San Diego Weather in September

San Diego in September sees high temperatures, with highs around 26°C (79°F) and overnight lows of 18°C (64°F). With just 4.3 mm (0.2 in) of rainfall on average, rain is rarely an issue.

Rainfall in San Diego in September

This month experiences about a single day of rain according to historical data, averaging 4.3 mm (0.2 in). If rain does fall, it tends to be a moderate shower rather than anything heavy.

Temperature in San Diego in September

September is one of the better months to visit San Diego. Expect 26°C (79°F) during the day and 18°C (64°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 18°C (64°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions. This is typically the warmest month of the year, so light summer clothing is a good idea.

Sunshine in San Diego in September

The city usually sees around 253 hours of sunlight, indicating many sunny days , a great month for sightseeing.

If your ideal day consists of dry skies and pleasant temperatures, January, February, March, April, May, June, July, August, September, October and November typically offer the best circumstances for San Diego.