July weather forecast
Sonoma, CA

July sits in the heart of the summer season in Sonoma, boasting the highest temperatures of the year, peaking at 82.8°F (28.2°C). Nighttimes remain relatively cool, offering a welcome relief from the scorching heat of the day. The weather is predominantly arid, characterized by the conspicuous absence of rainfall. With a dominant sun presence overseeing clear skies, the UV index reaches its yearly peak. Despite the high heat and the omnipresent sun, the wind speed lowers, thus maintaining a calm atmosphere in the city.

Temperature

The onset of July manifests an average high-temperature of a still warm 82.8°F (28.2°C), demonstrating a minor variation from the preceding month. In July, the nighttime temperature plummets remarkably from the daily apex to a steady average of 54.1°F (12.3°C).

Heat index

For July, the heat index is appraised at a tropical 86°F (30°C). Persistently participating in activities during exposure may lead to fatigue and induce heat cramps.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', gauges the sensation of temperature factoring in the air's moisture content. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.

Humidity

The average relative humidity in July is 62%.

Rainfall

July and August are months with the least rain when the rain falls for 1.3 days and typically aggregates up to 0.04" (1mm) of rain.

Daylight

In Sonoma, the average length of the day in July is 14h and 31min.
On the first day of the month, sunrise is at 5:50 am and sunset at 8:37 pm. On the last day of July, sunrise is at 6:12 am and sunset at 8:20 pm PDT.

Sunshine

July has the most sunshine of the year, with an average of 12h of sunshine.

UV index

The months with the highest UV index are June and July, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 6 during July translates into these guidelines:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.