October is one of the cooler months of the year in Merredin, with average highs near 25.5°C and lows around 9.2°C (mean 17.4°C). It is one of the drier months, averaging 18 mm of rainfall and 57% relative humidity across the period.
October is one of the cooler months of the year in Merredin. Across 45 years of records, the warmest October in Merredin was 2015 — when the month averaged 20.8°C — while the coldest were 1986 and 2021 at 14.6°C. Typical October days reach 25.5°C with nights near 9.2°C. The long-term trend is warming, about 0.3°C per decade.
October is one of the drier months in Merredin, averaging 18 mm of rainfall. The wettest October on record was 2021 with 60 mm, while the driest was 2000 at 1 mm.
Relative humidity in Merredin during October averages 57%. The most humid October was 2025 at 67%, and the least humid was 2010 at 42%.
October receives about 6.8 kWh/m²/day of solar energy in Merredin. The sunniest Octobers were 1994, 2010 and 2023 at 7.3 kWh/m²/day, and the cloudiest was 2011 at 5.8.
Average wind speed in Merredin during October is 3.2 m/s. The windiest October was 2012 at 3.7 m/s, while the calmest were 1992 and 2025 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.8°C | 17.0°C | 17.4°C | 18.3°C | 17.2°C | +0.4°C |
| Avg High | 25.0°C | 25.1°C | 25.6°C | 26.5°C | 24.9°C | -0.1°C |
| Avg Low | 8.5°C | 8.8°C | 9.2°C | 10.1°C | 9.4°C | +0.9°C |
| Avg Rain | 12 mm | 16 mm | 16 mm | 22 mm | 26 mm | +14 mm |
October temperatures in Merredin have fallen by about 0.4°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 0.7°C (1994) to a record high of 38.1°C (2015).
Rainfall in October is one of the drier months, averaging 18 mm, with a wettest year of 60 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Merredin
October is a good time to visit Merredin, with days averaging 25.5°C and nights around 9.2°C (mean 17.4°C, close to Merredin's yearly average) and low rainfall. November and March 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 | 23.9°C | 16.4°C | 8.9°C | 33.1°C | 5.1°C | 27 mm | 67% | 2.8 m/s | 7 |
| 2024 | 27.2°C | 19.1°C | 10.9°C | 35.0°C | 6.2°C | 26 mm | 58% | 2.9 m/s | 7.1 |
| 2023 | 28.3°C | 19.6°C | 10.8°C | 37.7°C | 5.7°C | 7 mm | 47% | 3.2 m/s | 7.3 |
| 2022 | 22.0°C | 14.9°C | 7.9°C | 30.1°C | 3.0°C | 22 mm | 66% | 3 m/s | 6.5 |
| 2021 🌧️ | 21.6°C | 14.6°C | 7.5°C | 31.3°C | 3.6°C | 60 mm | 67% | 3.2 m/s | 6.6 |
| 2020 | 26.5°C | 18.4°C | 10.3°C | 33.9°C | 3.5°C | 13 mm | 57% | 3.2 m/s | 7 |
| 2019 | 27.4°C | 19.0°C | 10.6°C | 35.1°C | 6.0°C | 23 mm | 52% | 3 m/s | 7.1 |
| 2018 | 25.3°C | 18.1°C | 10.8°C | 32.9°C | 6.8°C | 34 mm | 63% | 3.3 m/s | 6.1 |
| 2017 | 25.2°C | 17.1°C | 9.1°C | 33.3°C | 4.2°C | 21 mm | 57% | 3.4 m/s | 7 |
| 2016 | 24.2°C | 15.9°C | 7.6°C | 34.1°C | 3.1°C | 11 mm | 58% | 3.6 m/s | 7 |
| 2015 🔥 | 29.4°C | 20.8°C | 12.2°C | 38.1°C | 4.9°C | 9 mm | 51% | 3.1 m/s | 6.9 |
| 2014 | 28.0°C | 19.6°C | 11.2°C | 35.8°C | 5.6°C | 31 mm | 55% | 3.1 m/s | 6.9 |
| 2013 | 26.1°C | 17.6°C | 9.2°C | 37.1°C | 4.8°C | 26 mm | 59% | 3 m/s | 7.2 |
| 2012 | 27.5°C | 19.1°C | 10.8°C | 37.0°C | 7.4°C | 7 mm | 47% | 3.7 m/s | 7 |
| 2011 | 24.7°C | 17.6°C | 10.5°C | 31.4°C | 5.0°C | 60 mm | 64% | 3.1 m/s | 5.8 |
| 2010 | 26.8°C | 18.0°C | 9.2°C | 35.0°C | 4.4°C | 3 mm | 42% | 3.3 m/s | 7.3 |
| 2009 | 26.9°C | 18.5°C | 10.1°C | 34.8°C | 2.6°C | 17 mm | 57% | 3.1 m/s | 6.9 |
| 2008 | 24.8°C | 17.5°C | 10.2°C | 32.1°C | 3.6°C | 47 mm | 63% | 3.3 m/s | 6.2 |
| 2007 | 25.7°C | 17.4°C | 9.1°C | 34.5°C | 4.4°C | 23 mm | 56% | 3.4 m/s | 6.9 |
| 2006 | 27.4°C | 18.9°C | 10.3°C | 35.6°C | 6.5°C | 13 mm | 53% | 3.5 m/s | 6.8 |
| 2005 | 22.9°C | 15.2°C | 7.4°C | 31.3°C | 1.8°C | 13 mm | 62% | 3 m/s | 6.7 |
| 2004 | 26.6°C | 18.1°C | 9.6°C | 35.3°C | 5.0°C | 20 mm | 57% | 3.4 m/s | 6.7 |
| 2003 | 24.9°C | 16.9°C | 9.0°C | 30.7°C | 5.2°C | 8 mm | 59% | 3.2 m/s | 7 |
| 2002 | 26.1°C | 17.6°C | 9.1°C | 34.7°C | 3.7°C | 10 mm | 53% | 3.5 m/s | 6.6 |
| 2001 | 23.9°C | 15.9°C | 7.9°C | 28.5°C | 3.4°C | 13 mm | 55% | 3.3 m/s | 6.4 |
| 2000 | 26.9°C | 18.1°C | 9.2°C | 35.1°C | 5.1°C | 1 mm | 47% | 3.1 m/s | 7.1 |
| 1999 | 24.1°C | 16.2°C | 8.2°C | 30.5°C | 4.1°C | 27 mm | 59% | 3.3 m/s | 6.9 |
| 1998 | 25.0°C | 16.9°C | 8.8°C | 37.1°C | 4.0°C | 7 mm | 57% | 3.3 m/s | 6.9 |
| 1997 | 25.6°C | 17.6°C | 9.6°C | 33.4°C | 4.7°C | 11 mm | 53% | 3.4 m/s | 7.1 |
| 1996 | 25.7°C | 17.3°C | 8.9°C | 34.3°C | 2.5°C | 13 mm | 56% | 3.1 m/s | 6.7 |
| 1995 | 25.5°C | 17.4°C | 9.4°C | 33.5°C | 4.3°C | 34 mm | 57% | 3.3 m/s | 6.9 |
| 1994 | 26.0°C | 17.3°C | 8.7°C | 34.1°C | 0.7°C | 4 mm | 49% | 3.2 m/s | 7.3 |
| 1993 | 23.2°C | 15.0°C | 6.8°C | 30.5°C | 2.2°C | 9 mm | 59% | 3.2 m/s | 7 |
| 1992 | 23.6°C | 16.2°C | 8.7°C | 35.0°C | 0.9°C | 11 mm | 63% | 2.8 m/s | 6.6 |
| 1991 | 27.8°C | 19.2°C | 10.6°C | 34.9°C | 5.4°C | 11 mm | 54% | 3.3 m/s | 7.1 |
| 1990 | 24.1°C | 16.5°C | 8.8°C | 37.0°C | 3.3°C | 34 mm | 61% | 3.2 m/s | 6.5 |
| 1989 | 23.0°C | 15.0°C | 7.0°C | 29.8°C | 2.3°C | 13 mm | 62% | 3.3 m/s | 6.6 |
| 1988 | 25.5°C | 17.1°C | 8.6°C | 36.1°C | 2.6°C | 11 mm | 62% | 3.2 m/s | 7.1 |
| 1987 | 25.8°C | 17.6°C | 9.4°C | 33.5°C | 4.4°C | 17 mm | 54% | 3.4 m/s | 6.8 |
| 1986 ❄️ | 22.3°C | 14.6°C | 6.8°C | 30.2°C | 3.0°C | 10 mm | 59% | 3.1 m/s | 6.9 |
| 1985 | 24.7°C | 16.4°C | 8.1°C | 34.4°C | 3.0°C | 9 mm | 52% | 3.5 m/s | 6.9 |
| 1984 | 25.6°C | 17.3°C | 9.0°C | 31.8°C | 5.6°C | 7 mm | 56% | 3.2 m/s | 6.6 |
| 1983 | 26.5°C | 18.1°C | 9.7°C | 36.8°C | 5.7°C | 4 mm | 52% | 3.1 m/s | — |
| 1982 | 25.6°C | 17.6°C | 9.6°C | 33.2°C | 4.1°C | 20 mm | 55% | 3.6 m/s | — |
| 1981 | 26.0°C | 17.3°C | 8.6°C | 36.5°C | 3.4°C | 15 mm | 53% | 3.2 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 25.5°C with lows near 9.2°C (mean 17.4°C), based on 45 years of NASA POWER data.
October averages 18 mm of rainfall in Merredin, one of the drier months. The wettest on record was 60 mm in 2021.
The hottest October reached 38.1°C in 2015. The coldest dipped to 0.7°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have fallen by about 0.4°C — but days and nights have moved in opposite directions. Overnight lows rose from 9°C to 9.2°C while daytime highs eased from 25.7°C to 24.6°C, narrowing the gap between day and night.
October is one of the cooler months of the year in Merredin and one of the drier months, so plan for around 25.5°C daytime highs and 9.2°C at night.
Not quite — October is the 6th coolest month in Merredin, averaging 17.4°C.
For October in Merredin, pack light layers you can adjust through the day, with typical highs of 25.5°C and lows of 9.2°C.
Relative humidity in October averages 57% — moderately humid.
Average wind speed in October is 3.2 m/s. The windiest October on record averaged 3.7 m/s (2012).
The wettest October on record was 2021 with 60 mm. On average, October sees 18 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 Merredin 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.
