January is one of the warmer months of the year in Perth, with average highs near 26.8°C and lows around 19.5°C (mean 23.2°C). It is one of the drier months, averaging 16 mm of rainfall and 63% relative humidity across the period.
January is one of the warmer months of the year in Perth. Across 45 years of records, the warmest January in Perth was 2012 — when the month averaged 25°C — while the coldest were 1982 and 1990 at 21.4°C. Typical January days reach 26.8°C with nights near 19.5°C. The long-term trend is warming, about 0.2°C per decade.
January is one of the drier months in Perth, averaging 16 mm of rainfall. The wettest January on record was 1982 with 96 mm, while the driest was 2005 at 0 mm.
Relative humidity in Perth during January averages 63%. The most humid January was 2001 at 71%, and the least humid was 1981 at 56%.
January receives about 8.3 kWh/m²/day of solar energy in Perth. The sunniest January was 2022 at 8.8 kWh/m²/day, and the cloudiest was 2016 at 7.4.
Average wind speed in Perth during January is 5.6 m/s. The windiest Januarys were 2005 and 2018 at 6.2 m/s, while the calmest was 2016 at 4.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.9°C | 23.1°C | 22.7°C | 23.4°C | 23.9°C | +1°C |
| Avg High | 26.7°C | 26.8°C | 26.2°C | 27.0°C | 27.5°C | +0.8°C |
| Avg Low | 19.0°C | 19.3°C | 19.1°C | 19.9°C | 20.3°C | +1.3°C |
| Avg Rain | 14 mm | 11 mm | 18 mm | 26 mm | 5 mm | -9 mm |
January temperatures in Perth have risen by about 1.3°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 13.4°C (2006) to a record high of 39.1°C (2025).
Rainfall in January is one of the drier months, averaging 16 mm, with a wettest year of 96 mm.
One of the best times to visit Perth
January is one of the best times to visit Perth. Expect days averaging 26.8°C and nights around 19.5°C (mean 23.2°C) — warmer than Perth's yearly average — with low rainfall (16 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.1°C | 24.8°C | 21.5°C | 39.1°C | 17.8°C | 4 mm | 65% | 5.2 m/s | 8.1 |
| 2024 | 27.6°C | 24.0°C | 20.5°C | 35.6°C | 17.7°C | 17 mm | 65% | 5.5 m/s | 8.6 |
| 2023 | 27.2°C | 23.4°C | 19.5°C | 33.2°C | 16.1°C | 3 mm | 61% | 5.7 m/s | 8.7 |
| 2022 | 28.8°C | 24.7°C | 20.7°C | 36.6°C | 17.7°C | 1 mm | 60% | 5.7 m/s | 8.8 |
| 2021 | 27.9°C | 24.0°C | 20.2°C | 35.2°C | 17.0°C | 1 mm | 59% | 5.9 m/s | 8.3 |
| 2020 | 25.5°C | 22.5°C | 19.5°C | 35.1°C | 15.0°C | 2 mm | 65% | 5.9 m/s | 8.5 |
| 2019 | 24.9°C | 21.9°C | 18.8°C | 33.2°C | 14.9°C | 7 mm | 67% | 5.8 m/s | 8.7 |
| 2018 | 26.0°C | 22.6°C | 19.2°C | 31.2°C | 16.1°C | 81 mm | 67% | 6.2 m/s | 8.3 |
| 2017 | 26.1°C | 22.5°C | 18.9°C | 36.0°C | 16.1°C | 62 mm | 64% | 5.8 m/s | 8.2 |
| 2016 | 27.1°C | 23.7°C | 20.3°C | 34.1°C | 16.0°C | 58 mm | 66% | 4.5 m/s | 7.4 |
| 2015 | 27.2°C | 23.4°C | 19.6°C | 34.8°C | 16.2°C | 2 mm | 62% | 5.4 m/s | 8.2 |
| 2014 | 27.0°C | 23.6°C | 20.2°C | 37.8°C | 16.5°C | 2 mm | 64% | 5.6 m/s | 8.6 |
| 2013 | 27.0°C | 23.6°C | 20.2°C | 35.1°C | 16.9°C | 14 mm | 65% | 5.7 m/s | 8 |
| 2012 🔥 | 28.8°C | 25.0°C | 21.1°C | 36.1°C | 16.1°C | 14 mm | 62% | 5.3 m/s | 7.9 |
| 2011 | 27.5°C | 24.0°C | 20.5°C | 33.8°C | 18.1°C | 17 mm | 65% | 5.2 m/s | 7.9 |
| 2010 | 28.2°C | 24.0°C | 19.7°C | 37.4°C | 16.4°C | 0 mm | 60% | 5.8 m/s | 8.6 |
| 2009 | 27.1°C | 23.7°C | 20.3°C | 33.9°C | 17.9°C | 8 mm | 66% | 5.6 m/s | 8.2 |
| 2008 | 27.8°C | 23.9°C | 19.9°C | 34.2°C | 16.4°C | 0 mm | 62% | 5.7 m/s | 8.1 |
| 2007 | 24.7°C | 21.6°C | 18.5°C | 33.4°C | 15.7°C | 20 mm | 68% | 5.5 m/s | 8.1 |
| 2006 | 25.7°C | 21.9°C | 18.1°C | 33.1°C | 13.4°C | 47 mm | 68% | 5.9 m/s | 7.5 |
| 2005 | 25.9°C | 22.2°C | 18.5°C | 34.5°C | 15.3°C | 0 mm | 65% | 6.2 m/s | 8.7 |
| 2004 | 26.6°C | 22.9°C | 19.2°C | 34.5°C | 16.2°C | 1 mm | 67% | 5.5 m/s | 8.4 |
| 2003 | 26.6°C | 22.6°C | 18.7°C | 34.6°C | 15.2°C | 2 mm | 62% | 5.6 m/s | 8.5 |
| 2002 | 26.1°C | 22.5°C | 18.9°C | 32.8°C | 15.3°C | 13 mm | 63% | 5.4 m/s | 8.2 |
| 2001 | 24.9°C | 22.1°C | 19.4°C | 30.7°C | 16.0°C | 7 mm | 71% | 5.6 m/s | 7.9 |
| 2000 | 26.5°C | 23.2°C | 19.8°C | 32.6°C | 17.1°C | 83 mm | 66% | 5.4 m/s | 7.5 |
| 1999 | 26.4°C | 22.8°C | 19.2°C | 35.4°C | 15.2°C | 24 mm | 66% | 6 m/s | 8.1 |
| 1998 | 27.0°C | 23.2°C | 19.4°C | 36.3°C | 15.5°C | 3 mm | 64% | 5.3 m/s | 8.6 |
| 1997 | 28.2°C | 24.1°C | 20.0°C | 34.6°C | 15.8°C | 1 mm | 60% | 5.5 m/s | 8.5 |
| 1996 | 26.6°C | 22.7°C | 18.8°C | 34.7°C | 14.8°C | 3 mm | 61% | 6.1 m/s | 8.6 |
| 1995 | 27.5°C | 23.8°C | 20.0°C | 33.7°C | 15.9°C | 2 mm | 64% | 5.9 m/s | 8.6 |
| 1994 | 25.7°C | 22.1°C | 18.5°C | 37.2°C | 15.3°C | 1 mm | 63% | 6.1 m/s | 8.7 |
| 1993 | 26.5°C | 23.0°C | 19.5°C | 33.4°C | 16.3°C | 2 mm | 65% | 5.5 m/s | 8.5 |
| 1992 | 28.3°C | 24.4°C | 20.5°C | 33.5°C | 16.5°C | 3 mm | 59% | 5 m/s | 7.9 |
| 1991 | 27.1°C | 23.2°C | 19.4°C | 37.4°C | 14.9°C | 3 mm | 61% | 5.6 m/s | 8.5 |
| 1990 | 24.9°C | 21.4°C | 17.9°C | 29.7°C | 13.8°C | 67 mm | 65% | 5.9 m/s | 7.7 |
| 1989 | 27.7°C | 23.8°C | 20.0°C | 36.8°C | 15.4°C | 13 mm | 59% | 5.5 m/s | 7.6 |
| 1988 | 25.3°C | 22.0°C | 18.7°C | 36.8°C | 14.2°C | 4 mm | 63% | 5.5 m/s | 8.2 |
| 1987 | 25.2°C | 21.7°C | 18.2°C | 30.6°C | 15.5°C | 2 mm | 64% | 5.7 m/s | 8.4 |
| 1986 | 28.3°C | 24.2°C | 20.0°C | 36.2°C | 16.1°C | 2 mm | 58% | 5.6 m/s | 8.6 |
| 1985 | 26.0°C | 22.2°C | 18.5°C | 35.6°C | 15.1°C | 4 mm | 63% | 5.8 m/s | 8.7 |
| 1984 | 27.5°C | 23.5°C | 19.4°C | 36.0°C | 15.9°C | 0 mm | 59% | 5.6 m/s | 8.3 |
| 1983 | 27.2°C | 23.4°C | 19.5°C | 35.8°C | 16.0°C | 1 mm | 60% | 5.6 m/s | — |
| 1982 ❄️ 🌧️ | 24.7°C | 21.4°C | 18.1°C | 33.4°C | 15.5°C | 96 mm | 68% | 5.7 m/s | — |
| 1981 | 28.5°C | 23.8°C | 19.0°C | 37.9°C | 15.9°C | 1 mm | 56% | 6 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 26.8°C with lows near 19.5°C (mean 23.2°C), based on 45 years of NASA POWER data.
January averages 16 mm of rainfall in Perth, one of the drier months. The wettest on record was 96 mm in 1982.
The hottest January reached 39.1°C in 2025. The coldest dipped to 13.4°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1.3°C. Daytime highs moved from 26.8°C to 27.9°C and overnight lows from 18.9°C to 20.5°C over the same span.
January is one of the warmer months of the year in Perth and one of the drier months, so plan for around 26.8°C daytime highs and 19.5°C at night.
Not quite — January is the 11th coolest month in Perth, averaging 23.2°C.
For January in Perth, pack light layers you can adjust through the day, with typical highs of 26.8°C and lows of 19.5°C.
Relative humidity in January averages 63% — moderately humid.
Average wind speed in January is 5.6 m/s. The windiest January on record averaged 6.2 m/s (2005).
The wettest January on record was 1982 with 96 mm. On average, January sees 16 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 January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
