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San Diego's Warmest Weather, on average, should occur in August through early September, according to statistics compiled from several decades of measurements taken near the San Diego International Airport. In an average year, coastal residents enjoy an average daily temperature of 70°, which compares favorably (depending on your viewpoint) with the January average daily temperature of 55°. The range between the high and low is typically 10° or less this time of year. August's warm, semi-tropical weather will eventually give way to September's and October's slightly cooler days interspersed with occasional heat waves brought on by Santa Ana conditions -- dry, hot winds that sweep down the mountain slopes from the interior.
San Diego's Warmest Weather, on average, should occur in August through early September, according to statistics compiled from several decades of measurements taken near the San Diego International Airport. In an average year, coastal residents enjoy an average daily temperature of 70°, which compares favorably (depending on your viewpoint) with the January average daily temperature of 55°. The range between the high and low is typically 10° or less this time of year. August's warm, semi-tropical weather will eventually give way to September's and October's slightly cooler days interspersed with occasional heat waves brought on by Santa Ana conditions -- dry, hot winds that sweep down the mountain slopes from the interior.