October is one of the warmer months of the year in Decatur, with average highs near 19°C and lows around 6.6°C (mean 12.8°C). It is about average for rainfall, averaging 84 mm of rainfall and 71% relative humidity across the period.
October is one of the warmer months of the year in Decatur. Across 45 years of records, the warmest October in Decatur was 2025 — when the month averaged 16.2°C — while the coldest was 1987 at 9.4°C. Typical October days reach 19°C with nights near 6.6°C. The long-term trend is warming, about 0.4°C per decade.
October is about average for rainfall in Decatur, averaging 84 mm of rainfall. The wettest October on record was 2009 with 253 mm, while the driest was 2024 at 14 mm.
Relative humidity in Decatur during October averages 71%. The most humid October was 2009 at 83%, and the least humid was 1988 at 58%.
October receives about 3.3 kWh/m²/day of solar energy in Decatur. The sunniest Octobers were 2010 and 2024 at 4 kWh/m²/day, and the cloudiest were 1984 and 2009 at 2.5.
Average wind speed in Decatur during October is 3.1 m/s. The windiest October was 2012 at 3.8 m/s, while the calmest were 1992, 2000 and 2003 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.2°C | 12.5°C | 12.6°C | 13.1°C | 14.1°C | +1.9°C |
| Avg High | 18.3°C | 19.0°C | 18.6°C | 19.2°C | 20.5°C | +2.2°C |
| Avg Low | 6.1°C | 6.0°C | 6.7°C | 7.1°C | 7.7°C | +1.6°C |
| Avg Rain | 74 mm | 79 mm | 105 mm | 83 mm | 77 mm | +4 mm |
October temperatures in Decatur have risen by about 1.5°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -6.2°C (1992) to a record high of 32.5°C (2007).
Rainfall in October is about average for rainfall, averaging 84 mm, with a wettest year of 253 mm.
A good time to visit Decatur
October is a good time to visit Decatur, with days averaging 19°C and nights around 6.6°C (mean 12.8°C, warmer than Decatur's yearly average) and higher rainfall. June 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 🔥 | 22.8°C | 16.2°C | 9.5°C | 32.3°C | 1.2°C | 46 mm | 60% | 3 m/s | 3.5 |
| 2024 | 22.3°C | 14.9°C | 7.4°C | 29.0°C | 0.0°C | 14 mm | 59% | 2.9 m/s | 4 |
| 2023 | 20.0°C | 14.0°C | 8.0°C | 31.5°C | -4.4°C | 101 mm | 69% | 3.3 m/s | 3.2 |
| 2022 | 19.3°C | 12.4°C | 5.4°C | 26.5°C | -3.8°C | 61 mm | 62% | 3.3 m/s | 3.8 |
| 2021 | 20.4°C | 15.3°C | 10.3°C | 29.0°C | 2.4°C | 170 mm | 81% | 3.1 m/s | 2.7 |
| 2020 | 18.1°C | 11.8°C | 5.4°C | 28.4°C | -2.0°C | 73 mm | 69% | 3.2 m/s | 3.1 |
| 2019 | 18.4°C | 12.4°C | 6.4°C | 31.9°C | -5.0°C | 113 mm | 72% | 3.3 m/s | 3.1 |
| 2018 | 18.7°C | 12.7°C | 6.6°C | 30.5°C | -3.5°C | 78 mm | 74% | 3.2 m/s | 3.4 |
| 2017 | 20.3°C | 14.6°C | 8.9°C | 29.5°C | -3.8°C | 136 mm | 71% | 3.4 m/s | 3 |
| 2016 | 21.3°C | 15.4°C | 9.5°C | 28.4°C | 2.3°C | 58 mm | 78% | 3.1 m/s | 3.3 |
| 2015 | 19.9°C | 13.6°C | 7.4°C | 27.0°C | -0.3°C | 39 mm | 67% | 3.4 m/s | 3.6 |
| 2014 | 17.4°C | 12.0°C | 6.7°C | 26.7°C | -1.0°C | 115 mm | 79% | 3.2 m/s | 2.9 |
| 2013 | 19.0°C | 12.7°C | 6.4°C | 30.0°C | -4.2°C | 100 mm | 72% | 3 m/s | 3.1 |
| 2012 | 16.8°C | 11.0°C | 5.3°C | 26.9°C | -2.7°C | 118 mm | 73% | 3.8 m/s | 3.2 |
| 2011 | 20.0°C | 13.4°C | 6.8°C | 29.7°C | -0.3°C | 39 mm | 65% | 3 m/s | 3.7 |
| 2010 | 19.8°C | 13.3°C | 6.8°C | 27.6°C | -3.2°C | 34 mm | 68% | 3 m/s | 4 |
| 2009 🌧️ | 14.4°C | 9.6°C | 4.8°C | 21.6°C | -2.3°C | 253 mm | 83% | 3.3 m/s | 2.5 |
| 2008 | 18.0°C | 12.0°C | 6.0°C | 26.3°C | -3.8°C | 63 mm | 78% | 3 m/s | 3.7 |
| 2007 | 22.1°C | 16.0°C | 9.9°C | 32.5°C | -0.2°C | 94 mm | 69% | 3.4 m/s | 3.2 |
| 2006 | 17.0°C | 10.8°C | 4.7°C | 32.4°C | -3.9°C | 82 mm | 69% | 3.5 m/s | 3.3 |
| 2005 | 19.9°C | 14.0°C | 8.0°C | 30.5°C | 0.6°C | 63 mm | 69% | 2.8 m/s | 3.4 |
| 2004 | 19.1°C | 13.3°C | 7.5°C | 27.6°C | -1.0°C | 143 mm | 72% | 3.2 m/s | 2.9 |
| 2003 | 19.3°C | 12.8°C | 6.3°C | 28.0°C | -1.5°C | 50 mm | 69% | 2.7 m/s | 3.6 |
| 2002 | 17.5°C | 11.4°C | 5.3°C | 30.5°C | -0.9°C | 74 mm | 72% | 2.8 m/s | 3.2 |
| 2001 | 17.9°C | 12.0°C | 6.1°C | 28.4°C | -2.3°C | 154 mm | 73% | 3.6 m/s | 3.3 |
| 2000 | 20.8°C | 14.3°C | 7.9°C | 28.8°C | -2.7°C | 76 mm | 71% | 2.7 m/s | 3.4 |
| 1999 | 19.7°C | 12.7°C | 5.8°C | 26.8°C | -3.1°C | 50 mm | 64% | 3.1 m/s | 3.6 |
| 1998 | 20.1°C | 13.6°C | 7.2°C | 26.4°C | -0.2°C | 83 mm | 73% | 2.9 m/s | 3.5 |
| 1997 | 19.6°C | 13.0°C | 6.5°C | 30.8°C | -2.9°C | 44 mm | 66% | 3.1 m/s | 3.6 |
| 1996 | 20.1°C | 13.1°C | 6.1°C | 28.4°C | -2.4°C | 47 mm | 68% | 3.4 m/s | 3.4 |
| 1995 | 20.1°C | 13.4°C | 6.7°C | 28.3°C | 0.1°C | 78 mm | 64% | 3.5 m/s | 3.5 |
| 1994 | 19.5°C | 13.1°C | 6.6°C | 29.4°C | -1.4°C | 66 mm | 71% | 3 m/s | 3.2 |
| 1993 | 15.7°C | 9.9°C | 4.2°C | 24.9°C | -3.8°C | 73 mm | 82% | 2.8 m/s | 3.2 |
| 1992 | 18.5°C | 11.9°C | 5.4°C | 27.8°C | -6.2°C | 50 mm | 70% | 2.7 m/s | 3.3 |
| 1991 | 18.6°C | 12.7°C | 6.8°C | 27.7°C | -2.4°C | 166 mm | 74% | 3.5 m/s | 3.4 |
| 1990 | 18.0°C | 11.3°C | 4.6°C | 28.7°C | -1.5°C | 133 mm | 72% | 3.3 m/s | 3.4 |
| 1989 | 19.5°C | 12.8°C | 6.1°C | 27.9°C | -0.5°C | 27 mm | 70% | 3.3 m/s | 3.5 |
| 1988 | 16.0°C | 9.6°C | 3.2°C | 25.6°C | -5.1°C | 38 mm | 58% | 3.3 m/s | 3.6 |
| 1987 ❄️ | 16.0°C | 9.4°C | 2.9°C | 23.8°C | -2.1°C | 36 mm | 62% | 3 m/s | 3.5 |
| 1986 | 17.8°C | 12.3°C | 6.8°C | 24.1°C | -0.4°C | 100 mm | 82% | 2.8 m/s | 2.9 |
| 1985 | 19.9°C | 14.1°C | 8.2°C | 28.1°C | 1.8°C | 97 mm | 71% | 3.2 m/s | 3 |
| 1984 | 20.4°C | 14.8°C | 9.2°C | 26.9°C | 1.0°C | 106 mm | 77% | 2.9 m/s | 2.5 |
| 1983 | 19.3°C | 13.4°C | 7.5°C | 31.1°C | 0.3°C | 118 mm | 70% | 3.3 m/s | — |
| 1982 | 19.4°C | 12.9°C | 6.4°C | 28.3°C | -3.9°C | 85 mm | 71% | 3 m/s | — |
| 1981 | 16.4°C | 10.5°C | 4.5°C | 26.8°C | -5.8°C | 55 mm | 76% | 3.1 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 19°C with lows near 6.6°C (mean 12.8°C), based on 45 years of NASA POWER data.
October averages 84 mm of rainfall in Decatur, about average for rainfall. The wettest on record was 253 mm in 2009.
The hottest October reached 32.5°C in 2007. The coldest dipped to -6.2°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1.5°C. Daytime highs moved from 19.1°C to 21°C and overnight lows from 7.2°C to 8.1°C over the same span.
October is one of the warmer months of the year in Decatur and about average for rainfall, so plan for around 19°C daytime highs and 6.6°C at night.
Not quite — October is the 7th coolest month in Decatur, averaging 12.8°C.
For October in Decatur, pack warm layers and a jacket for chilly mornings, with typical highs of 19°C and lows of 6.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 71% — moderately humid.
Average wind speed in October is 3.1 m/s. The windiest October on record averaged 3.8 m/s (2012).
The wettest October on record was 2009 with 253 mm. On average, October sees 84 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 Decatur 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.
