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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.
On average, there are 258 sunny days per year in Vallejo, California. The July high is around 79 degrees. The January low is 40. Sperling's comfort index for Vallejo is a 82 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54.