Commercial Roofing in
San Diego, CA

San Diego, California enjoys a mild Mediterranean climate, with warm, dry summers and cool, relatively wet winters. Average temperatures range from the mid-60s to mid-70s year-round, with minimal extremes compared to other U.S. cities. While this temperate weather is generally favorable for commercial roofing systems, the constant exposure to sunlight and UV radiation—especially during the long, dry summer months—can still lead to the gradual degradation of roofing materials. Over time, this exposure may cause cracking, fading, or loss of flexibility in membranes and sealants, particularly if the roofing system lacks adequate UV protection.

Rainfall in San Diego is concentrated mostly between November and March, with the rest of the year remaining very dry. Although annual precipitation totals are relatively low, when it does rain, it can come in heavy bursts that test a roof’s drainage system. Flat or low-slope commercial roofs are especially vulnerable to ponding water if drains or scuppers are clogged or improperly designed. Leaks and water infiltration can occur even with short-lived storms if the roofing system has existing vulnerabilities or has not been well-maintained.

San Diego’s coastal location also brings occasional marine layer fog and salt-laden air, which can contribute to the corrosion of metal roof components and reduce the lifespan of certain roofing materials. These factors make routine inspections and preventive maintenance essential, even in a climate that seems relatively mild. Nations Roof provides commercial property owners in San Diego with specialized roofing solutions that account for coastal exposure, sun damage, and moisture control, helping ensure consistent performance and extended roof life across all seasons.