August is one of the cooler months of the year in Merredin, with average highs near 17.5°C and lows around 5.4°C (mean 11.5°C). It is a relatively wet time of year, averaging 44 mm of rainfall and 75% relative humidity across the period.
August is one of the cooler months of the year in Merredin. Across 45 years of records, the warmest August in Merredin was 2014 — when the month averaged 14.1°C — while the coldest was 1986 at 9.4°C. Typical August days reach 17.5°C with nights near 5.4°C. The long-term trend is warming, about 0.2°C per decade.
August is a relatively wet time of year in Merredin, averaging 44 mm of rainfall. The wettest August on record was 2025 with 113 mm, while the driest was 1989 at 17 mm.
Relative humidity in Merredin during August averages 75%. The most humid August was 1992 at 82%, and the least humid was 2010 at 67%.
August receives about 4 kWh/m²/day of solar energy in Merredin. The sunniest August was 1989 at 4.5 kWh/m²/day, and the cloudiest were 1992 and 1998 at 3.6.
Average wind speed in Merredin during August is 2.8 m/s. The windiest August was 1992 at 3.3 m/s, while the calmest was 2023 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.0°C | 11.2°C | 11.4°C | 12.0°C | 11.6°C | +0.6°C |
| Avg High | 17.0°C | 17.1°C | 17.6°C | 18.1°C | 17.5°C | +0.5°C |
| Avg Low | 5.1°C | 5.3°C | 5.1°C | 5.9°C | 5.8°C | +0.7°C |
| Avg Rain | 37 mm | 45 mm | 39 mm | 42 mm | 68 mm | +31 mm |
August temperatures in Merredin have stayed relatively stable across the record.
August has ranged from a record low of -0.6°C (1997) to a record high of 29.4°C (2006).
Rainfall in August is a relatively wet time of year, averaging 44 mm, with a wettest year of 113 mm.
A quieter season to visit Merredin
If your dates are flexible, the more temperate months of November and March tend to be the most comfortable for visiting Merredin. That said, August — with days averaging 17.5°C and nights around 5.4°C (mean 11.5°C) and moderate rainfall (44 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🌧️ | 17.1°C | 11.2°C | 5.3°C | 25.1°C | 1.7°C | 113 mm | 77% | 2.8 m/s | 3.9 |
| 2024 | 17.9°C | 12.3°C | 6.6°C | 23.3°C | 1.4°C | 64 mm | 80% | 3 m/s | 3.8 |
| 2023 | 19.9°C | 13.1°C | 6.3°C | 27.3°C | 1.1°C | 28 mm | 75% | 2.1 m/s | 4.1 |
| 2022 | 16.2°C | 10.5°C | 4.9°C | 21.7°C | 1.4°C | 99 mm | 79% | 3 m/s | 4 |
| 2021 | 16.9°C | 11.1°C | 5.4°C | 24.2°C | 2.6°C | 41 mm | 79% | 2.7 m/s | 4 |
| 2020 | 16.8°C | 11.5°C | 6.2°C | 26.7°C | 3.4°C | 62 mm | 78% | 2.9 m/s | 4 |
| 2019 | 18.4°C | 11.9°C | 5.3°C | 26.5°C | 1.8°C | 50 mm | 70% | 2.8 m/s | 4.2 |
| 2018 | 16.4°C | 10.8°C | 5.2°C | 25.6°C | 1.9°C | 65 mm | 77% | 3 m/s | 3.7 |
| 2017 | 17.5°C | 11.6°C | 5.7°C | 23.6°C | 0.4°C | 47 mm | 77% | 3 m/s | 3.8 |
| 2016 | 15.8°C | 10.3°C | 4.8°C | 23.3°C | 0.0°C | 50 mm | 78% | 2.8 m/s | 3.7 |
| 2015 | 17.1°C | 11.6°C | 6.1°C | 23.5°C | 2.1°C | 43 mm | 78% | 2.6 m/s | 3.8 |
| 2014 🔥 | 20.6°C | 14.1°C | 7.5°C | 25.9°C | 1.7°C | 22 mm | 69% | 2.6 m/s | 4 |
| 2013 | 19.2°C | 13.1°C | 7.1°C | 25.3°C | 3.0°C | 49 mm | 76% | 2.7 m/s | 3.7 |
| 2012 | 19.4°C | 12.8°C | 6.1°C | 26.5°C | 2.1°C | 23 mm | 70% | 2.4 m/s | 4.1 |
| 2011 | 18.6°C | 12.3°C | 6.0°C | 26.0°C | 2.3°C | 43 mm | 75% | 2.7 m/s | 4.1 |
| 2010 | 18.3°C | 11.5°C | 4.7°C | 24.6°C | 1.2°C | 28 mm | 67% | 2.3 m/s | 4.2 |
| 2009 | 18.0°C | 12.3°C | 6.6°C | 22.1°C | 3.5°C | 50 mm | 81% | 2.6 m/s | 3.7 |
| 2008 | 16.9°C | 10.3°C | 3.8°C | 21.0°C | 1.2°C | 18 mm | 69% | 2.6 m/s | 4.3 |
| 2007 | 18.8°C | 12.2°C | 5.7°C | 24.5°C | 1.9°C | 28 mm | 73% | 2.8 m/s | 4.1 |
| 2006 | 21.0°C | 14.0°C | 6.9°C | 29.4°C | 1.5°C | 30 mm | 69% | 2.9 m/s | 4.1 |
| 2005 | 17.0°C | 10.9°C | 4.9°C | 23.4°C | 1.0°C | 44 mm | 75% | 2.7 m/s | 3.8 |
| 2004 | 15.7°C | 10.1°C | 4.6°C | 20.6°C | 1.0°C | 43 mm | 78% | 2.9 m/s | 3.9 |
| 2003 | 16.4°C | 11.0°C | 5.6°C | 20.5°C | 2.0°C | 69 mm | 78% | 2.7 m/s | 3.8 |
| 2002 | 18.4°C | 11.3°C | 4.3°C | 24.7°C | 0.2°C | 30 mm | 69% | 2.7 m/s | 4.1 |
| 2001 | 17.7°C | 11.0°C | 4.3°C | 23.7°C | 1.2°C | 33 mm | 74% | 2.3 m/s | 4.2 |
| 2000 | 16.5°C | 10.5°C | 4.4°C | 20.5°C | 1.0°C | 42 mm | 74% | 2.8 m/s | 3.8 |
| 1999 | 16.9°C | 10.9°C | 4.9°C | 22.3°C | 0.1°C | 42 mm | 78% | 2.8 m/s | 4.1 |
| 1998 | 18.5°C | 12.9°C | 7.4°C | 26.0°C | 1.9°C | 40 mm | 80% | 2.8 m/s | 3.6 |
| 1997 | 17.3°C | 11.0°C | 4.8°C | 22.1°C | -0.6°C | 48 mm | 73% | 2.6 m/s | 4 |
| 1996 | 16.2°C | 10.5°C | 4.8°C | 23.5°C | 0.5°C | 42 mm | 79% | 2.7 m/s | 3.8 |
| 1995 | 17.7°C | 11.6°C | 5.4°C | 26.3°C | 1.7°C | 20 mm | 77% | 2.8 m/s | 4.2 |
| 1994 | 19.2°C | 12.7°C | 6.2°C | 27.5°C | 3.0°C | 48 mm | 70% | 2.7 m/s | 4.1 |
| 1993 | 16.6°C | 10.5°C | 4.5°C | 23.2°C | 0.3°C | 52 mm | 79% | 2.8 m/s | 3.9 |
| 1992 | 15.3°C | 10.4°C | 5.4°C | 21.0°C | -0.4°C | 105 mm | 82% | 3.3 m/s | 3.6 |
| 1991 | 17.3°C | 11.4°C | 5.5°C | 24.0°C | 1.5°C | 23 mm | 74% | 3 m/s | 4.1 |
| 1990 | 15.8°C | 10.0°C | 4.1°C | 20.7°C | 0.2°C | 27 mm | 76% | 3.1 m/s | 3.7 |
| 1989 | 16.4°C | 10.0°C | 3.6°C | 20.7°C | 0.4°C | 17 mm | 73% | 2.4 m/s | 4.5 |
| 1988 | 16.8°C | 11.1°C | 5.3°C | 23.9°C | 1.2°C | 52 mm | 77% | 2.8 m/s | 3.8 |
| 1987 | 18.1°C | 11.3°C | 4.6°C | 24.1°C | 0.2°C | 38 mm | 68% | 2.5 m/s | 3.9 |
| 1986 ❄️ | 15.0°C | 9.4°C | 3.8°C | 20.5°C | 1.0°C | 35 mm | 80% | 2.5 m/s | 4.1 |
| 1985 | 16.9°C | 11.2°C | 5.4°C | 22.2°C | 1.3°C | 36 mm | 76% | 3.1 m/s | 3.8 |
| 1984 | 16.2°C | 10.5°C | 4.9°C | 21.7°C | 2.3°C | 28 mm | 80% | 2.9 m/s | 4 |
| 1983 | 18.7°C | 12.7°C | 6.7°C | 24.8°C | 0.6°C | 37 mm | 75% | 3 m/s | — |
| 1982 | 19.5°C | 12.9°C | 6.4°C | 27.0°C | 0.8°C | 55 mm | 75% | 2.6 m/s | — |
| 1981 | 15.7°C | 10.3°C | 4.9°C | 18.5°C | 1.0°C | 37 mm | 80% | 3.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 17.5°C with lows near 5.4°C (mean 11.5°C), based on 45 years of NASA POWER data.
August averages 44 mm of rainfall in Merredin, a relatively wet time of year. The wettest on record was 113 mm in 2025.
The hottest August reached 29.4°C in 2006. The coldest dipped to -0.6°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.1°C. Daytime highs moved from 17.4°C to 17.6°C and overnight lows from 5.7°C to 5.7°C over the same span.
August is one of the cooler months of the year in Merredin and a relatively wet time of year, so plan for around 17.5°C daytime highs and 5.4°C at night.
Not quite — August is the 2nd coolest month in Merredin, averaging 11.5°C.
For August in Merredin, pack warm layers and a jacket for chilly mornings, with typical highs of 17.5°C and lows of 5.4°C.
Relative humidity in August averages 75% — quite humid.
Average wind speed in August is 2.8 m/s. The windiest August on record averaged 3.3 m/s (1992).
The wettest August on record was 2025 with 113 mm. On average, August sees 44 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 August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
