October is one of the warmer months of the year in Santa Rosa, with average highs near 25.2°C and lows around 10.4°C (mean 17.8°C). It is one of the drier months, averaging 39 mm of rainfall and 55% relative humidity across the period.
October is one of the warmer months of the year in Santa Rosa. Across 45 years of records, the warmest October in Santa Rosa was 2020 — when the month averaged 21.3°C — while the coldest was 1984 at 14.9°C. Typical October days reach 25.2°C with nights near 10.4°C. The long-term trend is warming, about 0.3°C per decade.
October is one of the drier months in Santa Rosa, averaging 39 mm of rainfall. The wettest October on record was 2021 with 209 mm, while the driest were 2020 and 2022 at 0 mm.
Relative humidity in Santa Rosa during October averages 55%. The most humid October was 2016 at 70%, and the least humid was 2020 at 36%.
October receives about 4.1 kWh/m²/day of solar energy in Santa Rosa. The sunniest October was 2019 at 4.7 kWh/m²/day, and the cloudiest was 2016 at 3.5.
Average wind speed in Santa Rosa during October is 1.5 m/s. The windiest October was 2019 at 1.8 m/s, while the calmest was 1987 at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.1°C | 18.1°C | 17.4°C | 18.0°C | 18.8°C | +1.7°C |
| Avg High | 24.3°C | 25.7°C | 24.6°C | 25.3°C | 26.2°C | +1.9°C |
| Avg Low | 9.7°C | 10.5°C | 10.1°C | 10.7°C | 11.3°C | +1.6°C |
| Avg Rain | 45 mm | 30 mm | 41 mm | 36 mm | 46 mm | +0 mm |
October temperatures in Santa Rosa have risen by about 2°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 2.4°C (1984) to a record high of 40.8°C (2024).
Rainfall in October is one of the drier months, averaging 39 mm, with a wettest year of 209 mm.
A good time to visit Santa Rosa
October is a good time to visit Santa Rosa, with days averaging 25.2°C and nights around 10.4°C (mean 17.8°C, warmer than Santa Rosa's yearly average) and moderate rainfall. September and July 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 | 23.3°C | 16.7°C | 10.2°C | 32.2°C | 8.0°C | 42 mm | 70% | 1.4 m/s | 3.7 |
| 2024 | 28.7°C | 20.7°C | 12.8°C | 40.8°C | 6.3°C | 7 mm | 48% | 1.6 m/s | 4.3 |
| 2023 | 26.0°C | 18.4°C | 10.8°C | 35.6°C | 3.3°C | 17 mm | 56% | 1.5 m/s | 4.2 |
| 2022 | 27.4°C | 19.3°C | 11.1°C | 34.1°C | 6.7°C | 0 mm | 51% | 1.3 m/s | 4.3 |
| 2021 🌧️ | 22.2°C | 16.1°C | 10.1°C | 34.2°C | 6.5°C | 209 mm | 63% | 1.7 m/s | 3.8 |
| 2020 🔥 | 29.6°C | 21.3°C | 12.9°C | 37.2°C | 7.5°C | 0 mm | 36% | 1.7 m/s | 4.3 |
| 2019 | 25.7°C | 17.6°C | 9.5°C | 32.4°C | 3.4°C | 0 mm | 36% | 1.8 m/s | 4.7 |
| 2018 | 26.0°C | 18.3°C | 10.7°C | 29.6°C | 8.6°C | 18 mm | 54% | 1.6 m/s | 4.3 |
| 2017 | 26.6°C | 18.6°C | 10.6°C | 32.6°C | 6.2°C | 8 mm | 41% | 1.7 m/s | 4.5 |
| 2016 | 22.1°C | 16.2°C | 10.2°C | 31.9°C | 7.8°C | 125 mm | 70% | 1.7 m/s | 3.5 |
| 2015 | 28.3°C | 20.8°C | 13.3°C | 35.8°C | 10.5°C | 4 mm | 54% | 1.4 m/s | 4.3 |
| 2014 | 26.6°C | 19.3°C | 12.1°C | 36.3°C | 7.0°C | 25 mm | 58% | 1.4 m/s | 4.2 |
| 2013 | 25.2°C | 17.1°C | 8.9°C | 29.4°C | 6.1°C | 1 mm | 42% | 1.4 m/s | 4.6 |
| 2012 | 25.1°C | 18.0°C | 10.8°C | 39.2°C | 6.7°C | 40 mm | 62% | 1.6 m/s | 4.2 |
| 2011 | 24.4°C | 17.4°C | 10.3°C | 31.6°C | 5.4°C | 46 mm | 64% | 1.4 m/s | 4 |
| 2010 | 23.3°C | 17.1°C | 10.8°C | 34.1°C | 2.9°C | 91 mm | 64% | 1.5 m/s | 3.6 |
| 2009 | 22.8°C | 16.2°C | 9.6°C | 29.1°C | 5.3°C | 104 mm | 64% | 1.7 m/s | 4 |
| 2008 | 25.3°C | 17.9°C | 10.5°C | 30.8°C | 5.5°C | 33 mm | 48% | 1.7 m/s | 4.2 |
| 2007 | 21.8°C | 15.2°C | 8.6°C | 29.5°C | 6.1°C | 58 mm | 67% | 1.5 m/s | 3.9 |
| 2006 | 24.2°C | 16.8°C | 9.4°C | 29.8°C | 6.8°C | 7 mm | 51% | 1.4 m/s | 4.1 |
| 2005 | 24.7°C | 17.4°C | 10.1°C | 30.9°C | 6.1°C | 16 mm | 57% | 1.5 m/s | 4.3 |
| 2004 | 23.7°C | 16.7°C | 9.7°C | 34.7°C | 4.0°C | 88 mm | 63% | 1.6 m/s | 4 |
| 2003 | 28.5°C | 20.3°C | 12.1°C | 33.8°C | 5.4°C | 2 mm | 45% | 1.6 m/s | 4.6 |
| 2002 | 25.7°C | 17.8°C | 9.9°C | 35.0°C | 3.9°C | 0 mm | 48% | 1.5 m/s | 4.3 |
| 2001 | 26.2°C | 19.1°C | 11.9°C | 38.6°C | 8.9°C | 22 mm | 52% | 1.5 m/s | 4 |
| 2000 | 23.3°C | 16.5°C | 9.6°C | 34.4°C | 4.9°C | 77 mm | 63% | 1.6 m/s | 3.8 |
| 1999 | 27.4°C | 19.1°C | 10.9°C | 33.5°C | 6.1°C | 17 mm | 45% | 1.5 m/s | 4.3 |
| 1998 | 23.7°C | 16.4°C | 9.1°C | 29.8°C | 4.4°C | 23 mm | 52% | 1.7 m/s | 4.2 |
| 1997 | 23.9°C | 16.4°C | 8.9°C | 30.2°C | 5.2°C | 31 mm | 60% | 1.6 m/s | 4.3 |
| 1996 | 24.8°C | 17.4°C | 10.1°C | 39.1°C | 4.6°C | 33 mm | 53% | 1.7 m/s | 4.2 |
| 1995 | 26.9°C | 19.3°C | 11.7°C | 33.5°C | 6.7°C | 3 mm | 42% | 1.6 m/s | 4.3 |
| 1994 | 24.6°C | 16.9°C | 9.1°C | 32.6°C | 5.6°C | 20 mm | 54% | 1.5 m/s | 4.5 |
| 1993 | 25.0°C | 18.0°C | 11.0°C | 35.3°C | 7.0°C | 34 mm | 59% | 1.3 m/s | 3.9 |
| 1992 | 25.9°C | 18.9°C | 11.8°C | 34.2°C | 9.0°C | 77 mm | 59% | 1.4 m/s | 4 |
| 1991 | 27.8°C | 20.1°C | 12.3°C | 36.8°C | 2.8°C | 47 mm | 43% | 1.6 m/s | 4.3 |
| 1990 | 26.8°C | 18.6°C | 10.4°C | 33.8°C | 5.9°C | 12 mm | 44% | 1.7 m/s | 4.5 |
| 1989 | 23.1°C | 15.9°C | 8.8°C | 29.4°C | 2.9°C | 70 mm | 63% | 1.5 m/s | 4.2 |
| 1988 | 27.3°C | 19.4°C | 11.4°C | 34.5°C | 8.2°C | 6 mm | 50% | 1.3 m/s | 4 |
| 1987 | 27.4°C | 19.9°C | 12.4°C | 37.0°C | 8.8°C | 35 mm | 50% | 1.2 m/s | 3.9 |
| 1986 | 24.7°C | 17.2°C | 9.6°C | 31.4°C | 6.0°C | 10 mm | 55% | 1.5 m/s | 4.2 |
| 1985 | 24.4°C | 16.8°C | 9.2°C | 34.8°C | 4.9°C | 30 mm | 53% | 1.6 m/s | 4.1 |
| 1984 ❄️ | 21.7°C | 14.9°C | 8.0°C | 29.1°C | 2.4°C | 54 mm | 67% | 1.7 m/s | 3.6 |
| 1983 | 25.4°C | 18.3°C | 11.2°C | 29.9°C | 8.3°C | 27 mm | 56% | 1.3 m/s | — |
| 1982 | 22.8°C | 16.1°C | 9.3°C | 28.8°C | 4.4°C | 97 mm | 59% | 1.5 m/s | — |
| 1981 | 22.2°C | 15.0°C | 7.8°C | 31.1°C | 4.1°C | 79 mm | 64% | 1.5 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 25.2°C with lows near 10.4°C (mean 17.8°C), based on 45 years of NASA POWER data.
October averages 39 mm of rainfall in Santa Rosa, one of the drier months. The wettest on record was 209 mm in 2021.
The hottest October reached 40.8°C in 2024. The coldest dipped to 2.4°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 2°C. Daytime highs moved from 23.3°C to 25.5°C and overnight lows from 9.1°C to 11°C over the same span.
October is one of the warmer months of the year in Santa Rosa and one of the drier months, so plan for around 25.2°C daytime highs and 10.4°C at night.
Not quite — October is the 8th coolest month in Santa Rosa, averaging 17.8°C.
For October in Santa Rosa, pack light layers you can adjust through the day, with typical highs of 25.2°C and lows of 10.4°C.
Relative humidity in October averages 55% — relatively dry.
Average wind speed in October is 1.5 m/s. The windiest October on record averaged 1.8 m/s (2019).
The wettest October on record was 2021 with 209 mm. On average, October sees 39 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 Rosa 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.
