October is one of the warmer months of the year in Irvine, with average highs near 25.4°C and lows around 15.7°C (mean 20.5°C). It is one of the drier months, averaging 14 mm of rainfall and 59% 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 2015 — when the month averaged 23.3°C — while the coldest was 2002 at 18°C. Typical October days reach 25.4°C with nights near 15.7°C. The long-term trend is warming, about 0.3°C per decade.
October is one of the drier months in Irvine, averaging 14 mm of rainfall. The wettest October on record was 2004 with 134 mm, while the driest was 1988 at 0 mm.
Relative humidity in Irvine during October averages 59%. The most humid October was 2000 at 71%, and the least humid was 2008 at 46%.
October receives about 4.5 kWh/m²/day of solar energy in Irvine. The sunniest October was 2019 at 5.3 kWh/m²/day, and the cloudiest was 2010 at 3.8.
Average wind speed in Irvine during October is 1.9 m/s. The windiest October was 1984 at 2.4 m/s, while the calmest was 2001 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.1°C | 20.6°C | 19.8°C | 21.1°C | 21.3°C | +1.2°C |
| Avg High | 25.1°C | 25.7°C | 24.5°C | 25.9°C | 26.0°C | +0.9°C |
| Avg Low | 15.0°C | 15.6°C | 15.1°C | 16.3°C | 16.5°C | +1.5°C |
| Avg Rain | 16 mm | 8 mm | 21 mm | 14 mm | 9 mm | -7 mm |
October temperatures in Irvine have risen by about 1°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 7.8°C (1991) to a record high of 38.2°C (1991).
Rainfall in October is one of the drier months, averaging 14 mm, with a wettest year of 134 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Irvine
October is one of the best times to visit Irvine. Expect days averaging 25.4°C and nights around 15.7°C (mean 20.5°C) — warmer than Irvine's yearly average — with low rainfall (14 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 | 25.2°C | 20.5°C | 15.8°C | 32.6°C | 12.3°C | 19 mm | 68% | 1.9 m/s | 4.7 |
| 2024 | 26.8°C | 21.9°C | 17.0°C | 33.2°C | 11.7°C | 1 mm | 56% | 1.7 m/s | 4.6 |
| 2023 | 26.5°C | 21.5°C | 16.6°C | 32.9°C | 12.4°C | 1 mm | 61% | 1.9 m/s | 4.8 |
| 2022 | 25.9°C | 21.3°C | 16.6°C | 32.1°C | 12.4°C | 10 mm | 66% | 1.9 m/s | 4.3 |
| 2021 | 24.1°C | 19.5°C | 14.8°C | 32.6°C | 9.8°C | 20 mm | 62% | 2 m/s | 4.6 |
| 2020 | 27.6°C | 22.9°C | 18.1°C | 34.7°C | 12.0°C | 1 mm | 57% | 1.7 m/s | 4.8 |
| 2019 | 26.7°C | 21.1°C | 15.5°C | 33.8°C | 11.2°C | 0 mm | 50% | 2 m/s | 5.3 |
| 2018 | 25.4°C | 20.9°C | 16.3°C | 30.6°C | 14.1°C | 20 mm | 62% | 1.9 m/s | 4.7 |
| 2017 | 27.9°C | 22.5°C | 17.1°C | 38.1°C | 13.3°C | 1 mm | 53% | 1.9 m/s | 4.9 |
| 2016 | 25.5°C | 20.9°C | 16.4°C | 33.3°C | 13.5°C | 10 mm | 63% | 1.7 m/s | 4.5 |
| 2015 🔥 | 27.7°C | 23.3°C | 18.9°C | 36.3°C | 15.3°C | 14 mm | 65% | 2 m/s | 4.5 |
| 2014 | 27.6°C | 22.7°C | 17.8°C | 34.9°C | 14.6°C | 2 mm | 59% | 1.7 m/s | 4.9 |
| 2013 | 23.9°C | 19.0°C | 14.1°C | 31.2°C | 10.5°C | 15 mm | 60% | 1.9 m/s | 4.7 |
| 2012 | 25.9°C | 21.3°C | 16.6°C | 34.7°C | 13.0°C | 7 mm | 59% | 1.8 m/s | 4.8 |
| 2011 | 25.0°C | 20.0°C | 15.1°C | 34.7°C | 11.3°C | 20 mm | 58% | 1.8 m/s | 4.5 |
| 2010 | 23.3°C | 19.1°C | 15.0°C | 30.8°C | 11.0°C | 50 mm | 69% | 2.2 m/s | 3.8 |
| 2009 | 24.5°C | 19.6°C | 14.7°C | 32.0°C | 8.8°C | 7 mm | 58% | 2.1 m/s | 4.7 |
| 2008 | 27.5°C | 22.1°C | 16.7°C | 34.0°C | 10.4°C | 1 mm | 46% | 1.9 m/s | 5 |
| 2007 | 25.1°C | 20.1°C | 15.1°C | 33.5°C | 10.9°C | 5 mm | 56% | 2.1 m/s | 4.8 |
| 2006 | 23.7°C | 19.1°C | 14.4°C | 29.8°C | 12.0°C | 4 mm | 62% | 1.9 m/s | 4.6 |
| 2005 | 24.3°C | 19.4°C | 14.6°C | 33.9°C | 12.3°C | 33 mm | 64% | 1.8 m/s | 4.4 |
| 2004 🌧️ | 23.0°C | 18.8°C | 14.6°C | 31.7°C | 10.3°C | 134 mm | 70% | 2.2 m/s | 4.4 |
| 2003 | 27.1°C | 22.1°C | 17.2°C | 33.6°C | 12.2°C | 2 mm | 56% | 1.8 m/s | 4.5 |
| 2002 ❄️ | 22.0°C | 18.0°C | 14.1°C | 31.2°C | 12.1°C | 1 mm | 70% | 1.9 m/s | 4 |
| 2001 | 25.0°C | 20.3°C | 15.6°C | 32.6°C | 13.0°C | 1 mm | 64% | 1.6 m/s | 4.4 |
| 2000 | 22.7°C | 18.6°C | 14.5°C | 28.2°C | 11.2°C | 27 mm | 71% | 2.2 m/s | 4 |
| 1999 | 28.1°C | 22.4°C | 16.7°C | 34.1°C | 13.4°C | 2 mm | 47% | 1.7 m/s | 5.1 |
| 1998 | 24.2°C | 19.6°C | 14.9°C | 30.3°C | 12.1°C | 4 mm | 60% | 1.9 m/s | 4.7 |
| 1997 | 25.1°C | 20.3°C | 15.4°C | 33.5°C | 11.6°C | 4 mm | 60% | 2.3 m/s | 4.7 |
| 1996 | 24.2°C | 19.2°C | 14.2°C | 33.2°C | 9.2°C | 23 mm | 57% | 2.2 m/s | 4.4 |
| 1995 | 25.9°C | 20.8°C | 15.6°C | 32.0°C | 13.2°C | 1 mm | 57% | 1.7 m/s | 4.5 |
| 1994 | 24.1°C | 19.3°C | 14.5°C | 33.0°C | 11.4°C | 8 mm | 59% | 2.1 m/s | 4.6 |
| 1993 | 25.7°C | 20.6°C | 15.6°C | 30.9°C | 12.7°C | 3 mm | 59% | 1.9 m/s | 4.4 |
| 1992 | 25.3°C | 20.7°C | 16.2°C | 33.2°C | 12.8°C | 25 mm | 66% | 1.8 m/s | 4.2 |
| 1991 | 26.4°C | 21.5°C | 16.6°C | 38.2°C | 7.8°C | 12 mm | 56% | 2 m/s | 4.5 |
| 1990 | 27.5°C | 21.9°C | 16.4°C | 33.1°C | 13.9°C | 1 mm | 50% | 1.9 m/s | 4.7 |
| 1989 | 24.4°C | 19.4°C | 14.5°C | 31.1°C | 9.6°C | 11 mm | 59% | 2.1 m/s | 4.5 |
| 1988 | 26.2°C | 21.0°C | 15.8°C | 34.1°C | 12.3°C | 0 mm | 60% | 1.7 m/s | 4.4 |
| 1987 | 26.0°C | 21.4°C | 16.8°C | 38.0°C | 14.4°C | 74 mm | 66% | 1.7 m/s | 3.9 |
| 1986 | 24.5°C | 19.5°C | 14.5°C | 29.3°C | 11.6°C | 14 mm | 58% | 1.8 m/s | 4.3 |
| 1985 | 25.4°C | 20.3°C | 15.3°C | 34.0°C | 12.3°C | 7 mm | 56% | 2 m/s | 4.5 |
| 1984 | 24.3°C | 19.2°C | 14.0°C | 29.9°C | 10.6°C | 7 mm | 55% | 2.4 m/s | 4.4 |
| 1983 | 25.7°C | 21.0°C | 16.2°C | 33.1°C | 13.8°C | 16 mm | 64% | 2 m/s | — |
| 1982 | 26.0°C | 20.5°C | 15.0°C | 30.5°C | 10.3°C | 6 mm | 47% | 2 m/s | — |
| 1981 | 23.6°C | 18.5°C | 13.3°C | 30.5°C | 9.8°C | 7 mm | 55% | 2.3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 25.4°C with lows near 15.7°C (mean 20.5°C), based on 45 years of NASA POWER data.
October averages 14 mm of rainfall in Irvine, one of the drier months. The wettest on record was 134 mm in 2004.
The hottest October reached 38.2°C in 1991. The coldest dipped to 7.8°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1°C. Daytime highs moved from 25°C to 25.7°C and overnight lows from 14.8°C to 16.2°C over the same span.
October is one of the warmer months of the year in Irvine and one of the drier months, so plan for around 25.4°C daytime highs and 15.7°C at night.
Not quite — October is the 9th coolest month in Irvine, averaging 20.5°C.
For October in Irvine, pack light layers you can adjust through the day, with typical highs of 25.4°C and lows of 15.7°C.
Relative humidity in October averages 59% — moderately humid.
Average wind speed in October is 1.9 m/s. The windiest October on record averaged 2.4 m/s (1984).
The wettest October on record was 2004 with 134 mm. On average, October sees 14 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.
