October is one of the warmer months of the year in San Diego, with average highs near 26.5°C and lows around 13.4°C (mean 20°C). It is one of the drier months, averaging 16 mm of rainfall and 53% relative humidity across the period.
October is one of the warmer months of the year in San Diego. Across 45 years of records, the warmest Octobers in San Diego were 2003 and 2024 — when the month averaged 22.9°C — while the coldest was 1981 at 17.3°C. Typical October days reach 26.5°C with nights near 13.4°C. The long-term trend is warming, about 0.4°C per decade.
October is one of the drier months in San Diego, averaging 16 mm of rainfall. The wettest October on record was 2004 with 157 mm, while the driest were 1988, 2001 and 2024 at 0 mm.
Relative humidity in San Diego during October averages 53%. The most humid October was 2000 at 67%, and the least humid was 2008 at 37%.
October receives about 4.2 kWh/m²/day of solar energy in San Diego. The sunniest October was 2019 at 5.2 kWh/m²/day, and the cloudiest was 1987 at 3.4.
Average wind speed in San Diego during October is 2.1 m/s. The windiest October was 1981 at 2.7 m/s, while the calmest was 2024 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.1°C | 20.0°C | 19.4°C | 20.5°C | 21.1°C | +2°C |
| Avg High | 25.6°C | 26.7°C | 25.7°C | 27.0°C | 27.8°C | +2.2°C |
| Avg Low | 12.6°C | 13.3°C | 13.0°C | 14.0°C | 14.5°C | +1.9°C |
| Avg Rain | 20 mm | 9 mm | 23 mm | 15 mm | 9 mm | -11 mm |
October temperatures in San Diego have risen by about 2.2°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 4.3°C (1991) to a record high of 39.5°C (2024).
Rainfall in October is one of the drier months, averaging 16 mm, with a wettest year of 157 mm.
One of the best times to visit San Diego
October is one of the best times to visit San Diego. Expect days averaging 26.5°C and nights around 13.4°C (mean 20°C) — warmer than San Diego's yearly average — with low rainfall (16 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.8°C | 20.1°C | 13.4°C | 32.4°C | 9.4°C | 13 mm | 59% | 2 m/s | 4.6 |
| 2024 | 30.1°C | 22.9°C | 15.7°C | 39.5°C | 8.2°C | 0 mm | 42% | 1.6 m/s | 4.1 |
| 2023 | 28.0°C | 21.4°C | 14.8°C | 35.4°C | 9.1°C | 2 mm | 49% | 2.1 m/s | 4.5 |
| 2022 | 27.6°C | 21.2°C | 14.8°C | 32.9°C | 8.6°C | 13 mm | 57% | 1.7 m/s | 3.8 |
| 2021 | 24.5°C | 18.4°C | 12.3°C | 32.8°C | 6.9°C | 21 mm | 58% | 2.2 m/s | 4.5 |
| 2020 | 29.5°C | 22.7°C | 16.0°C | 38.2°C | 8.0°C | 2 mm | 46% | 1.8 m/s | 4.4 |
| 2019 | 27.0°C | 19.8°C | 12.7°C | 32.8°C | 6.6°C | 1 mm | 41% | 2.3 m/s | 5.2 |
| 2018 | 26.1°C | 20.1°C | 14.1°C | 32.5°C | 9.1°C | 16 mm | 56% | 1.9 m/s | 4.4 |
| 2017 | 28.8°C | 21.6°C | 14.4°C | 35.8°C | 9.7°C | 1 mm | 46% | 2 m/s | 4.6 |
| 2016 | 27.0°C | 20.6°C | 14.2°C | 32.7°C | 10.7°C | 4 mm | 55% | 2.1 m/s | 4.4 |
| 2015 | 27.9°C | 22.2°C | 16.5°C | 33.2°C | 11.7°C | 17 mm | 60% | 1.9 m/s | 4.4 |
| 2014 | 29.3°C | 22.5°C | 15.8°C | 36.1°C | 11.4°C | 1 mm | 50% | 1.7 m/s | 4.6 |
| 2013 | 24.6°C | 18.1°C | 11.6°C | 30.6°C | 8.6°C | 27 mm | 54% | 2.1 m/s | 4.4 |
| 2012 | 27.2°C | 20.9°C | 14.5°C | 38.4°C | 9.8°C | 6 mm | 52% | 2.2 m/s | 4.6 |
| 2011 | 27.4°C | 20.5°C | 13.7°C | 35.0°C | 8.8°C | 16 mm | 47% | 1.8 m/s | 4.1 |
| 2010 | 24.2°C | 18.5°C | 12.8°C | 33.7°C | 8.0°C | 65 mm | 65% | 2.2 m/s | 3.6 |
| 2009 | 25.3°C | 18.7°C | 12.2°C | 35.1°C | 5.6°C | 2 mm | 51% | 2.3 m/s | 4.6 |
| 2008 | 28.7°C | 21.6°C | 14.6°C | 34.5°C | 5.5°C | 2 mm | 37% | 2.1 m/s | 4.8 |
| 2007 | 25.6°C | 19.0°C | 12.5°C | 31.8°C | 8.6°C | 3 mm | 50% | 2.6 m/s | 4.7 |
| 2006 | 24.3°C | 18.1°C | 11.8°C | 29.6°C | 8.2°C | 9 mm | 58% | 2.2 m/s | 4.4 |
| 2005 | 25.3°C | 18.8°C | 12.3°C | 32.3°C | 8.2°C | 34 mm | 58% | 2 m/s | 4.3 |
| 2004 🌧️ | 23.7°C | 18.1°C | 12.4°C | 34.3°C | 7.7°C | 157 mm | 64% | 2.3 m/s | 4.1 |
| 2003 🔥 | 29.6°C | 22.9°C | 16.2°C | 36.3°C | 9.1°C | 1 mm | 45% | 1.7 m/s | 3.8 |
| 2002 | 23.7°C | 17.8°C | 11.9°C | 33.5°C | 9.0°C | 1 mm | 63% | 2.1 m/s | 3.5 |
| 2001 | 27.6°C | 20.8°C | 14.0°C | 33.1°C | 11.0°C | 0 mm | 54% | 1.8 m/s | 3.7 |
| 2000 | 23.4°C | 17.8°C | 12.3°C | 30.9°C | 7.7°C | 23 mm | 67% | 2.4 m/s | 4 |
| 1999 | 29.6°C | 22.2°C | 14.7°C | 35.3°C | 10.4°C | 1 mm | 38% | 1.9 m/s | 4.9 |
| 1998 | 25.0°C | 18.6°C | 12.3°C | 30.4°C | 8.5°C | 5 mm | 55% | 2.2 m/s | 4.4 |
| 1997 | 24.6°C | 18.4°C | 12.1°C | 30.7°C | 7.0°C | 6 mm | 58% | 2.4 m/s | 4.5 |
| 1996 | 25.5°C | 18.9°C | 12.3°C | 36.2°C | 5.6°C | 21 mm | 50% | 2.1 m/s | 3.8 |
| 1995 | 28.1°C | 20.8°C | 13.5°C | 33.4°C | 9.8°C | 2 mm | 47% | 1.7 m/s | 4 |
| 1994 | 24.8°C | 18.3°C | 11.9°C | 30.4°C | 8.3°C | 5 mm | 54% | 2.2 m/s | 4.4 |
| 1993 | 26.5°C | 19.8°C | 13.1°C | 35.3°C | 9.9°C | 4 mm | 52% | 2.1 m/s | 4.2 |
| 1992 | 26.2°C | 20.2°C | 14.2°C | 33.6°C | 10.8°C | 25 mm | 59% | 2 m/s | 4.2 |
| 1991 | 28.4°C | 21.8°C | 15.3°C | 35.9°C | 4.3°C | 19 mm | 47% | 2 m/s | 3.9 |
| 1990 | 28.5°C | 21.2°C | 14.0°C | 33.4°C | 10.3°C | 2 mm | 42% | 2 m/s | 4.3 |
| 1989 | 25.1°C | 18.6°C | 12.1°C | 31.7°C | 7.0°C | 12 mm | 54% | 2.2 m/s | 3.9 |
| 1988 | 28.4°C | 21.3°C | 14.2°C | 33.6°C | 10.1°C | 0 mm | 51% | 1.7 m/s | 3.6 |
| 1987 | 26.8°C | 20.8°C | 14.7°C | 36.7°C | 11.1°C | 88 mm | 61% | 1.8 m/s | 3.4 |
| 1986 | 24.4°C | 18.0°C | 11.7°C | 28.8°C | 8.4°C | 33 mm | 56% | 1.9 m/s | 4.1 |
| 1985 | 26.0°C | 19.5°C | 12.9°C | 33.5°C | 9.5°C | 12 mm | 53% | 2 m/s | 4.2 |
| 1984 | 23.9°C | 17.5°C | 11.1°C | 31.4°C | 6.6°C | 8 mm | 55% | 2.5 m/s | 4.3 |
| 1983 | 25.9°C | 19.8°C | 13.8°C | 31.6°C | 10.8°C | 13 mm | 61% | 2.2 m/s | — |
| 1982 | 26.0°C | 19.1°C | 12.2°C | 30.0°C | 7.4°C | 5 mm | 42% | 2.1 m/s | — |
| 1981 ❄️ | 23.6°C | 17.3°C | 10.9°C | 30.4°C | 6.1°C | 8 mm | 52% | 2.7 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 26.5°C with lows near 13.4°C (mean 20°C), based on 45 years of NASA POWER data.
October averages 16 mm of rainfall in San Diego, one of the drier months. The wettest on record was 157 mm in 2004.
The hottest October reached 39.5°C in 2024. The coldest dipped to 4.3°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 2.2°C. Daytime highs moved from 25.1°C to 27.4°C and overnight lows from 12.2°C to 14.2°C over the same span.
October is one of the warmer months of the year in San Diego and one of the drier months, so plan for around 26.5°C daytime highs and 13.4°C at night.
Not quite — October is the 8th coolest month in San Diego, averaging 20°C.
For October in San Diego, pack light layers you can adjust through the day, with typical highs of 26.5°C and lows of 13.4°C.
Relative humidity in October averages 53% — relatively dry.
Average wind speed in October is 2.1 m/s. The windiest October on record averaged 2.7 m/s (1981).
The wettest October on record was 2004 with 157 mm. On average, October sees 16 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in San Diego behaves each October, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for October specifically, along with year-by-year records and how the month has changed over the decades.
