October is one of the warmer months of the year in Decatur, with average highs near 23.5°C and lows around 10.5°C (mean 17°C). It is one of the drier months, averaging 87 mm of rainfall and 70% 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 2016 — when the month averaged 21.2°C — while the coldest was 1988 at 12.7°C. Typical October days reach 23.5°C with nights near 10.5°C. The long-term trend is warming, about 0.4°C per decade.
October is one of the drier months in Decatur, averaging 87 mm of rainfall. The wettest October on record was 1995 with 205 mm, while the driest was 2005 at 5 mm.
Relative humidity in Decatur during October averages 70%. The most humid October was 2002 at 85%, and the least humid was 2016 at 53%.
October receives about 3.9 kWh/m²/day of solar energy in Decatur. The sunniest October was 2010 at 4.7 kWh/m²/day, and the cloudiest was 2002 at 2.8.
Average wind speed in Decatur during October is 1 m/s. The windiest October was 2001 at 1.2 m/s, while the calmest were 2003, 2013 and 2024, among others at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.4°C | 16.5°C | 17.1°C | 17.6°C | 17.8°C | +1.4°C |
| Avg High | 22.7°C | 23.3°C | 23.5°C | 24.1°C | 24.4°C | +1.7°C |
| Avg Low | 10.2°C | 9.8°C | 10.7°C | 11.1°C | 11.2°C | +1°C |
| Avg Rain | 91 mm | 91 mm | 80 mm | 92 mm | 78 mm | -13 mm |
October temperatures in Decatur have stayed relatively stable across the record.
October has ranged from a record low of -1.8°C (1997) to a record high of 37.8°C (2019).
Rainfall in October is one of the drier months, averaging 87 mm, with a wettest year of 205 mm.
A good time to visit Decatur
October is a good time to visit Decatur, with days averaging 23.5°C and nights around 10.5°C (mean 17°C, warmer than Decatur's yearly average) and higher rainfall. September and May 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 | 24.5°C | 18.0°C | 11.5°C | 30.8°C | 3.9°C | 92 mm | 68% | 1.1 m/s | 3.9 |
| 2024 | 26.9°C | 19.2°C | 11.5°C | 31.9°C | 3.0°C | 11 mm | 63% | 0.9 m/s | 4.6 |
| 2023 | 25.3°C | 18.5°C | 11.6°C | 32.3°C | 2.3°C | 15 mm | 60% | 1.1 m/s | 3.9 |
| 2022 | 23.5°C | 15.8°C | 8.1°C | 28.7°C | -0.4°C | 63 mm | 61% | 1.1 m/s | 4.6 |
| 2021 | 23.2°C | 18.0°C | 12.9°C | 27.9°C | 5.3°C | 132 mm | 82% | 1 m/s | 3.8 |
| 2020 | 23.1°C | 17.2°C | 11.3°C | 29.3°C | 2.9°C | 157 mm | 80% | 1 m/s | 3.9 |
| 2019 | 25.4°C | 18.9°C | 12.5°C | 37.8°C | 0.5°C | 198 mm | 69% | 1 m/s | 3.4 |
| 2018 | 24.1°C | 18.3°C | 12.5°C | 32.0°C | 2.6°C | 60 mm | 73% | 1 m/s | 3.7 |
| 2017 | 22.9°C | 16.7°C | 10.5°C | 29.5°C | -0.2°C | 170 mm | 76% | 1.1 m/s | 4.1 |
| 2016 🔥 | 28.6°C | 21.2°C | 13.8°C | 33.1°C | 5.9°C | 8 mm | 53% | 1 m/s | 4.5 |
| 2015 | 24.4°C | 17.9°C | 11.3°C | 31.1°C | 3.4°C | 81 mm | 70% | 1.1 m/s | 3.7 |
| 2014 | 23.4°C | 17.4°C | 11.4°C | 31.8°C | 3.2°C | 181 mm | 77% | 1.1 m/s | 4 |
| 2013 | 23.8°C | 17.6°C | 11.4°C | 31.4°C | -0.6°C | 29 mm | 72% | 0.9 m/s | 3.8 |
| 2012 | 20.7°C | 14.9°C | 9.1°C | 26.9°C | 0.7°C | 72 mm | 76% | 1.1 m/s | 3.8 |
| 2011 | 22.2°C | 15.2°C | 8.2°C | 29.3°C | 1.0°C | 30 mm | 68% | 1.1 m/s | 4.2 |
| 2010 | 25.3°C | 17.6°C | 9.9°C | 31.3°C | 2.1°C | 89 mm | 56% | 1.1 m/s | 4.7 |
| 2009 | 20.0°C | 14.7°C | 9.4°C | 28.3°C | 0.7°C | 205 mm | 84% | 1.1 m/s | 3.1 |
| 2008 | 23.1°C | 16.6°C | 10.1°C | 29.6°C | -1.5°C | 74 mm | 67% | 1 m/s | 4.2 |
| 2007 | 25.7°C | 19.0°C | 12.3°C | 32.4°C | 2.7°C | 66 mm | 67% | 1.1 m/s | 4 |
| 2006 | 21.8°C | 15.1°C | 8.4°C | 31.5°C | 0.1°C | 133 mm | 71% | 1.1 m/s | 3.9 |
| 2005 | 24.5°C | 17.4°C | 10.3°C | 31.6°C | 1.4°C | 5 mm | 67% | 1.1 m/s | 4 |
| 2004 | 24.8°C | 19.3°C | 13.8°C | 28.8°C | 4.7°C | 97 mm | 78% | 1 m/s | 3.2 |
| 2003 | 23.9°C | 17.1°C | 10.2°C | 27.9°C | 4.5°C | 21 mm | 70% | 0.9 m/s | 4 |
| 2002 | 22.4°C | 17.6°C | 12.8°C | 30.2°C | 4.9°C | 107 mm | 85% | 1 m/s | 2.8 |
| 2001 | 22.0°C | 15.0°C | 8.1°C | 27.9°C | -1.5°C | 87 mm | 65% | 1.2 m/s | 4.5 |
| 2000 | 26.4°C | 18.8°C | 11.1°C | 32.1°C | 0.5°C | 8 mm | 57% | 0.9 m/s | 4.3 |
| 1999 | 24.8°C | 17.2°C | 9.6°C | 29.5°C | 0.9°C | 57 mm | 61% | 1.1 m/s | 4.4 |
| 1998 | 26.9°C | 19.5°C | 12.1°C | 32.5°C | 3.3°C | 37 mm | 58% | 1 m/s | 4.4 |
| 1997 | 21.8°C | 15.4°C | 9.0°C | 29.9°C | -1.8°C | 164 mm | 73% | 1 m/s | 4.1 |
| 1996 | 22.6°C | 16.2°C | 9.8°C | 27.4°C | 2.8°C | 56 mm | 74% | 1 m/s | 3.9 |
| 1995 🌧️ | 21.3°C | 15.2°C | 9.0°C | 29.4°C | 2.3°C | 205 mm | 81% | 1 m/s | 3.9 |
| 1994 | 21.8°C | 16.2°C | 10.6°C | 28.5°C | 1.0°C | 132 mm | 80% | 1.1 m/s | 3.2 |
| 1993 | 22.7°C | 16.0°C | 9.4°C | 30.0°C | -1.3°C | 52 mm | 69% | 1.1 m/s | 3.3 |
| 1992 | 22.7°C | 15.9°C | 9.1°C | 27.3°C | 2.1°C | 83 mm | 74% | 0.9 m/s | 3.5 |
| 1991 | 23.8°C | 17.1°C | 10.3°C | 28.7°C | 2.4°C | 35 mm | 68% | 1 m/s | 4.2 |
| 1990 | 24.1°C | 16.7°C | 9.4°C | 30.9°C | 0.9°C | 91 mm | 66% | 1.1 m/s | 4 |
| 1989 | 21.1°C | 14.9°C | 8.7°C | 26.7°C | -1.1°C | 39 mm | 80% | 1 m/s | 3.9 |
| 1988 ❄️ | 18.7°C | 12.7°C | 6.6°C | 25.1°C | 1.0°C | 70 mm | 76% | 1 m/s | 3.6 |
| 1987 | 21.6°C | 13.6°C | 5.7°C | 28.2°C | -1.2°C | 28 mm | 56% | 1 m/s | 4.4 |
| 1986 | 22.9°C | 17.2°C | 11.5°C | 32.6°C | 3.3°C | 131 mm | 75% | 1 m/s | 3.5 |
| 1985 | 23.3°C | 18.2°C | 13.0°C | 28.7°C | 5.1°C | 131 mm | 80% | 1.1 m/s | 2.9 |
| 1984 | 26.1°C | 20.7°C | 15.2°C | 30.6°C | 3.7°C | 191 mm | 73% | 1 m/s | 3.3 |
| 1983 | 24.4°C | 17.7°C | 11.0°C | 30.6°C | 3.6°C | 65 mm | 69% | 1 m/s | — |
| 1982 | 23.8°C | 16.9°C | 10.1°C | 31.4°C | 1.4°C | 70 mm | 69% | 1 m/s | — |
| 1981 | 22.3°C | 16.0°C | 9.7°C | 31.3°C | -0.4°C | 98 mm | 67% | 1 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 23.5°C with lows near 10.5°C (mean 17°C), based on 45 years of NASA POWER data.
October averages 87 mm of rainfall in Decatur, one of the drier months. The wettest on record was 205 mm in 1995.
The hottest October reached 37.8°C in 2019. The coldest dipped to -1.8°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have held steady by about 0°C — but days and nights have moved in opposite directions. Daytime highs rose from 24°C to 24.7°C while overnight lows fell from 11.8°C to 11.1°C, widening the gap between day and night.
October is one of the warmer months of the year in Decatur and one of the drier months, so plan for around 23.5°C daytime highs and 10.5°C at night.
Not quite — October is the 7th coolest month in Decatur, averaging 17°C.
For October in Decatur, pack light layers you can adjust through the day, with typical highs of 23.5°C and lows of 10.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 70% — moderately humid.
Average wind speed in October is 1 m/s. The windiest October on record averaged 1.2 m/s (2001).
The wettest October on record was 1995 with 205 mm. On average, October sees 87 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.
