Turlock has hot, mostly dry summers and cool, wet winters. Average January temperatures are a maximum of 53.7 °F (12.1 °C) and a minimum of 38.1 °F (3.4 °C). Average July temperatures are a maximum of 104.4 °F (40.2 °C) and a minimum of 62.6 °F (17.0 °C). There are an average of 78.0 days with highs of 90 °F (32 °C) or higher and an average of 19.8 days with lows of 32 °F (0 °C) or lower. The record high temperature was 114 °F (46 °C) on July 9, 1896. The record low temperature was 18 °F (−8 °C) on January 21, 1922, and December 19, 1924.
The average annual precipitation is 11.88 inches (302 mm). There are an average of 48 days with measurable precipitation. The wettest year was 1983 with 27.03 inches (687 mm) and the dryest year was 1953 with 5.32 inches (135 mm). The most precipitation in one month was 8.47 inches (215 mm) in February 1998. The most precipitation in 24 hours was 2.70 inches (69 mm) on December 11, 1906. Although snow is very rare in Turlock, 3.0 inches (76 mm) fell in January 1922 and 2.0 inches (51 mm) fell in February 1976.