San Diego Weather In September

The biggest difference between San Diego Weather in September and the weather in the prior months is the increased chance of high temperatures. These high temperatures are cause by strong Santa Ana winds. However, despite the increased chance of seeing days that are above 90°F, September is overall slightly cooler than August.

If you to bet, you should wager that the September San Diego Weather will still be excellent: warm, dry, and very enjoyable. But for the first time in months you might want to actually pay attention to the weather report.