July in Vallejo averages a daily high of 30.9°C with nights around 13.3°C. Rain is rare — about 0.1 wet days and 0mm across the month. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Vallejo is April–June.
Based on VALLEJO, CA US (6.1km), 1995–2024. 10 years of July data.