This month will go down as San Diego’s hottest August on record. It was the second hottest month, any time of year, in city history. The month set or tied 15 daily records for either the highest maximum or minimum temperature. The August heat follows a similarly toasty July, making the July/August combination the second hottest in city history. And the heat comes near the tail end of the second driest rainfall season on record, dating back to 1850. The heat and the prolonged dryness set up the county for a challenging fall, which historically is when the region’s biggest and most destructive wildfires have struck.