July is one of the cooler months of the year in Perth, with average highs near 17.6°C and lows around 13.7°C (mean 15.7°C). It is a relatively wet time of year, averaging 142 mm of rainfall and 73% relative humidity across the period.
July is one of the cooler months of the year in Perth. Across 45 years of records, the warmest July in Perth was 2024 — when the month averaged 16.7°C — while the coldest was 1986 at 14.2°C. Typical July days reach 17.6°C with nights near 13.7°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Perth, averaging 142 mm of rainfall. The wettest July on record was 2000 with 263 mm, while the driest was 2020 at 51 mm.
Relative humidity in Perth during July averages 73%. The most humid July was 1991 at 76%, and the least humid was 2006 at 70%.
July receives about 2.8 kWh/m²/day of solar energy in Perth. The sunniest July was 2012 at 3.3 kWh/m²/day, and the cloudiest was 1984 at 2.4.
Average wind speed in Perth during July is 5.4 m/s. The windiest July was 1996 at 7.3 m/s, while the calmest was 2019 at 4.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.3°C | 15.7°C | 15.7°C | 15.7°C | 16.1°C | +0.8°C |
| Avg High | 17.2°C | 17.6°C | 17.6°C | 17.7°C | 18.1°C | +0.9°C |
| Avg Low | 13.5°C | 13.8°C | 13.8°C | 13.6°C | 14.2°C | +0.7°C |
| Avg Rain | 154 mm | 157 mm | 162 mm | 116 mm | 113 mm | -41 mm |
July temperatures in Perth have risen by about 0.7°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 8.5°C (1997) to a record high of 22.2°C (1994).
Rainfall in July is a relatively wet time of year, averaging 142 mm, with a wettest year of 263 mm.
A quieter season to visit Perth
If your dates are flexible, the more temperate months of December and March tend to be the most comfortable for visiting Perth. That said, July — with days averaging 17.6°C and nights around 13.7°C (mean 15.7°C) and higher rainfall (142 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 | 17.3°C | 15.4°C | 13.5°C | 21.4°C | 9.9°C | 111 mm | 73% | 5.4 m/s | 2.9 |
| 2024 🔥 | 18.7°C | 16.7°C | 14.7°C | 21.4°C | 11.5°C | 127 mm | 73% | 5.7 m/s | 2.9 |
| 2023 | 17.7°C | 15.9°C | 14.0°C | 20.2°C | 9.7°C | 79 mm | 73% | 5.3 m/s | 2.9 |
| 2022 | 18.4°C | 16.1°C | 13.9°C | 22.2°C | 10.2°C | 105 mm | 73% | 5 m/s | 2.9 |
| 2021 | 17.7°C | 16.4°C | 15.1°C | 20.3°C | 13.2°C | 201 mm | 74% | 6.4 m/s | 2.6 |
| 2020 | 18.6°C | 16.2°C | 13.9°C | 21.7°C | 10.3°C | 51 mm | 74% | 5.2 m/s | 3.1 |
| 2019 | 18.2°C | 16.1°C | 14.0°C | 20.5°C | 10.7°C | 70 mm | 74% | 4.3 m/s | 3 |
| 2018 | 18.1°C | 16.4°C | 14.7°C | 20.7°C | 10.4°C | 119 mm | 73% | 5.8 m/s | 2.8 |
| 2017 | 17.8°C | 16.2°C | 14.6°C | 22.1°C | 12.2°C | 133 mm | 72% | 5.8 m/s | 2.7 |
| 2016 | 16.8°C | 14.6°C | 12.4°C | 20.3°C | 9.2°C | 80 mm | 73% | 5.5 m/s | 3 |
| 2015 | 18.0°C | 15.9°C | 13.7°C | 21.0°C | 9.9°C | 135 mm | 75% | 4.5 m/s | 2.8 |
| 2014 | 17.5°C | 15.8°C | 14.0°C | 21.4°C | 10.7°C | 157 mm | 75% | 5.3 m/s | 2.8 |
| 2013 | 17.8°C | 15.9°C | 14.0°C | 21.2°C | 10.4°C | 156 mm | 71% | 5.2 m/s | 2.9 |
| 2012 | 17.7°C | 15.0°C | 12.2°C | 20.7°C | 9.9°C | 52 mm | 72% | 4.4 m/s | 3.3 |
| 2011 | 17.4°C | 15.5°C | 13.7°C | 20.3°C | 9.7°C | 146 mm | 75% | 5.4 m/s | 2.7 |
| 2010 | 17.3°C | 15.2°C | 13.0°C | 19.8°C | 9.8°C | 118 mm | 71% | 4.6 m/s | 3 |
| 2009 | 16.9°C | 15.0°C | 13.0°C | 19.3°C | 10.2°C | 143 mm | 73% | 5.2 m/s | 3 |
| 2008 | 17.4°C | 15.5°C | 13.5°C | 20.3°C | 10.9°C | 207 mm | 74% | 5.6 m/s | 2.6 |
| 2007 | 18.4°C | 16.6°C | 14.8°C | 21.3°C | 12.0°C | 189 mm | 72% | 6.2 m/s | 2.6 |
| 2006 | 17.8°C | 15.5°C | 13.2°C | 21.7°C | 9.9°C | 102 mm | 70% | 5 m/s | 3 |
| 2005 | 17.4°C | 15.5°C | 13.6°C | 20.7°C | 9.1°C | 74 mm | 73% | 4.6 m/s | 3.2 |
| 2004 | 17.1°C | 15.2°C | 13.3°C | 19.3°C | 10.3°C | 147 mm | 73% | 4.9 m/s | 3.2 |
| 2003 | 17.2°C | 15.6°C | 14.0°C | 19.5°C | 10.9°C | 166 mm | 73% | 5.2 m/s | 2.7 |
| 2002 | 17.9°C | 16.3°C | 14.6°C | 21.1°C | 8.9°C | 140 mm | 72% | 5.7 m/s | 2.8 |
| 2001 | 18.1°C | 15.8°C | 13.4°C | 22.2°C | 10.2°C | 185 mm | 72% | 4.8 m/s | 2.8 |
| 2000 🌧️ | 17.4°C | 15.9°C | 14.5°C | 19.4°C | 9.6°C | 263 mm | 74% | 6.4 m/s | 2.9 |
| 1999 | 18.5°C | 16.3°C | 14.0°C | 21.6°C | 11.6°C | 139 mm | 74% | 5.6 m/s | 2.9 |
| 1998 | 17.2°C | 15.1°C | 13.0°C | 20.3°C | 10.4°C | 149 mm | 74% | 5 m/s | 2.7 |
| 1997 | 17.5°C | 14.7°C | 12.0°C | 21.1°C | 8.5°C | 153 mm | 72% | 5.2 m/s | 3 |
| 1996 | 18.1°C | 16.6°C | 15.0°C | 21.1°C | 11.3°C | 216 mm | 74% | 7.3 m/s | 2.5 |
| 1995 | 17.5°C | 15.9°C | 14.3°C | 20.8°C | 11.3°C | 240 mm | 75% | 5.9 m/s | 2.6 |
| 1994 | 17.8°C | 16.3°C | 14.7°C | 22.2°C | 11.3°C | 120 mm | 75% | 4.8 m/s | 2.9 |
| 1993 | 16.9°C | 15.0°C | 13.2°C | 20.1°C | 9.3°C | 135 mm | 75% | 6.1 m/s | 2.9 |
| 1992 | 18.0°C | 16.3°C | 14.6°C | 21.0°C | 11.7°C | 76 mm | 74% | 4.7 m/s | 2.7 |
| 1991 | 17.6°C | 15.9°C | 14.3°C | 20.3°C | 10.5°C | 158 mm | 76% | 5.6 m/s | 2.7 |
| 1990 | 16.4°C | 14.6°C | 12.9°C | 18.7°C | 9.4°C | 184 mm | 73% | 6.1 m/s | 3.1 |
| 1989 | 16.9°C | 15.3°C | 13.7°C | 18.6°C | 11.1°C | 175 mm | 72% | 4.8 m/s | 2.8 |
| 1988 | 17.7°C | 15.7°C | 13.7°C | 20.3°C | 9.2°C | 165 mm | 74% | 5.7 m/s | 2.9 |
| 1987 | 17.6°C | 15.7°C | 13.8°C | 21.7°C | 10.1°C | 147 mm | 74% | 5.1 m/s | 2.8 |
| 1986 ❄️ | 16.0°C | 14.2°C | 12.4°C | 18.6°C | 9.4°C | 181 mm | 74% | 5.5 m/s | 2.8 |
| 1985 | 18.3°C | 15.9°C | 13.6°C | 20.6°C | 11.2°C | 109 mm | 73% | 5.1 m/s | 2.9 |
| 1984 | 16.8°C | 15.0°C | 13.2°C | 20.1°C | 10.6°C | 98 mm | 75% | 5.7 m/s | 2.4 |
| 1983 | 17.5°C | 15.6°C | 13.7°C | 19.9°C | 9.8°C | 145 mm | 71% | 4.8 m/s | — |
| 1982 | 17.1°C | 15.2°C | 13.4°C | 20.5°C | 9.7°C | 211 mm | 72% | 5.1 m/s | — |
| 1981 | 16.8°C | 15.3°C | 13.7°C | 19.1°C | 11.0°C | 153 mm | 75% | 5.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 17.6°C with lows near 13.7°C (mean 15.7°C), based on 45 years of NASA POWER data.
July averages 142 mm of rainfall in Perth, a relatively wet time of year. The wettest on record was 263 mm in 2000.
The hottest July reached 22.2°C in 1994. The coldest dipped to 8.5°C in 1997.
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 17.3°C to 18°C and overnight lows from 13.5°C to 14.2°C over the same span.
July is one of the cooler months of the year in Perth and a relatively wet time of year, so plan for around 17.6°C daytime highs and 13.7°C at night.
Not quite — July is the 2nd coolest month in Perth, averaging 15.7°C.
For July in Perth, pack light layers you can adjust through the day, with typical highs of 17.6°C and lows of 13.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 73% — moderately humid.
Average wind speed in July is 5.4 m/s. The windiest July on record averaged 7.3 m/s (1996).
The wettest July on record was 2000 with 263 mm. On average, July sees 142 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 Perth 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.
