October is one of the warmer months of the year in Joliet, with average highs near 17.6°C and lows around 5.7°C (mean 11.7°C). It is about average for rainfall, averaging 84 mm of rainfall and 74% relative humidity across the period.
October is one of the warmer months of the year in Joliet. Across 45 years of records, the warmest October in Joliet was 2021 — when the month averaged 14.9°C — while the coldest was 1987 at 7.7°C. Typical October days reach 17.6°C with nights near 5.7°C. The long-term trend is warming, about 0.5°C per decade.
October is about average for rainfall in Joliet, averaging 84 mm of rainfall. The wettest October on record was 1991 with 203 mm, while the driest was 2024 at 25 mm.
Relative humidity in Joliet during October averages 74%. The most humid October was 1986 at 84%, and the least humid was 2024 at 57%.
October receives about 3 kWh/m²/day of solar energy in Joliet. The sunniest October was 2024 at 3.9 kWh/m²/day, and the cloudiest was 2009 at 2.2.
Average wind speed in Joliet during October is 3.1 m/s. The windiest October was 2012 at 3.7 m/s, while the calmest were 2003, 2005 and 2011, among others at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.9°C | 11.2°C | 11.6°C | 12.0°C | 13.1°C | +2.2°C |
| Avg High | 16.8°C | 17.3°C | 17.4°C | 17.7°C | 19.3°C | +2.5°C |
| Avg Low | 5.0°C | 5.0°C | 5.9°C | 6.3°C | 7.0°C | +2°C |
| Avg Rain | 73 mm | 84 mm | 84 mm | 93 mm | 83 mm | +10 mm |
October temperatures in Joliet have risen by about 1.8°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -9.3°C (2019) to a record high of 32.2°C (2025).
Rainfall in October is about average for rainfall, averaging 84 mm, with a wettest year of 203 mm.
A good time to visit Joliet
October is a good time to visit Joliet, with days averaging 17.6°C and nights around 5.7°C (mean 11.7°C, warmer than Joliet's yearly average) and higher rainfall. August 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 | 20.6°C | 14.5°C | 8.3°C | 32.2°C | -1.4°C | 52 mm | 67% | 3 m/s | 3.3 |
| 2024 | 22.2°C | 14.8°C | 7.5°C | 29.8°C | 0.4°C | 25 mm | 57% | 3.2 m/s | 3.9 |
| 2023 | 18.5°C | 12.8°C | 7.2°C | 30.5°C | -4.5°C | 105 mm | 74% | 3.2 m/s | 2.9 |
| 2022 | 18.3°C | 11.5°C | 4.7°C | 26.4°C | -3.1°C | 62 mm | 65% | 3.2 m/s | 3.5 |
| 2021 🔥 | 20.0°C | 14.9°C | 9.9°C | 30.6°C | 1.5°C | 190 mm | 79% | 2.9 m/s | 2.5 |
| 2020 | 16.2°C | 10.2°C | 4.1°C | 26.8°C | -3.7°C | 64 mm | 73% | 3.2 m/s | 2.9 |
| 2019 | 15.7°C | 10.3°C | 4.9°C | 29.3°C | -9.3°C | 143 mm | 80% | 3.2 m/s | 2.9 |
| 2018 | 16.6°C | 11.0°C | 5.5°C | 30.7°C | -4.8°C | 113 mm | 78% | 3.1 m/s | 2.9 |
| 2017 | 19.0°C | 13.6°C | 8.1°C | 28.2°C | -3.3°C | 190 mm | 75% | 3.3 m/s | 2.6 |
| 2016 | 19.1°C | 13.7°C | 8.2°C | 27.2°C | 1.5°C | 76 mm | 81% | 3 m/s | 2.8 |
| 2015 | 18.0°C | 12.5°C | 6.9°C | 25.3°C | -1.9°C | 50 mm | 72% | 3.4 m/s | 3.2 |
| 2014 | 16.4°C | 11.1°C | 5.9°C | 24.4°C | 0.5°C | 77 mm | 79% | 3 m/s | 2.9 |
| 2013 | 17.8°C | 11.8°C | 5.7°C | 28.3°C | -4.5°C | 104 mm | 75% | 2.9 m/s | 2.9 |
| 2012 | 16.5°C | 10.7°C | 4.8°C | 26.3°C | -1.0°C | 92 mm | 73% | 3.7 m/s | 3 |
| 2011 | 18.2°C | 12.1°C | 6.0°C | 27.5°C | -1.1°C | 46 mm | 73% | 2.8 m/s | 3.4 |
| 2010 | 19.6°C | 13.1°C | 6.5°C | 29.8°C | -3.7°C | 36 mm | 68% | 3 m/s | 3.7 |
| 2009 | 13.7°C | 9.1°C | 4.6°C | 20.3°C | -3.7°C | 186 mm | 82% | 3.3 m/s | 2.2 |
| 2008 | 16.3°C | 10.8°C | 5.2°C | 27.0°C | -4.0°C | 64 mm | 79% | 3 m/s | 3.1 |
| 2007 | 20.4°C | 14.7°C | 8.9°C | 30.4°C | -0.4°C | 71 mm | 75% | 3.3 m/s | 3.1 |
| 2006 | 14.9°C | 9.3°C | 3.8°C | 27.6°C | -3.4°C | 105 mm | 75% | 3.3 m/s | 3 |
| 2005 | 18.9°C | 13.3°C | 7.7°C | 30.5°C | -0.2°C | 29 mm | 73% | 2.8 m/s | 3.2 |
| 2004 | 18.4°C | 12.5°C | 6.5°C | 26.7°C | -2.2°C | 71 mm | 73% | 3.2 m/s | 2.9 |
| 2003 | 18.1°C | 11.6°C | 5.0°C | 28.9°C | -2.2°C | 50 mm | 69% | 2.8 m/s | 3.4 |
| 2002 | 16.3°C | 10.5°C | 4.7°C | 29.3°C | -1.7°C | 52 mm | 71% | 2.8 m/s | 2.9 |
| 2001 | 16.7°C | 11.1°C | 5.6°C | 27.2°C | -1.9°C | 162 mm | 76% | 3.6 m/s | 2.7 |
| 2000 | 20.2°C | 13.5°C | 6.9°C | 28.0°C | -2.8°C | 52 mm | 72% | 2.8 m/s | 3.2 |
| 1999 | 18.2°C | 11.5°C | 4.9°C | 26.2°C | -3.8°C | 27 mm | 67% | 3.1 m/s | 3.3 |
| 1998 | 18.8°C | 12.8°C | 6.8°C | 25.9°C | -0.3°C | 93 mm | 76% | 2.9 m/s | 3.1 |
| 1997 | 18.2°C | 11.9°C | 5.7°C | 30.4°C | -4.3°C | 52 mm | 69% | 3.2 m/s | 3.2 |
| 1996 | 17.3°C | 11.1°C | 4.9°C | 26.1°C | -4.5°C | 62 mm | 74% | 3.4 m/s | 3 |
| 1995 | 17.8°C | 11.8°C | 5.7°C | 27.5°C | -0.6°C | 112 mm | 72% | 3.5 m/s | 3.1 |
| 1994 | 18.1°C | 11.9°C | 5.6°C | 26.2°C | -2.1°C | 74 mm | 72% | 3 m/s | 2.9 |
| 1993 | 14.7°C | 9.0°C | 3.4°C | 24.4°C | -3.5°C | 71 mm | 82% | 3.1 m/s | 3.1 |
| 1992 | 16.1°C | 10.0°C | 3.9°C | 24.9°C | -6.0°C | 28 mm | 77% | 2.8 m/s | 3 |
| 1991 🌧️ | 17.0°C | 11.2°C | 5.5°C | 26.0°C | -2.8°C | 203 mm | 75% | 3.5 m/s | 2.9 |
| 1990 | 16.6°C | 10.3°C | 4.0°C | 27.3°C | -2.4°C | 119 mm | 73% | 3.6 m/s | 3.1 |
| 1989 | 17.2°C | 11.1°C | 4.9°C | 25.4°C | -2.2°C | 36 mm | 75% | 3.3 m/s | 3.2 |
| 1988 | 14.3°C | 8.3°C | 2.3°C | 23.6°C | -6.3°C | 81 mm | 64% | 3.3 m/s | 3.3 |
| 1987 ❄️ | 14.0°C | 7.7°C | 1.5°C | 21.8°C | -3.0°C | 41 mm | 71% | 3 m/s | 3.1 |
| 1986 | 16.6°C | 11.2°C | 5.8°C | 23.1°C | -0.1°C | 105 mm | 84% | 2.8 m/s | 2.6 |
| 1985 | 17.5°C | 11.9°C | 6.4°C | 25.4°C | 1.1°C | 125 mm | 75% | 3.1 m/s | 2.6 |
| 1984 | 19.6°C | 13.7°C | 7.7°C | 26.3°C | -0.1°C | 91 mm | 75% | 2.9 m/s | 2.3 |
| 1983 | 17.8°C | 12.0°C | 6.2°C | 28.1°C | -0.6°C | 74 mm | 73% | 3.3 m/s | — |
| 1982 | 18.8°C | 12.4°C | 6.0°C | 28.1°C | -3.8°C | 64 mm | 68% | 3 m/s | — |
| 1981 | 15.6°C | 9.7°C | 3.8°C | 23.2°C | -5.8°C | 40 mm | 76% | 3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 17.6°C with lows near 5.7°C (mean 11.7°C), based on 45 years of NASA POWER data.
October averages 84 mm of rainfall in Joliet, about average for rainfall. The wettest on record was 203 mm in 1991.
The hottest October reached 32.2°C in 2025. The coldest dipped to -9.3°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1.8°C. Daytime highs moved from 17.9°C to 19.9°C and overnight lows from 6°C to 7.5°C over the same span.
October is one of the warmer months of the year in Joliet and about average for rainfall, so plan for around 17.6°C daytime highs and 5.7°C at night.
Not quite — October is the 7th coolest month in Joliet, averaging 11.7°C.
For October in Joliet, pack warm layers and a jacket for chilly mornings, with typical highs of 17.6°C and lows of 5.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 74% — moderately humid.
Average wind speed in October is 3.1 m/s. The windiest October on record averaged 3.7 m/s (2012).
The wettest October on record was 1991 with 203 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 Joliet 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.
