January is one of the warmer months of the year in Adelaide, with average highs near 29.3°C and lows around 15.4°C (mean 22.4°C). It is one of the drier months, averaging 16 mm of rainfall and 52% relative humidity across the period.
January is one of the warmer months of the year in Adelaide. Across 45 years of records, the warmest January in Adelaide was 2001 — when the month averaged 25.9°C — while the coldest was 1992 at 18.9°C. Typical January days reach 29.3°C with nights near 15.4°C. The long-term trend is warming, about 0.5°C per decade.
January is one of the drier months in Adelaide, averaging 16 mm of rainfall. The wettest January on record was 2015 with 51 mm, while the driest were 2017, 2018 and 2019 at 0 mm.
Relative humidity in Adelaide during January averages 52%. The most humid January was 1993 at 62%, and the least humid was 2001 at 43%.
January receives about 7.8 kWh/m²/day of solar energy in Adelaide. The sunniest January was 2009 at 8.8 kWh/m²/day, and the cloudiest was 1993 at 7.2.
Average wind speed in Adelaide during January is 3.3 m/s. The windiest January was 1994 at 3.8 m/s, while the calmest was 1993 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.7°C | 21.6°C | 22.4°C | 23.3°C | 22.9°C | +1.2°C |
| Avg High | 28.8°C | 28.5°C | 29.3°C | 30.4°C | 29.8°C | +1°C |
| Avg Low | 14.6°C | 14.8°C | 15.4°C | 16.3°C | 16.0°C | +1.4°C |
| Avg Rain | 14 mm | 19 mm | 17 mm | 15 mm | 18 mm | +4 mm |
January temperatures in Adelaide have risen by about 0.8°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 8.3°C (1987) to a record high of 45.2°C (2019).
Rainfall in January is one of the drier months, averaging 16 mm, with a wettest year of 51 mm.
One of the best times to visit Adelaide
January is one of the best times to visit Adelaide. Expect days averaging 29.3°C and nights around 15.4°C (mean 22.4°C) — warmer than Adelaide'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 | 31.0°C | 23.7°C | 16.4°C | 38.4°C | 11.9°C | 0 mm | 48% | 3.2 m/s | 8.2 |
| 2024 | 29.5°C | 22.8°C | 16.0°C | 39.2°C | 11.0°C | 41 mm | 56% | 3 m/s | 7.7 |
| 2023 | 29.7°C | 22.5°C | 15.3°C | 38.5°C | 11.1°C | 17 mm | 54% | 3.2 m/s | 7.8 |
| 2022 | 30.3°C | 24.1°C | 17.9°C | 39.8°C | 12.5°C | 27 mm | 56% | 3.2 m/s | 7.3 |
| 2021 | 29.0°C | 22.1°C | 15.2°C | 40.5°C | 12.5°C | 22 mm | 51% | 3.3 m/s | 7.9 |
| 2020 | 29.1°C | 22.3°C | 15.5°C | 42.5°C | 11.6°C | 1 mm | 50% | 3.3 m/s | 7.7 |
| 2019 | 32.7°C | 25.0°C | 17.3°C | 45.2°C | 12.9°C | 0 mm | 45% | 3.1 m/s | 8.1 |
| 2018 | 31.4°C | 24.3°C | 17.1°C | 41.4°C | 13.5°C | 0 mm | 47% | 3.4 m/s | 7.5 |
| 2017 | 30.9°C | 23.6°C | 16.3°C | 39.5°C | 12.1°C | 0 mm | 50% | 3.2 m/s | 7.8 |
| 2016 | 29.7°C | 23.0°C | 16.4°C | 37.4°C | 11.9°C | 17 mm | 52% | 3.3 m/s | 7.7 |
| 2015 🌧️ | 27.9°C | 21.8°C | 15.6°C | 39.4°C | 11.1°C | 51 mm | 57% | 3.4 m/s | 7.3 |
| 2014 | 31.6°C | 24.2°C | 16.8°C | 43.3°C | 11.0°C | 13 mm | 47% | 3.4 m/s | 8 |
| 2013 | 29.6°C | 22.4°C | 15.1°C | 42.7°C | 10.6°C | 15 mm | 49% | 3.3 m/s | 8.2 |
| 2012 | 30.0°C | 23.3°C | 16.6°C | 39.5°C | 11.8°C | 18 mm | 50% | 3.7 m/s | 7.8 |
| 2011 | 29.9°C | 22.9°C | 15.9°C | 40.4°C | 11.5°C | 14 mm | 55% | 2.9 m/s | 7.9 |
| 2010 | 29.9°C | 22.7°C | 15.4°C | 40.3°C | 11.6°C | 20 mm | 48% | 3.1 m/s | 8.4 |
| 2009 | 31.0°C | 23.4°C | 15.8°C | 44.4°C | 9.5°C | 1 mm | 46% | 3.1 m/s | 8.8 |
| 2008 | 29.6°C | 22.1°C | 14.6°C | 39.8°C | 11.5°C | 6 mm | 55% | 3.4 m/s | 8.6 |
| 2007 | 29.0°C | 22.7°C | 16.3°C | 38.7°C | 12.0°C | 50 mm | 56% | 3.4 m/s | 7.5 |
| 2006 | 30.8°C | 23.7°C | 16.6°C | 42.1°C | 12.0°C | 25 mm | 54% | 3.4 m/s | 7.5 |
| 2005 | 28.7°C | 21.8°C | 14.9°C | 40.1°C | 9.8°C | 21 mm | 53% | 3.2 m/s | 7.6 |
| 2004 | 25.0°C | 19.3°C | 13.5°C | 37.8°C | 10.6°C | 11 mm | 59% | 3.3 m/s | 8 |
| 2003 | 30.4°C | 22.9°C | 15.4°C | 43.3°C | 11.3°C | 16 mm | 46% | 3.6 m/s | 8 |
| 2002 | 26.8°C | 20.1°C | 13.5°C | 38.6°C | 9.6°C | 21 mm | 56% | 3.3 m/s | 7.6 |
| 2001 🔥 | 33.7°C | 25.9°C | 18.1°C | 43.1°C | 12.7°C | 8 mm | 43% | 3.3 m/s | 8 |
| 2000 | 28.2°C | 21.8°C | 15.4°C | 38.6°C | 9.2°C | 7 mm | 50% | 3.6 m/s | 7.7 |
| 1999 | 32.1°C | 24.4°C | 16.6°C | 41.0°C | 12.1°C | 12 mm | 50% | 3.4 m/s | 8 |
| 1998 | 28.8°C | 21.8°C | 14.8°C | 37.4°C | 11.3°C | 14 mm | 55% | 3.4 m/s | 7.8 |
| 1997 | 29.7°C | 22.4°C | 15.2°C | 37.6°C | 10.5°C | 37 mm | 50% | 3.2 m/s | 7.4 |
| 1996 | 27.5°C | 20.5°C | 13.5°C | 42.3°C | 11.0°C | 12 mm | 56% | 3.7 m/s | 8.2 |
| 1995 | 29.6°C | 22.6°C | 15.6°C | 37.2°C | 10.2°C | 27 mm | 51% | 3.4 m/s | 7.7 |
| 1994 | 25.8°C | 19.6°C | 13.5°C | 41.0°C | 9.0°C | 22 mm | 56% | 3.8 m/s | 7.7 |
| 1993 | 28.2°C | 21.6°C | 14.9°C | 38.1°C | 10.1°C | 35 mm | 62% | 2.7 m/s | 7.2 |
| 1992 ❄️ | 25.1°C | 18.9°C | 12.8°C | 37.6°C | 9.7°C | 4 mm | 57% | 3.5 m/s | 7.8 |
| 1991 | 29.2°C | 22.5°C | 15.8°C | 41.3°C | 11.6°C | 15 mm | 54% | 3.5 m/s | 7.7 |
| 1990 | 28.9°C | 21.9°C | 14.9°C | 39.5°C | 9.6°C | 12 mm | 50% | 3.5 m/s | 7.7 |
| 1989 | 28.2°C | 21.6°C | 14.9°C | 38.3°C | 9.8°C | 3 mm | 50% | 3.6 m/s | 8.2 |
| 1988 | 30.2°C | 22.9°C | 15.6°C | 40.4°C | 11.4°C | 16 mm | 47% | 3.2 m/s | 7.8 |
| 1987 | 25.8°C | 19.2°C | 12.7°C | 36.0°C | 8.3°C | 22 mm | 54% | 3.3 m/s | 7.9 |
| 1986 | 27.4°C | 20.1°C | 12.8°C | 39.0°C | 10.6°C | 5 mm | 52% | 3.4 m/s | 8.5 |
| 1985 | 29.0°C | 21.6°C | 14.2°C | 41.2°C | 10.3°C | 5 mm | 49% | 3.3 m/s | 7.7 |
| 1984 | 27.1°C | 20.6°C | 14.1°C | 35.8°C | 10.5°C | 14 mm | 54% | 3.4 m/s | 7.7 |
| 1983 | 28.1°C | 20.8°C | 13.6°C | 42.0°C | 9.9°C | 9 mm | 48% | 3.4 m/s | — |
| 1982 | 30.5°C | 23.4°C | 16.2°C | 43.8°C | 11.4°C | 20 mm | 47% | 3.3 m/s | — |
| 1981 | 32.6°C | 24.8°C | 17.0°C | 41.2°C | 12.7°C | 32 mm | 47% | 3.3 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 29.3°C with lows near 15.4°C (mean 22.4°C), based on 45 years of NASA POWER data.
January averages 16 mm of rainfall in Adelaide, one of the drier months. The wettest on record was 51 mm in 2015.
The hottest January reached 45.2°C in 2019. The coldest dipped to 8.3°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.8°C. Daytime highs moved from 29.5°C to 29.9°C and overnight lows from 15°C to 16.2°C over the same span.
January is one of the warmer months of the year in Adelaide and one of the drier months, so plan for around 29.3°C daytime highs and 15.4°C at night.
Not quite — January is the 11th coolest month in Adelaide, averaging 22.4°C.
For January in Adelaide, pack light layers you can adjust through the day, with typical highs of 29.3°C and lows of 15.4°C.
Relative humidity in January averages 52% — relatively dry.
Average wind speed in January is 3.3 m/s. The windiest January on record averaged 3.8 m/s (1994).
The wettest January on record was 2015 with 51 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 Adelaide 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.
