The climate in San Diego during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in San Diego and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 23°C (74°F) is normal.
|Daytime temperature||31.2°C 88.2°F|
|Nightly temperature||23.4°C 74.1°F|
|Average temperature||27.3°C 81.1°F|
|Daily sunshine||5.9 hrs|
|Avg rainfall||299 mm 11.8 ins|
|Rainy days||19 days|
|Sea temperature||29.3°C 84.8°F|
|Windspeed||6.5kph 4 mph|
On average September is the 4th wettest month of the year in San Diego with around 299mm 11.8 inches of rain making it a very wet time to visit. This rainfall is typically spread over 19 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.9 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in September 2019.
|Hottest month:||May||32.9°C 91.2°F|
|Driest month:||March||71mm 2.8ins|
|Coldest month:||January||28.3°C 82.9°F|
|Wettest month:||October||406mm 16ins|