San Diego Weather in October
What's the weather like in San Diego (Calabarzon) in October 2025?
The climate in San Diego during October can be summarized as hot, humid and very wet.
October is in the fall / autumn in San Diego and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 23°C (74°F) is normal.
| Daytime temperature | 30.5°C 86.9°F |
|---|---|
| Nightly temperature | 23.3°C 73.9°F |
| Average temperature | 26.9°C 80.4°F |
| Daily sunshine | 6.1 hrs |
| Avg rainfall | 406 mm 16 ins |
| Rainy days | 20 days |
| Sea temperature | 29.2°C 84.6°F |
| Humidity | 84% |
| Windspeed | 7.9kph 5 mph |
On average October is the wettest month of the year in San Diego with around 406mm 16 inches of rain making it a very wet time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.1 hours of sunshine per day.
October temperatures in San Diego
October rainfall
October hourly sunshine
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 San Diego in October 2025.
Other monthly averages
Best places to visit in October
San Diego weather stats
| Hottest month: | May | 32.9°C 91.2°F |
|---|---|---|
| Driest month: | March | 71mm 2.8ins |
| Sunniest month: | April | 9hrs |
| Coldest month: | January | 28.3°C 82.9°F |
| Wettest month: | October | 406mm 16ins |
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