This is already the hottest summer in Austin's history — shattering the previous record — but the sweltering city might not be done setting dubious milestones in 2009. Two more days of triple digits will tie the record for the most 100-degree temperatures in a year: 69 days of lawn-killing, air conditioner-straining heat. A typical year has 12 triple-digit days. The 1925 record appears safe for at least the next few days, with highs forecast in the 90s.