San Francisco, CA Hit 100ยบF Yesterday | Highest June Temperature in More Than a Century San Francisco International Airport yesterday reached its highest temperature ever recorded in the month of June: 100 degrees. In fact, this was the highest temperature ever measured at the airport in June, July or August. 100-degree readings don’t usually hit until September. With records going back to the Gold Rush, this beats the previous same-day high of 88 degrees hit […] Weather WeatherBrains | June 11, 2019 0 Comments