Climate almanac

Fairfield

California, United States · 38.25°, -122.04°

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What is the climate like in Fairfield?

The best time to visit Fairfield is typically April – October, with trip comfort peaking in July (9.4/10). Fairfield 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 fromFairfield, 4 km away (1950-2026)