September Was Hot in the US, But Not So Much in San Diego

September was one of the warmest ever in the United States, with records falling in 111 counties, but conditions were moderate in Southern California.

Most of the country baked under record heat in September as large swaths of hot air covered the Midwest and East. The final tally put September 2023 as the seventh warmest in the last 129 years.

The National Oceanic and Atmospheric Association (NOAA) said it was also the third-driest September ever recorded in the lower 48 states.