San Diego weather in October
Temperature, sea and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Good
Best time to visit: July – September
What is the weather like in San Diego in October?
In October, San Diego is warm: daytime highs average 23 °C, and nights cool down to about 15 °C. The sea averages 19.2 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain is rare: about 2 days bring 17 mm in total. All in all, October is a good month for a holiday in San Diego.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 88 | 69 | 44 |
| Day | 25° | 23° | 20° |
| Night | 18° | 15° | 12° |
| Sea | 21° | 19° | 17° |
| Sun | 9 h | 8 h | 7 h |
| Rain days | 1 | 2 | 4 |
More details for October
- Daylight
- 11 h 25 min06:52 – 18:17
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or more
- Wind
- 16 km/haverage daily peak
- Cloud cover
- 34 %on average
- Hot days
- 1 day30 °C or more
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 35 %68 %
- Seaweight 25 %31 %
- Sunshineweight 20 %87 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
San Diego in October: quick answers
Is San Diego hot in October?
Warm rather than hot: in October, daytime highs in San Diego average 23 °C and nights cool to about 15 °C. On about 1 days the thermometer climbs to 30 °C or more.
Can you swim in San Diego in October?
Only if you don't mind cold water: in October the sea averages just 19.2 °C. Comfortable swimming is possible from July to September.
Does it rain much in San Diego in October?
Rain is rare: about 2 days bring 17 mm in total.
San Diego month by month
The whole year in San DiegoAll destinations: USAWhere to go in OctoberSea temperature in October
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)