October is one of the warmer months of the year in San Tan Valley, with average highs near 29.9°C and lows around 14.8°C (mean 22.4°C). It is about average for rainfall, averaging 22 mm of rainfall and 35% relative humidity across the period.
October is one of the warmer months of the year in San Tan Valley. Across 45 years of records, the warmest October in San Tan Valley was 2024 — when the month averaged 26.4°C — while the coldest was 1984 at 18.1°C. Typical October days reach 29.9°C with nights near 14.8°C. The long-term trend is warming, about 0.7°C per decade.
October is about average for rainfall in San Tan Valley, averaging 22 mm of rainfall. The wettest October on record was 2000 with 105 mm, while the driest were 2017 and 2019 at 0 mm.
Relative humidity in San Tan Valley during October averages 35%. The most humid October was 1983 at 61%, and the least humid was 2020 at 19%.
October receives about 4.9 kWh/m²/day of solar energy in San Tan Valley. The sunniest October was 2019 at 5.5 kWh/m²/day, and the cloudiest were 2000 and 2018 at 4.3.
Average wind speed in San Tan Valley during October is 2.3 m/s. The windiest Octobers were 1998, 1999 and 2008 at 2.7 m/s, while the calmest was 2014 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.1°C | 22.0°C | 22.1°C | 23.1°C | 23.9°C | +2.8°C |
| Avg High | 28.4°C | 29.9°C | 29.5°C | 30.5°C | 31.6°C | +3.2°C |
| Avg Low | 13.7°C | 14.1°C | 14.7°C | 15.7°C | 16.2°C | +2.5°C |
| Avg Rain | 36 mm | 16 mm | 21 mm | 20 mm | 16 mm | -20 mm |
October temperatures in San Tan Valley have risen by about 3.6°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 1.2°C (1991) to a record high of 42.1°C (2024).
Rainfall in October is about average for rainfall, averaging 22 mm, with a wettest year of 105 mm.
One of the best times to visit San Tan Valley
October is one of the best times to visit San Tan Valley. Expect days averaging 29.9°C and nights around 14.8°C (mean 22.4°C) — warmer than San Tan Valley's yearly average — with low rainfall (22 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 | 30.8°C | 23.5°C | 16.2°C | 37.1°C | 12.1°C | 56 mm | 41% | 2 m/s | 4.8 |
| 2024 🔥 | 34.5°C | 26.4°C | 18.2°C | 42.1°C | 8.1°C | 2 mm | 19% | 2.1 m/s | 5.1 |
| 2023 | 32.6°C | 25.1°C | 17.5°C | 38.8°C | 9.8°C | 3 mm | 27% | 2.2 m/s | 5.3 |
| 2022 | 28.9°C | 22.0°C | 15.2°C | 34.8°C | 6.5°C | 30 mm | 44% | 2.2 m/s | 4.9 |
| 2021 | 29.1°C | 21.5°C | 13.9°C | 34.6°C | 6.9°C | 7 mm | 36% | 2.2 m/s | 5.1 |
| 2020 | 33.5°C | 25.0°C | 16.4°C | 39.9°C | 4.2°C | 1 mm | 19% | 2 m/s | 5.2 |
| 2019 | 29.9°C | 22.0°C | 14.2°C | 35.7°C | 5.1°C | 0 mm | 26% | 2.4 m/s | 5.5 |
| 2018 | 26.8°C | 20.7°C | 14.6°C | 32.1°C | 8.4°C | 79 mm | 56% | 2.5 m/s | 4.3 |
| 2017 | 33.2°C | 25.2°C | 17.3°C | 36.8°C | 13.1°C | 0 mm | 21% | 2.4 m/s | 5.3 |
| 2016 | 33.0°C | 25.5°C | 18.0°C | 35.7°C | 12.8°C | 6 mm | 30% | 2.1 m/s | 5 |
| 2015 | 29.9°C | 23.5°C | 17.1°C | 38.6°C | 9.5°C | 38 mm | 46% | 2.1 m/s | 4.5 |
| 2014 | 31.0°C | 23.8°C | 16.5°C | 35.5°C | 13.3°C | 38 mm | 43% | 1.8 m/s | 4.8 |
| 2013 | 28.9°C | 20.9°C | 12.9°C | 34.6°C | 6.6°C | 3 mm | 26% | 2.3 m/s | 5.4 |
| 2012 | 31.3°C | 23.4°C | 15.6°C | 37.8°C | 10.4°C | 1 mm | 27% | 2 m/s | 5.3 |
| 2011 | 31.3°C | 23.3°C | 15.3°C | 37.5°C | 8.5°C | 10 mm | 26% | 2.1 m/s | 5.1 |
| 2010 | 29.7°C | 22.7°C | 15.7°C | 39.2°C | 10.3°C | 21 mm | 41% | 2.2 m/s | 4.9 |
| 2009 | 28.0°C | 20.5°C | 13.0°C | 36.8°C | 2.6°C | 1 mm | 26% | 2.3 m/s | 5.2 |
| 2008 | 30.8°C | 22.5°C | 14.2°C | 35.4°C | 3.6°C | 8 mm | 27% | 2.7 m/s | 5.2 |
| 2007 | 30.3°C | 22.5°C | 14.6°C | 35.8°C | 9.1°C | 4 mm | 27% | 2.5 m/s | 5.2 |
| 2006 | 27.9°C | 20.7°C | 13.5°C | 35.7°C | 7.7°C | 26 mm | 41% | 2.1 m/s | 4.8 |
| 2005 | 30.2°C | 22.9°C | 15.6°C | 36.9°C | 11.0°C | 10 mm | 36% | 2.3 m/s | 4.9 |
| 2004 | 28.2°C | 20.8°C | 13.5°C | 34.9°C | 5.6°C | 27 mm | 40% | 2.2 m/s | 4.9 |
| 2003 | 33.4°C | 25.7°C | 18.0°C | 39.6°C | 9.4°C | 7 mm | 29% | 2.1 m/s | 4.9 |
| 2002 | 28.4°C | 21.2°C | 14.0°C | 34.0°C | 9.0°C | 6 mm | 32% | 2 m/s | 4.8 |
| 2001 | 31.2°C | 23.7°C | 16.2°C | 34.9°C | 10.5°C | 15 mm | 31% | 2 m/s | 4.8 |
| 2000 🌧️ | 26.9°C | 20.4°C | 14.0°C | 38.2°C | 4.7°C | 105 mm | 50% | 2.3 m/s | 4.3 |
| 1999 | 33.0°C | 24.1°C | 15.1°C | 38.0°C | 7.9°C | 0 mm | 19% | 2.7 m/s | 5.3 |
| 1998 | 29.4°C | 21.6°C | 13.9°C | 37.7°C | 7.0°C | 11 mm | 31% | 2.7 m/s | 4.9 |
| 1997 | 28.8°C | 20.8°C | 12.7°C | 39.8°C | 3.5°C | 20 mm | 33% | 2.6 m/s | 5 |
| 1996 | 28.7°C | 21.0°C | 13.3°C | 38.0°C | 2.7°C | 13 mm | 35% | 2.3 m/s | 4.9 |
| 1995 | 31.4°C | 22.9°C | 14.3°C | 37.2°C | 8.4°C | 1 mm | 26% | 2.1 m/s | 5.2 |
| 1994 | 27.6°C | 20.3°C | 13.0°C | 32.6°C | 5.0°C | 42 mm | 38% | 2.2 m/s | 4.9 |
| 1993 | 28.5°C | 21.3°C | 14.1°C | 37.5°C | 5.5°C | 30 mm | 39% | 2.4 m/s | 4.8 |
| 1992 | 30.8°C | 23.0°C | 15.1°C | 36.2°C | 10.5°C | 16 mm | 32% | 2.2 m/s | 4.8 |
| 1991 | 30.6°C | 23.0°C | 15.5°C | 37.2°C | 1.2°C | 24 mm | 31% | 2.2 m/s | 4.8 |
| 1990 | 29.9°C | 21.8°C | 13.6°C | 34.5°C | 7.1°C | 5 mm | 37% | 2.4 m/s | 5.1 |
| 1989 | 28.6°C | 21.1°C | 13.7°C | 34.9°C | 3.9°C | 36 mm | 40% | 2.3 m/s | 4.8 |
| 1988 | 31.4°C | 24.1°C | 16.8°C | 36.7°C | 13.5°C | 42 mm | 43% | 2.1 m/s | 4.7 |
| 1987 | 30.8°C | 23.7°C | 16.5°C | 37.9°C | 13.0°C | 35 mm | 36% | 2.2 m/s | 4.6 |
| 1986 | 27.8°C | 20.2°C | 12.6°C | 32.2°C | 7.2°C | 39 mm | 43% | 2.4 m/s | 4.7 |
| 1985 | 28.0°C | 20.8°C | 13.6°C | 33.9°C | 10.0°C | 38 mm | 49% | 2.3 m/s | 4.5 |
| 1984 ❄️ | 25.0°C | 18.1°C | 11.2°C | 32.1°C | 4.8°C | 38 mm | 52% | 2.1 m/s | 4.4 |
| 1983 | 27.3°C | 20.9°C | 14.4°C | 30.4°C | 11.2°C | 70 mm | 61% | 2.3 m/s | — |
| 1982 | 29.3°C | 20.8°C | 12.3°C | 34.4°C | 5.2°C | 1 mm | 27% | 2.6 m/s | — |
| 1981 | 27.7°C | 20.1°C | 12.5°C | 32.2°C | 6.1°C | 25 mm | 40% | 2.5 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 29.9°C with lows near 14.8°C (mean 22.4°C), based on 45 years of NASA POWER data.
October averages 22 mm of rainfall in San Tan Valley, about average for rainfall. The wettest on record was 105 mm in 2000.
The hottest October reached 42.1°C in 2024. The coldest dipped to 1.2°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 3.6°C. Daytime highs moved from 27.5°C to 31.2°C and overnight lows from 12.8°C to 16.2°C over the same span.
October is one of the warmer months of the year in San Tan Valley and about average for rainfall, so plan for around 29.9°C daytime highs and 14.8°C at night.
Not quite — October is the 7th coolest month in San Tan Valley, averaging 22.4°C.
For October in San Tan Valley, pack light layers you can adjust through the day, with typical highs of 29.9°C and lows of 14.8°C.
Relative humidity in October averages 35% — relatively dry.
Average wind speed in October is 2.3 m/s. The windiest October on record averaged 2.7 m/s (1998).
The wettest October on record was 2000 with 105 mm. On average, October sees 22 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 Tan Valley 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.
