Vacaville

What is the climate like in Vacaville?

The best time to visit Vacaville is typically April – October, with trip comfort peaking in July (9.4/10). Vacaville is warmest in August, when daily highs average 88°F (31°C), and coolest in December, when lows fall to about 43°F (6°C). The wettest month is typically January and the driest is August; the year sees roughly 21 in (546 mm) of precipitation.

• Best time to visitApril – October — comfort peaks in July (9.4/10)
• Warmest monthAugust — average high 88°F (31°C)
• Coolest monthDecember — average low 43°F (6°C)
• Wettest monthJanuary (5.0 in (126 mm))
• Driest monthAugust (0.0 in (0 mm))
• Annual precipitation21 in (546 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromTravis AFB, 11 km away (1947-2026)