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Current Weather. The City of Vallejo has great weather throughout the year. Vallejo offers perfect weather for all the outdoor activities and nearby sports and recreation opportunities. The temperature ranges from an average of 47Â°F in the winter to an average of 70Â°F in the summer. The climate is dry most of the year, with calm winds blowing off the waterfront.
For example, the average daily high in San Francisco in July and August is 72 Â°F (22 Â°C), and in Walnut Creek, some 20 miles (32 km) inland, the average daily high in July and August is 90 Â°F (32 Â°C); a temperature gain of approximately one degree (Fahrenheit) per mile.orthwestern California has a temperate climate with rainfall of 15 inches (380 mm) to 50 inches (1,300 mm) per year. Some areas of Coast Redwood forest receive over 100 inches (2,500 mm) of precipitation per year.