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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.
Vallejo, California Average Temperature. The average temperature for Vallejo is 57.45Â°F, 2.90Â°F higher than the nationwide average (54.55Â°F), and 4.20Â°F lower than the California average of 61.65Â°F. In the summer, temperatures rise to 65.1Â°F on average, 9.3% lower than average - one of the 20% lowest recorded averages. The winter average of 50.4Â°F is 23% higher than the U.S. average.