Rio Vista, CA

July, the same as June, in Rio Vista, California, is another tropical summer month, with an average temperature fluctuating between 91°F (32.8°C) and 57.2°F (14°C).

Temperature

Rio Vista records the warmest temperatures in July, averaging a high of 91°F (32.8°C) and a low of 57.2°F (14°C).

Heat index

July's average heat index is estimated at a very hot 96.8°F (36°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

The average relative humidity in July is 50%.

Rainfall

July is the last month it rains. During 0.8 rainfall days, in July, Rio Vista aggregates 0.04" (1mm) of precipitation. Throughout the year, in Rio Vista, there are 68.7 rainfall days, and 11.18" (284mm) of precipitation is accumulated.

Daylight

The average length of the day in July is 14h and 31min.
On the first day of July, sunrise is at 5:47 am and sunset at 8:33 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 8:16 pm PDT.

Sunshine

July has the most sunshine of the year in Rio Vista, with an average of 12.1h of sunshine.

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 estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In July, the maximum UV index of 6 transforms into these recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.