October is one of the warmer months of the year in Santa Ana, with average highs near 22.1°C and lows around 17.4°C (mean 19.8°C). It is one of the drier months, averaging 13 mm of rainfall and 71% relative humidity across the period.
October is one of the warmer months of the year in Santa Ana. Across 45 years of records, the warmest October in Santa Ana was 2015 — when the month averaged 23.2°C — while the coldest was 2002 at 17.3°C. Typical October days reach 22.1°C with nights near 17.4°C. The long-term October temperature trend is broadly flat.
October is one of the drier months in Santa Ana, averaging 13 mm of rainfall. The wettest October on record was 2004 with 119 mm, while the driest were 1988 and 1990 at 0 mm.
Relative humidity in Santa Ana during October averages 71%. The most humid October was 2025 at 79%, and the least humid was 1982 at 60%.
October receives about 4.5 kWh/m²/day of solar energy in Santa Ana. The sunniest October was 2019 at 5.3 kWh/m²/day, and the cloudiest was 2010 at 3.8.
Average wind speed in Santa Ana during October is 2.4 m/s. The windiest October was 1984 at 3.4 m/s, while the calmest was 2003 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.8°C | 19.8°C | 18.9°C | 20.3°C | 20.1°C | +0.3°C |
| Avg High | 22.4°C | 22.2°C | 21.1°C | 22.6°C | 22.3°C | -0.1°C |
| Avg Low | 17.3°C | 17.4°C | 16.7°C | 18.0°C | 18.0°C | +0.7°C |
| Avg Rain | 14 mm | 7 mm | 21 mm | 12 mm | 8 mm | -6 mm |
October temperatures in Santa Ana have stayed relatively stable across the record.
October has ranged from a record low of 12°C (1991) to a record high of 35.7°C (2017).
Rainfall in October is one of the drier months, averaging 13 mm, with a wettest year of 119 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
One of the best times to visit Santa Ana
October is one of the best times to visit Santa Ana. Expect days averaging 22.1°C and nights around 17.4°C (mean 19.8°C) — warmer than Santa Ana's yearly average — with low rainfall (13 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 | 21.6°C | 19.6°C | 17.6°C | 28.7°C | 15.4°C | 24 mm | 79% | 2.4 m/s | 4.7 |
| 2024 | 21.9°C | 19.8°C | 17.6°C | 24.4°C | 15.2°C | 0 mm | 75% | 2.1 m/s | 4.6 |
| 2023 | 22.8°C | 20.6°C | 18.4°C | 27.1°C | 16.1°C | 1 mm | 73% | 2.5 m/s | 4.8 |
| 2022 | 21.7°C | 19.8°C | 18.0°C | 30.2°C | 15.9°C | 6 mm | 77% | 2 m/s | 4.3 |
| 2021 | 21.4°C | 19.1°C | 16.7°C | 28.0°C | 13.7°C | 19 mm | 72% | 2.5 m/s | 4.6 |
| 2020 | 24.1°C | 21.8°C | 19.5°C | 29.8°C | 16.0°C | 0 mm | 71% | 2 m/s | 4.8 |
| 2019 | 23.2°C | 20.4°C | 17.7°C | 31.7°C | 15.5°C | 0 mm | 65% | 2.3 m/s | 5.3 |
| 2018 | 22.4°C | 20.3°C | 18.2°C | 27.8°C | 16.3°C | 19 mm | 74% | 2.3 m/s | 4.7 |
| 2017 | 24.2°C | 21.5°C | 18.7°C | 35.7°C | 15.6°C | 1 mm | 66% | 2.2 m/s | 4.9 |
| 2016 | 22.3°C | 20.2°C | 18.1°C | 30.1°C | 15.5°C | 12 mm | 74% | 2.3 m/s | 4.5 |
| 2015 🔥 | 25.5°C | 23.2°C | 21.0°C | 32.1°C | 18.2°C | 9 mm | 73% | 2.4 m/s | 4.5 |
| 2014 | 23.9°C | 21.6°C | 19.3°C | 32.6°C | 17.2°C | 3 mm | 72% | 2 m/s | 4.9 |
| 2013 | 20.8°C | 18.6°C | 16.4°C | 28.5°C | 14.3°C | 7 mm | 71% | 2.3 m/s | 4.7 |
| 2012 | 22.9°C | 20.6°C | 18.3°C | 29.0°C | 15.7°C | 6 mm | 70% | 2.4 m/s | 4.8 |
| 2011 | 20.7°C | 18.4°C | 16.2°C | 30.4°C | 13.6°C | 21 mm | 73% | 2.3 m/s | 4.5 |
| 2010 | 20.3°C | 18.3°C | 16.4°C | 26.2°C | 14.5°C | 43 mm | 77% | 2.5 m/s | 3.8 |
| 2009 | 21.6°C | 19.2°C | 16.8°C | 28.9°C | 13.3°C | 18 mm | 68% | 2.7 m/s | 4.7 |
| 2008 | 23.5°C | 20.6°C | 17.8°C | 31.5°C | 14.0°C | 1 mm | 63% | 2.3 m/s | 5 |
| 2007 | 21.9°C | 19.4°C | 16.9°C | 28.7°C | 14.5°C | 8 mm | 67% | 2.6 m/s | 4.8 |
| 2006 | 20.9°C | 18.6°C | 16.4°C | 26.3°C | 14.4°C | 2 mm | 71% | 2.3 m/s | 4.6 |
| 2005 | 21.1°C | 18.7°C | 16.4°C | 30.5°C | 14.2°C | 27 mm | 72% | 2.2 m/s | 4.4 |
| 2004 🌧️ | 20.1°C | 18.2°C | 16.3°C | 24.9°C | 14.5°C | 119 mm | 78% | 2.6 m/s | 4.4 |
| 2003 | 22.1°C | 19.8°C | 17.5°C | 30.9°C | 14.5°C | 3 mm | 72% | 1.9 m/s | 4.5 |
| 2002 ❄️ | 19.0°C | 17.3°C | 15.5°C | 26.4°C | 13.9°C | 1 mm | 78% | 2.2 m/s | 4 |
| 2001 | 20.6°C | 18.6°C | 16.6°C | 25.6°C | 14.7°C | 1 mm | 78% | 2 m/s | 4.4 |
| 2000 | 19.9°C | 18.1°C | 16.4°C | 23.2°C | 14.3°C | 29 mm | 77% | 2.8 m/s | 4 |
| 1999 | 23.5°C | 20.7°C | 17.9°C | 28.5°C | 15.3°C | 1 mm | 64% | 2.2 m/s | 5.1 |
| 1998 | 21.4°C | 19.2°C | 17.1°C | 27.4°C | 14.8°C | 1 mm | 69% | 2.4 m/s | 4.7 |
| 1997 | 22.8°C | 20.5°C | 18.1°C | 30.2°C | 16.0°C | 1 mm | 66% | 2.8 m/s | 4.7 |
| 1996 | 20.8°C | 18.4°C | 16.1°C | 26.6°C | 12.9°C | 29 mm | 69% | 2.8 m/s | 4.4 |
| 1995 | 21.8°C | 19.6°C | 17.4°C | 27.2°C | 15.7°C | 1 mm | 72% | 2 m/s | 4.5 |
| 1994 | 21.3°C | 19.0°C | 16.7°C | 30.9°C | 14.2°C | 9 mm | 68% | 2.6 m/s | 4.6 |
| 1993 | 22.4°C | 19.9°C | 17.5°C | 28.7°C | 15.5°C | 4 mm | 70% | 2.3 m/s | 4.4 |
| 1992 | 22.3°C | 20.1°C | 17.9°C | 27.5°C | 15.7°C | 22 mm | 75% | 2.4 m/s | 4.2 |
| 1991 | 22.4°C | 19.9°C | 17.5°C | 30.9°C | 12.0°C | 7 mm | 68% | 2.5 m/s | 4.5 |
| 1990 | 23.7°C | 20.9°C | 18.1°C | 30.9°C | 16.5°C | 0 mm | 64% | 2.2 m/s | 4.7 |
| 1989 | 21.5°C | 19.0°C | 16.5°C | 27.3°C | 13.1°C | 13 mm | 71% | 2.5 m/s | 4.5 |
| 1988 | 21.8°C | 19.4°C | 17.1°C | 28.8°C | 14.6°C | 0 mm | 72% | 2 m/s | 4.4 |
| 1987 | 22.6°C | 20.4°C | 18.2°C | 30.7°C | 16.6°C | 63 mm | 76% | 2.1 m/s | 3.9 |
| 1986 | 22.2°C | 19.6°C | 17.0°C | 27.7°C | 15.0°C | 7 mm | 66% | 2.4 m/s | 4.3 |
| 1985 | 22.6°C | 20.1°C | 17.5°C | 30.4°C | 14.6°C | 6 mm | 65% | 2.6 m/s | 4.5 |
| 1984 | 22.4°C | 19.7°C | 17.0°C | 26.3°C | 14.3°C | 7 mm | 62% | 3.4 m/s | 4.4 |
| 1983 | 23.5°C | 21.1°C | 18.7°C | 28.9°C | 17.5°C | 20 mm | 70% | 2.6 m/s | — |
| 1982 | 23.6°C | 20.6°C | 17.6°C | 27.0°C | 14.1°C | 7 mm | 60% | 2.7 m/s | — |
| 1981 | 21.4°C | 18.7°C | 15.9°C | 28.4°C | 13.1°C | 4 mm | 64% | 3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 22.1°C with lows near 17.4°C (mean 19.8°C), based on 45 years of NASA POWER data.
October averages 13 mm of rainfall in Santa Ana, one of the drier months. The wettest on record was 119 mm in 2004.
The hottest October reached 35.7°C in 2017. The coldest dipped to 12°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have fallen by about 0.2°C — but days and nights have moved in opposite directions. Overnight lows rose from 17.3°C to 17.7°C while daytime highs eased from 22.7°C to 21.9°C, narrowing the gap between day and night.
October is one of the warmer months of the year in Santa Ana and one of the drier months, so plan for around 22.1°C daytime highs and 17.4°C at night.
Not quite — October is the 9th coolest month in Santa Ana, averaging 19.8°C.
For October in Santa Ana, pack light layers you can adjust through the day, with typical highs of 22.1°C and lows of 17.4°C.
Relative humidity in October averages 71% — moderately humid.
Average wind speed in October is 2.4 m/s. The windiest October on record averaged 3.4 m/s (1984).
The wettest October on record was 2004 with 119 mm. On average, October sees 13 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 Santa Ana 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.
