Commerce experiences a classic Mediterranean climate (Köppen climate classification *Csa*), characterized by warm, dry summers and mild, occasionally wet winters. It enjoys abundant sunshine year-round, making it a comfortable place to live and visit at almost any time of the year.
Summer temperatures typically range from the low 60s to the mid-80s Fahrenheit (16–30°C), though late summer heat waves can occasionally push daytime highs into the 90s or low 100s. Winters are delightfully mild, with average highs in the upper 60s (20°C) and overnight lows rarely dipping below the mid-40s (7°C).
Rainfall is sparse and highly seasonal, occurring almost entirely between November and April, with the city averaging about 14 to 15 inches of rain annually. Snow is virtually unheard of. Natural disaster risks primarily stem from the region's seismic activity, as Southern California is home to several major fault lines. Occasional extreme heat and poor air quality—exacerbated by heavy freight traffic—are also environmental factors.
