October is close to Richland's year-round average, with average highs near 17.9°C and lows around 5.9°C (mean 11.9°C). It is about average for rainfall, averaging 22 mm of rainfall and 60% relative humidity across the period.
October is close to Richland's year-round average. Across 45 years of records, the warmest October in Richland was 2022 — when the month averaged 15.8°C — while the coldest was 2019 at 9°C. Typical October days reach 17.9°C with nights near 5.9°C. The long-term trend is warming, about 0.2°C per decade.
October is about average for rainfall in Richland, averaging 22 mm of rainfall. The wettest October on record was 2016 with 81 mm, while the driest were 1987 and 1988 at 2 mm.
Relative humidity in Richland during October averages 60%. The most humid October was 2016 at 71%, and the least humid was 1987 at 43%.
October receives about 3 kWh/m²/day of solar energy in Richland. The sunniest October was 2002 at 3.5 kWh/m²/day, and the cloudiest was 2016 at 2.4.
Average wind speed in Richland during October is 2.1 m/s. The windiest Octobers were 1985 and 2017 at 2.7 m/s, while the calmest was 1987 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 11.5°C | 11.8°C | 12.1°C | 12.5°C | +0.8°C |
| Avg High | 18.0°C | 17.6°C | 17.8°C | 17.8°C | 18.5°C | +0.5°C |
| Avg Low | 5.4°C | 5.4°C | 5.8°C | 6.4°C | 6.4°C | +1°C |
| Avg Rain | 18 mm | 26 mm | 16 mm | 29 mm | 21 mm | +4 mm |
October temperatures in Richland have risen by about 1.9°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -7.1°C (2019) to a record high of 30.5°C (2014).
Rainfall in October is about average for rainfall, averaging 22 mm, with a wettest year of 81 mm.
A good time to visit Richland
October is a good time to visit Richland, with days averaging 17.9°C and nights around 5.9°C (mean 11.9°C, close to Richland's yearly average) and low rainfall. August and June 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 | 16.3°C | 10.7°C | 5.0°C | 22.9°C | 1.3°C | 28 mm | 69% | 2.3 m/s | 3 |
| 2024 | 17.4°C | 11.0°C | 4.7°C | 24.3°C | 1.0°C | 13 mm | 66% | 1.9 m/s | 3.1 |
| 2023 | 18.7°C | 12.7°C | 6.8°C | 26.6°C | -4.4°C | 20 mm | 61% | 1.7 m/s | 3 |
| 2022 🔥 | 22.2°C | 15.8°C | 9.4°C | 29.2°C | 1.9°C | 24 mm | 56% | 1.9 m/s | 3.2 |
| 2021 | 17.7°C | 11.8°C | 5.9°C | 24.2°C | -0.5°C | 25 mm | 61% | 2.3 m/s | 3 |
| 2020 | 18.7°C | 12.8°C | 6.8°C | 28.1°C | -4.4°C | 19 mm | 57% | 2.4 m/s | 3.1 |
| 2019 ❄️ | 14.9°C | 9.0°C | 3.0°C | 25.1°C | -7.1°C | 20 mm | 55% | 2.4 m/s | 3.1 |
| 2018 | 17.8°C | 11.8°C | 5.8°C | 24.7°C | 2.7°C | 26 mm | 58% | 1.9 m/s | 3 |
| 2017 | 17.2°C | 11.2°C | 5.2°C | 24.3°C | 0.1°C | 28 mm | 59% | 2.7 m/s | 3.1 |
| 2016 🌧️ | 16.8°C | 11.9°C | 7.0°C | 24.3°C | 1.8°C | 81 mm | 71% | 2.4 m/s | 2.4 |
| 2015 | 21.0°C | 15.2°C | 9.3°C | 27.4°C | 4.6°C | 18 mm | 59% | 2.2 m/s | 3 |
| 2014 | 20.2°C | 14.6°C | 8.9°C | 30.5°C | 3.7°C | 23 mm | 63% | 2.1 m/s | 2.8 |
| 2013 | 16.5°C | 10.3°C | 4.2°C | 21.9°C | -0.2°C | 6 mm | 60% | 1.8 m/s | 3.3 |
| 2012 | 17.9°C | 12.3°C | 6.8°C | 28.0°C | 0.6°C | 37 mm | 60% | 2.4 m/s | 2.9 |
| 2011 | 17.5°C | 12.1°C | 6.7°C | 23.8°C | -0.4°C | 21 mm | 66% | 2.1 m/s | 2.7 |
| 2010 | 17.9°C | 12.4°C | 7.0°C | 28.0°C | 1.8°C | 29 mm | 62% | 2.1 m/s | 2.9 |
| 2009 | 15.3°C | 9.8°C | 4.3°C | 22.8°C | -4.5°C | 29 mm | 61% | 2.5 m/s | 2.7 |
| 2008 | 17.3°C | 11.3°C | 5.3°C | 28.6°C | 0.5°C | 9 mm | 55% | 1.9 m/s | 3.1 |
| 2007 | 16.8°C | 10.9°C | 5.0°C | 25.3°C | -2.1°C | 17 mm | 64% | 2.2 m/s | 3 |
| 2006 | 18.2°C | 11.9°C | 5.7°C | 24.5°C | -5.2°C | 16 mm | 55% | 1.9 m/s | 3.2 |
| 2005 | 18.3°C | 12.8°C | 7.4°C | 23.6°C | 2.9°C | 23 mm | 65% | 1.8 m/s | 2.9 |
| 2004 | 19.3°C | 13.3°C | 7.3°C | 27.7°C | 1.8°C | 21 mm | 59% | 2.2 m/s | 3 |
| 2003 | 20.4°C | 14.4°C | 8.5°C | 28.8°C | -4.2°C | 8 mm | 54% | 2.5 m/s | 3 |
| 2002 | 17.2°C | 10.5°C | 3.8°C | 24.0°C | -5.6°C | 3 mm | 51% | 1.8 m/s | 3.5 |
| 2001 | 17.6°C | 11.5°C | 5.4°C | 26.8°C | -1.0°C | 20 mm | 60% | 2.6 m/s | 2.9 |
| 2000 | 17.5°C | 11.3°C | 5.1°C | 23.4°C | -0.5°C | 17 mm | 61% | 1.7 m/s | 3 |
| 1999 | 18.0°C | 11.7°C | 5.4°C | 25.3°C | -0.5°C | 18 mm | 53% | 2.2 m/s | 3.1 |
| 1998 | 16.9°C | 11.1°C | 5.3°C | 25.2°C | -0.8°C | 8 mm | 62% | 1.9 m/s | 3.2 |
| 1997 | 16.6°C | 10.8°C | 4.9°C | 24.9°C | -0.2°C | 36 mm | 67% | 2.5 m/s | 3 |
| 1996 | 16.5°C | 10.7°C | 4.9°C | 25.5°C | -4.3°C | 42 mm | 63% | 2.2 m/s | 2.8 |
| 1995 | 16.7°C | 10.7°C | 4.7°C | 23.2°C | -4.7°C | 28 mm | 63% | 2.2 m/s | 2.9 |
| 1994 | 17.8°C | 11.6°C | 5.4°C | 26.5°C | 0.4°C | 46 mm | 59% | 2.2 m/s | 3.3 |
| 1993 | 19.6°C | 13.2°C | 6.9°C | 27.8°C | 1.1°C | 5 mm | 57% | 1.6 m/s | 3.1 |
| 1992 | 18.8°C | 12.7°C | 6.5°C | 28.4°C | -1.0°C | 18 mm | 59% | 1.7 m/s | 2.8 |
| 1991 | 17.8°C | 11.5°C | 5.2°C | 28.6°C | -5.9°C | 19 mm | 52% | 1.9 m/s | 3.1 |
| 1990 | 16.9°C | 11.0°C | 5.2°C | 23.4°C | 0.6°C | 36 mm | 61% | 2.5 m/s | 2.9 |
| 1989 | 18.0°C | 11.7°C | 5.4°C | 25.3°C | -1.9°C | 16 mm | 58% | 1.8 m/s | 3.1 |
| 1988 | 21.9°C | 15.2°C | 8.5°C | 29.4°C | -0.7°C | 2 mm | 54% | 1.7 m/s | 3.2 |
| 1987 | 20.7°C | 13.5°C | 6.4°C | 30.0°C | 1.7°C | 2 mm | 43% | 1.4 m/s | 3.4 |
| 1986 | 19.3°C | 12.8°C | 6.2°C | 26.0°C | 1.8°C | 15 mm | 58% | 1.5 m/s | 3.4 |
| 1985 | 16.6°C | 10.4°C | 4.3°C | 24.6°C | -4.3°C | 17 mm | 60% | 2.7 m/s | 2.8 |
| 1984 | 15.4°C | 9.5°C | 3.6°C | 26.9°C | -3.4°C | 13 mm | 60% | 2.2 m/s | 3 |
| 1983 | 17.5°C | 11.3°C | 5.0°C | 23.3°C | 2.0°C | 20 mm | 62% | 1.5 m/s | — |
| 1982 | 15.9°C | 10.2°C | 4.6°C | 22.3°C | -2.9°C | 47 mm | 66% | 1.9 m/s | — |
| 1981 | 16.9°C | 10.9°C | 4.9°C | 26.3°C | 0.8°C | 27 mm | 60% | 2 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 17.9°C with lows near 5.9°C (mean 11.9°C), based on 45 years of NASA POWER data.
October averages 22 mm of rainfall in Richland, about average for rainfall. The wettest on record was 81 mm in 2016.
The hottest October reached 30.5°C in 2014. The coldest dipped to -7.1°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1.9°C. Daytime highs moved from 16.5°C to 18.5°C and overnight lows from 4.5°C to 6.4°C over the same span.
October is close to Richland's year-round average and about average for rainfall, so plan for around 17.9°C daytime highs and 5.9°C at night.
Not quite — October is the 7th coolest month in Richland, averaging 11.9°C.
For October in Richland, pack warm layers and a jacket for chilly mornings, with typical highs of 17.9°C and lows of 5.9°C.
Relative humidity in October averages 60% — moderately humid.
Average wind speed in October is 2.1 m/s. The windiest October on record averaged 2.7 m/s (1985).
The wettest October on record was 2016 with 81 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 Richland 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.
