October is one of the warmer months of the year in Irvine, with average highs near 11.3°C and lows around 6.8°C (mean 9.1°C). It is a relatively wet time of year, averaging 133 mm of rainfall and 91% relative humidity across the period.
October is one of the warmer months of the year in Irvine. Across 45 years of records, the warmest October in Irvine was 2001 — when the month averaged 11.2°C — while the coldest was 1981 at 5.9°C. Typical October days reach 11.3°C with nights near 6.8°C. The long-term trend is warming, about 0.4°C per decade.
October is a relatively wet time of year in Irvine, averaging 133 mm of rainfall. The wettest October on record was 2011 with 211 mm, while the driest was 2016 at 39 mm.
Relative humidity in Irvine during October averages 91%. The most humid Octobers were 2001, 2011 and 2017 at 92%, and the least humid was 1983 at 88%.
October receives about 1.4 kWh/m²/day of solar energy in Irvine. The sunniest Octobers were 2010 and 2016 at 1.7 kWh/m²/day, and the cloudiest was 2000 at 1.
Average wind speed in Irvine during October is 4.2 m/s. The windiest October was 1983 at 5.7 m/s, while the calmest was 1993 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.5°C | 8.6°C | 9.3°C | 9.1°C | 10.0°C | +1.5°C |
| Avg High | 10.7°C | 11.0°C | 11.6°C | 11.5°C | 12.1°C | +1.4°C |
| Avg Low | 6.3°C | 6.3°C | 7.1°C | 6.7°C | 7.8°C | +1.5°C |
| Avg Rain | 139 mm | 129 mm | 141 mm | 121 mm | 134 mm | -6 mm |
October temperatures in Irvine have risen by about 1.9°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -1.2°C (2012) to a record high of 18.3°C (1985).
Rainfall in October is a relatively wet time of year, averaging 133 mm, with a wettest year of 211 mm.
A good time to visit Irvine
October is a good time to visit Irvine, with days averaging 11.3°C and nights around 6.8°C (mean 9.1°C, close to Irvine's yearly average) and higher rainfall. July and August are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 11.8°C | 9.9°C | 8.0°C | 15.8°C | 3.0°C | 109 mm | 91% | 4.1 m/s | 1.2 |
| 2024 | 12.4°C | 10.0°C | 7.6°C | 15.0°C | 2.0°C | 76 mm | 91% | 4.2 m/s | 1.4 |
| 2023 | 12.0°C | 9.7°C | 7.4°C | 16.8°C | 2.1°C | 96 mm | 91% | 4.4 m/s | 1.4 |
| 2022 | 12.9°C | 10.9°C | 8.8°C | 14.6°C | 5.1°C | 178 mm | 91% | 4.8 m/s | 1.3 |
| 2021 | 12.6°C | 10.5°C | 8.3°C | 16.6°C | 2.7°C | 174 mm | 91% | 4.2 m/s | 1.3 |
| 2020 | 11.1°C | 8.9°C | 6.6°C | 14.0°C | 3.6°C | 170 mm | 91% | 4 m/s | 1.5 |
| 2019 | 10.4°C | 8.0°C | 5.6°C | 14.0°C | 1.4°C | 106 mm | 91% | 4 m/s | 1.6 |
| 2018 | 11.2°C | 8.7°C | 6.2°C | 18.0°C | -1.1°C | 99 mm | 90% | 4.3 m/s | 1.4 |
| 2017 | 12.3°C | 10.3°C | 8.2°C | 15.8°C | 2.4°C | 133 mm | 92% | 4.8 m/s | 1.2 |
| 2016 | 11.8°C | 9.0°C | 6.2°C | 15.2°C | 3.7°C | 39 mm | 92% | 3.3 m/s | 1.7 |
| 2015 | 12.3°C | 9.5°C | 6.6°C | 16.1°C | 3.8°C | 69 mm | 91% | 3.2 m/s | 1.6 |
| 2014 | 12.2°C | 9.8°C | 7.4°C | 15.7°C | 4.0°C | 170 mm | 91% | 4.7 m/s | 1.4 |
| 2013 | 12.4°C | 10.2°C | 8.1°C | 15.7°C | 2.5°C | 150 mm | 92% | 4.5 m/s | 1.3 |
| 2012 | 9.4°C | 7.0°C | 4.6°C | 12.5°C | -1.2°C | 128 mm | 92% | 3.1 m/s | 1.6 |
| 2011 🌧️ | 11.8°C | 10.0°C | 8.2°C | 15.7°C | 3.3°C | 211 mm | 92% | 4.8 m/s | 1.1 |
| 2010 | 11.6°C | 8.9°C | 6.2°C | 17.6°C | 0.5°C | 106 mm | 91% | 4.1 m/s | 1.7 |
| 2009 | 12.1°C | 9.7°C | 7.4°C | 14.8°C | 3.8°C | 113 mm | 91% | 3.8 m/s | 1.4 |
| 2008 | 10.3°C | 8.0°C | 5.7°C | 15.3°C | 0.5°C | 187 mm | 91% | 4.9 m/s | 1.5 |
| 2007 | 12.7°C | 10.3°C | 7.8°C | 16.0°C | 4.5°C | 74 mm | 92% | 3.4 m/s | 1.5 |
| 2006 | 13.2°C | 10.9°C | 8.6°C | 15.7°C | 3.4°C | 147 mm | 92% | 3.7 m/s | 1.4 |
| 2005 | 12.6°C | 10.3°C | 8.1°C | 16.0°C | 3.7°C | 182 mm | 92% | 4.5 m/s | 1.2 |
| 2004 | 10.8°C | 8.7°C | 6.6°C | 14.0°C | 2.9°C | 154 mm | 92% | 3.9 m/s | 1.4 |
| 2003 | 10.5°C | 7.8°C | 5.2°C | 15.8°C | 1.2°C | 46 mm | 90% | 3.8 m/s | 1.6 |
| 2002 | 9.8°C | 7.6°C | 5.5°C | 17.3°C | 0.1°C | 182 mm | 92% | 3.7 m/s | 1.4 |
| 2001 🔥 | 13.1°C | 11.2°C | 9.3°C | 15.4°C | 6.2°C | 156 mm | 92% | 5 m/s | 1.2 |
| 2000 | 10.8°C | 8.6°C | 6.3°C | 16.0°C | 1.7°C | 167 mm | 91% | 4.5 m/s | 1 |
| 1999 | 11.4°C | 9.1°C | 6.8°C | 14.3°C | 3.0°C | 59 mm | 90% | 4.4 m/s | 1.3 |
| 1998 | 10.7°C | 8.4°C | 6.1°C | 15.6°C | 1.2°C | 201 mm | 89% | 5 m/s | 1.5 |
| 1997 | 11.5°C | 8.8°C | 6.1°C | 16.3°C | 0.0°C | 86 mm | 91% | 3.4 m/s | 1.6 |
| 1996 | 11.8°C | 9.8°C | 7.8°C | 15.7°C | 4.1°C | 181 mm | 92% | 5 m/s | 1.3 |
| 1995 | 13.2°C | 11.1°C | 9.0°C | 16.3°C | 4.9°C | 206 mm | 91% | 5.2 m/s | 1.4 |
| 1994 | 11.0°C | 8.6°C | 6.2°C | 15.5°C | 0.9°C | 101 mm | 91% | 3.8 m/s | 1.3 |
| 1993 | 9.1°C | 6.2°C | 3.4°C | 13.2°C | -1.1°C | 63 mm | 90% | 2.8 m/s | 1.5 |
| 1992 | 8.6°C | 6.0°C | 3.5°C | 13.5°C | 0.2°C | 85 mm | 91% | 3.1 m/s | 1.4 |
| 1991 | 10.7°C | 8.5°C | 6.3°C | 16.9°C | 1.8°C | 114 mm | 90% | 4.3 m/s | 1.4 |
| 1990 | 11.5°C | 9.5°C | 7.6°C | 16.7°C | 2.4°C | 197 mm | 92% | 4.8 m/s | 1.2 |
| 1989 | 11.9°C | 9.7°C | 7.6°C | 15.2°C | 4.4°C | 132 mm | 91% | 4.5 m/s | 1.3 |
| 1988 | 11.1°C | 8.8°C | 6.5°C | 15.9°C | -1.0°C | 129 mm | 91% | 4.2 m/s | 1.1 |
| 1987 | 10.0°C | 7.7°C | 5.4°C | 14.5°C | 1.6°C | 135 mm | 91% | 3.6 m/s | 1.4 |
| 1986 | 11.0°C | 8.8°C | 6.7°C | 14.5°C | 3.6°C | 128 mm | 91% | 4.8 m/s | 1.4 |
| 1985 | 11.5°C | 9.5°C | 7.4°C | 18.3°C | 1.1°C | 64 mm | 92% | 3.4 m/s | 1.4 |
| 1984 | 11.3°C | 9.0°C | 6.8°C | 14.4°C | 3.6°C | 171 mm | 91% | 4.4 m/s | 1.2 |
| 1983 | 10.7°C | 8.6°C | 6.4°C | 15.9°C | 0.7°C | 175 mm | 88% | 5.7 m/s | — |
| 1982 | 10.8°C | 8.6°C | 6.4°C | 13.8°C | 3.0°C | 151 mm | 91% | 4.5 m/s | — |
| 1981 ❄️ | 8.2°C | 5.9°C | 3.5°C | 12.7°C | 0.9°C | 170 mm | 90% | 4.1 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 11.3°C with lows near 6.8°C (mean 9.1°C), based on 45 years of NASA POWER data.
October averages 133 mm of rainfall in Irvine, a relatively wet time of year. The wettest on record was 211 mm in 2011.
The hottest October reached 18.3°C in 1985. The coldest dipped to -1.2°C in 2012.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1.9°C. Daytime highs moved from 10.5°C to 12.3°C and overnight lows from 6.1°C to 8°C over the same span.
October is one of the warmer months of the year in Irvine and a relatively wet time of year, so plan for around 11.3°C daytime highs and 6.8°C at night.
Not quite — October is the 7th coolest month in Irvine, averaging 9.1°C.
For October in Irvine, pack warm layers and a jacket for chilly mornings, with typical highs of 11.3°C and lows of 6.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 91% — quite humid.
Average wind speed in October is 4.2 m/s. The windiest October on record averaged 5.7 m/s (1983).
The wettest October on record was 2011 with 211 mm. On average, October sees 133 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 Irvine 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.
