July is one of the cooler months of the year in Merredin, with average highs near 16.1°C and lows around 5.2°C (mean 10.7°C). It is a relatively wet time of year, averaging 55 mm of rainfall and 77% relative humidity across the period.
July is one of the cooler months of the year in Merredin. Across 45 years of records, the warmest July in Merredin was 2007 — when the month averaged 12.8°C — while the coldest was 1986 at 8.7°C. Typical July days reach 16.1°C with nights near 5.2°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Merredin, averaging 55 mm of rainfall. The wettest July on record was 2021 with 155 mm, while the driest was 2005 at 13 mm.
Relative humidity in Merredin during July averages 77%. The most humid July was 2021 at 85%, and the least humid was 1997 at 67%.
July receives about 3 kWh/m²/day of solar energy in Merredin. The sunniest July was 2020 at 3.5 kWh/m²/day, and the cloudiest was 1984 at 2.6.
Average wind speed in Merredin during July is 2.8 m/s. The windiest July was 1996 at 3.8 m/s, while the calmest were 1994, 2005 and 2015 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.0°C | 10.7°C | 10.9°C | 10.8°C | 10.9°C | +0.9°C |
| Avg High | 15.5°C | 16.1°C | 16.5°C | 16.4°C | 16.3°C | +0.8°C |
| Avg Low | 4.5°C | 5.3°C | 5.4°C | 5.3°C | 5.6°C | +1.1°C |
| Avg Rain | 45 mm | 55 mm | 47 mm | 52 mm | 87 mm | +42 mm |
July temperatures in Merredin have risen by about 0.7°C between 1981–1985 and 2021–2025.
July has ranged from a record low of -1.3°C (1990) to a record high of 23.7°C (1987).
Rainfall in July is a relatively wet time of year, averaging 55 mm, with a wettest year of 155 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, July — with days averaging 16.1°C and nights around 5.2°C (mean 10.7°C) and moderate rainfall (55 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 | 15.0°C | 9.6°C | 4.2°C | 21.0°C | 1.3°C | 92 mm | 79% | 2.7 m/s | 3 |
| 2024 | 17.1°C | 11.7°C | 6.4°C | 22.4°C | 1.9°C | 99 mm | 78% | 3 m/s | 3.1 |
| 2023 | 16.3°C | 10.6°C | 5.0°C | 20.9°C | 0.6°C | 60 mm | 77% | 2.7 m/s | 3.2 |
| 2022 | 17.1°C | 11.2°C | 5.2°C | 22.0°C | 1.8°C | 69 mm | 73% | 2.6 m/s | 3.1 |
| 2021 🌧️ | 15.2°C | 11.2°C | 7.2°C | 18.3°C | 2.7°C | 155 mm | 85% | 3.5 m/s | 2.7 |
| 2020 | 17.0°C | 11.2°C | 5.4°C | 22.5°C | 1.8°C | 47 mm | 77% | 2.6 m/s | 3.5 |
| 2019 | 16.9°C | 11.4°C | 5.8°C | 20.7°C | 2.6°C | 37 mm | 78% | 2.4 m/s | 3.2 |
| 2018 | 17.4°C | 11.9°C | 6.4°C | 21.3°C | 3.1°C | 62 mm | 75% | 3.1 m/s | 3.1 |
| 2017 | 16.1°C | 10.9°C | 5.7°C | 21.8°C | 1.4°C | 47 mm | 78% | 2.9 m/s | 3 |
| 2016 | 15.1°C | 9.6°C | 4.1°C | 21.6°C | -0.3°C | 45 mm | 77% | 2.9 m/s | 3.1 |
| 2015 | 16.5°C | 11.2°C | 5.8°C | 22.6°C | 0.6°C | 90 mm | 75% | 2.3 m/s | 2.8 |
| 2014 | 16.2°C | 10.9°C | 5.5°C | 22.5°C | 2.9°C | 57 mm | 80% | 2.8 m/s | 3 |
| 2013 | 16.5°C | 10.7°C | 4.9°C | 22.3°C | 0.9°C | 52 mm | 74% | 2.6 m/s | 3.1 |
| 2012 | 16.9°C | 10.5°C | 4.0°C | 20.8°C | 0.7°C | 26 mm | 68% | 2.4 m/s | 3.3 |
| 2011 | 16.1°C | 11.3°C | 6.6°C | 22.2°C | 3.1°C | 65 mm | 81% | 2.8 m/s | 2.7 |
| 2010 | 15.8°C | 9.8°C | 3.9°C | 20.2°C | -0.1°C | 41 mm | 75% | 2.4 m/s | 3.2 |
| 2009 | 15.5°C | 10.3°C | 5.1°C | 20.4°C | 1.5°C | 58 mm | 79% | 2.7 m/s | 3 |
| 2008 | 16.1°C | 10.7°C | 5.3°C | 21.3°C | 0.5°C | 84 mm | 77% | 2.9 m/s | 2.9 |
| 2007 🔥 | 18.3°C | 12.8°C | 7.3°C | 23.1°C | 4.1°C | 59 mm | 71% | 3.5 m/s | 2.9 |
| 2006 | 16.9°C | 10.8°C | 4.7°C | 22.6°C | 1.5°C | 27 mm | 73% | 2.6 m/s | 3.2 |
| 2005 | 16.1°C | 10.3°C | 4.5°C | 21.1°C | -0.6°C | 13 mm | 78% | 2.3 m/s | 3.3 |
| 2004 | 15.6°C | 10.1°C | 4.6°C | 20.7°C | 0.0°C | 44 mm | 76% | 2.6 m/s | 3 |
| 2003 | 15.8°C | 10.5°C | 5.2°C | 21.1°C | 0.6°C | 41 mm | 80% | 2.7 m/s | 2.9 |
| 2002 | 17.4°C | 11.8°C | 6.2°C | 23.0°C | -0.6°C | 30 mm | 72% | 3.2 m/s | 3 |
| 2001 | 17.2°C | 11.1°C | 5.0°C | 23.1°C | 0.2°C | 63 mm | 72% | 2.6 m/s | 3 |
| 2000 | 15.9°C | 10.9°C | 6.0°C | 19.1°C | 1.3°C | 53 mm | 79% | 3.5 m/s | 2.9 |
| 1999 | 16.3°C | 10.7°C | 5.1°C | 20.8°C | 1.3°C | 57 mm | 78% | 2.9 m/s | 3.2 |
| 1998 | 14.7°C | 9.6°C | 4.4°C | 19.0°C | 0.3°C | 56 mm | 81% | 2.7 m/s | 2.8 |
| 1997 | 16.8°C | 10.2°C | 3.6°C | 22.9°C | -1.2°C | 45 mm | 67% | 2.7 m/s | 3.2 |
| 1996 | 16.4°C | 11.4°C | 6.5°C | 21.1°C | 0.8°C | 78 mm | 77% | 3.8 m/s | 2.7 |
| 1995 | 15.5°C | 10.8°C | 6.1°C | 20.4°C | 1.7°C | 99 mm | 82% | 3 m/s | 2.9 |
| 1994 | 17.6°C | 11.8°C | 6.1°C | 23.1°C | 1.8°C | 24 mm | 77% | 2.3 m/s | 3.2 |
| 1993 | 14.8°C | 9.8°C | 4.7°C | 19.9°C | 0.4°C | 30 mm | 80% | 3.1 m/s | 3.1 |
| 1992 | 17.3°C | 11.8°C | 6.2°C | 21.5°C | 1.4°C | 36 mm | 78% | 2.6 m/s | 3.2 |
| 1991 | 16.3°C | 11.0°C | 5.8°C | 22.8°C | -0.5°C | 64 mm | 79% | 2.9 m/s | 2.9 |
| 1990 | 14.8°C | 9.6°C | 4.4°C | 21.0°C | -1.3°C | 61 mm | 78% | 3.3 m/s | 3.1 |
| 1989 | 14.5°C | 9.3°C | 4.2°C | 20.1°C | 0.4°C | 31 mm | 81% | 2.4 m/s | 3.1 |
| 1988 | 15.9°C | 10.4°C | 4.9°C | 20.7°C | 0.3°C | 49 mm | 77% | 3 m/s | 3.1 |
| 1987 | 16.5°C | 10.8°C | 5.2°C | 23.7°C | 0.3°C | 47 mm | 73% | 2.9 m/s | 3.1 |
| 1986 ❄️ | 13.9°C | 8.7°C | 3.5°C | 17.9°C | -1.2°C | 39 mm | 78% | 2.8 m/s | 3.1 |
| 1985 | 16.9°C | 11.3°C | 5.7°C | 20.8°C | 1.1°C | 63 mm | 72% | 2.8 m/s | 2.9 |
| 1984 | 14.6°C | 9.8°C | 4.9°C | 18.5°C | 0.7°C | 44 mm | 80% | 3 m/s | 2.6 |
| 1983 | 16.6°C | 10.4°C | 4.2°C | 22.1°C | -0.4°C | 62 mm | 72% | 2.6 m/s | — |
| 1982 | 16.0°C | 9.5°C | 3.1°C | 20.6°C | -0.4°C | 23 mm | 72% | 2.7 m/s | — |
| 1981 | 15.0°C | 9.8°C | 4.7°C | 19.4°C | 0.7°C | 49 mm | 81% | 2.6 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 16.1°C with lows near 5.2°C (mean 10.7°C), based on 45 years of NASA POWER data.
July averages 55 mm of rainfall in Merredin, a relatively wet time of year. The wettest on record was 155 mm in 2021.
The hottest July reached 23.7°C in 1987. The coldest dipped to -1.3°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.7°C. Daytime highs moved from 15.8°C to 16.1°C and overnight lows from 4.5°C to 5.6°C over the same span.
July is one of the cooler months of the year in Merredin and a relatively wet time of year, so plan for around 16.1°C daytime highs and 5.2°C at night.
Yes — July is the coldest month of the year in Merredin, averaging 10.7°C.
For July in Merredin, pack warm layers and a jacket for chilly mornings, with typical highs of 16.1°C and lows of 5.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 77% — quite humid.
Average wind speed in July is 2.8 m/s. The windiest July on record averaged 3.8 m/s (1996).
The wettest July on record was 2021 with 155 mm. On average, July sees 55 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
