January is one of the warmer months of the year in Whyalla, with average highs near 30.6°C and lows around 19.1°C (mean 24.9°C). It is about average for rainfall, averaging 18 mm of rainfall and 49% relative humidity across the period.
January is one of the warmer months of the year in Whyalla. Across 45 years of records, the warmest January in Whyalla was 2001 — when the month averaged 28.8°C — while the coldest was 1992 at 21.1°C. Typical January days reach 30.6°C with nights near 19.1°C. The long-term trend is warming, about 0.5°C per decade.
January is about average for rainfall in Whyalla, averaging 18 mm of rainfall. The wettest January on record was 1993 with 86 mm, while the driest were 2017, 2018 and 2019 at 0 mm.
Relative humidity in Whyalla during January averages 49%. The most humid January was 1993 at 62%, and the least humid was 2001 at 43%.
January receives about 7.9 kWh/m²/day of solar energy in Whyalla. The sunniest January was 2009 at 8.8 kWh/m²/day, and the cloudiest were 2018 and 2022 at 7.3.
Average wind speed in Whyalla during January is 4.6 m/s. The windiest January was 1989 at 5.1 m/s, while the calmest were 1993 and 2011 at 4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.1°C | 23.9°C | 25.1°C | 26.0°C | 25.3°C | +1.2°C |
| Avg High | 30.1°C | 29.6°C | 31.1°C | 31.6°C | 30.8°C | +0.7°C |
| Avg Low | 18.1°C | 18.2°C | 19.2°C | 20.3°C | 19.9°C | +1.8°C |
| Avg Rain | 12 mm | 26 mm | 17 mm | 15 mm | 18 mm | +6 mm |
January temperatures in Whyalla have risen by about 0.7°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 12.7°C (1996) to a record high of 44.3°C (2019).
Rainfall in January is about average for rainfall, averaging 18 mm, with a wettest year of 86 mm.
A good time to visit Whyalla
January is a good time to visit Whyalla, with days averaging 30.6°C and nights around 19.1°C (mean 24.9°C, warmer than Whyalla's yearly average) and low rainfall. March and December are marginally more temperate, but January still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 32.0°C | 26.1°C | 20.2°C | 38.6°C | 17.2°C | 2 mm | 45% | 4.6 m/s | 8.2 |
| 2024 | 31.5°C | 26.1°C | 20.7°C | 43.0°C | 15.8°C | 22 mm | 52% | 4.1 m/s | 7.5 |
| 2023 | 31.1°C | 25.5°C | 19.8°C | 39.2°C | 15.3°C | 21 mm | 51% | 4.5 m/s | 7.7 |
| 2022 | 30.1°C | 25.3°C | 20.5°C | 36.3°C | 16.5°C | 27 mm | 58% | 4.4 m/s | 7.3 |
| 2021 | 29.6°C | 24.2°C | 18.8°C | 39.4°C | 15.5°C | 33 mm | 52% | 4.7 m/s | 7.8 |
| 2020 | 30.3°C | 24.8°C | 19.2°C | 42.4°C | 14.8°C | 4 mm | 49% | 4.8 m/s | 7.8 |
| 2019 | 33.7°C | 27.6°C | 21.5°C | 44.3°C | 17.5°C | 0 mm | 44% | 4.4 m/s | 7.9 |
| 2018 | 32.7°C | 27.0°C | 21.2°C | 42.1°C | 16.9°C | 0 mm | 45% | 4.7 m/s | 7.3 |
| 2017 | 32.0°C | 26.2°C | 20.4°C | 40.0°C | 16.5°C | 0 mm | 49% | 4.3 m/s | 7.6 |
| 2016 | 31.0°C | 25.7°C | 20.3°C | 38.5°C | 15.7°C | 27 mm | 51% | 4.6 m/s | 7.7 |
| 2015 | 29.3°C | 24.2°C | 19.2°C | 39.7°C | 15.2°C | 47 mm | 56% | 4.6 m/s | 7.4 |
| 2014 | 32.8°C | 26.7°C | 20.6°C | 41.4°C | 14.7°C | 19 mm | 46% | 4.5 m/s | 8 |
| 2013 | 31.1°C | 25.2°C | 19.2°C | 43.1°C | 15.4°C | 3 mm | 46% | 5 m/s | 8.2 |
| 2012 | 30.4°C | 25.1°C | 19.9°C | 39.4°C | 14.9°C | 33 mm | 51% | 4.5 m/s | 7.8 |
| 2011 | 31.7°C | 26.1°C | 20.6°C | 41.9°C | 16.4°C | 5 mm | 51% | 4 m/s | 7.9 |
| 2010 | 31.7°C | 25.8°C | 19.9°C | 41.2°C | 15.2°C | 15 mm | 45% | 4.4 m/s | 8.4 |
| 2009 | 32.3°C | 25.9°C | 19.4°C | 42.2°C | 13.7°C | 9 mm | 44% | 4.2 m/s | 8.8 |
| 2008 | 31.5°C | 25.4°C | 19.2°C | 40.2°C | 16.0°C | 3 mm | 50% | 4.8 m/s | 8.6 |
| 2007 | 30.0°C | 24.6°C | 19.3°C | 38.7°C | 15.5°C | 84 mm | 55% | 4.5 m/s | 7.6 |
| 2006 | 32.6°C | 26.9°C | 21.2°C | 42.5°C | 17.6°C | 10 mm | 51% | 4.7 m/s | 7.5 |
| 2005 | 30.4°C | 24.4°C | 18.5°C | 39.5°C | 14.5°C | 18 mm | 50% | 4.7 m/s | 7.6 |
| 2004 | 27.5°C | 22.3°C | 17.2°C | 37.1°C | 14.4°C | 7 mm | 55% | 4.9 m/s | 8 |
| 2003 | 31.9°C | 25.5°C | 19.1°C | 43.0°C | 14.4°C | 10 mm | 43% | 4.8 m/s | 7.9 |
| 2002 | 28.8°C | 23.0°C | 17.3°C | 39.5°C | 13.7°C | 12 mm | 50% | 4.4 m/s | 7.7 |
| 2001 🔥 | 35.2°C | 28.8°C | 22.4°C | 43.1°C | 17.9°C | 15 mm | 43% | 4.3 m/s | 8.3 |
| 2000 | 30.3°C | 24.6°C | 18.8°C | 40.7°C | 12.7°C | 2 mm | 45% | 4.5 m/s | 7.7 |
| 1999 | 32.4°C | 26.5°C | 20.5°C | 40.2°C | 15.4°C | 25 mm | 49% | 4.5 m/s | 8 |
| 1998 | 29.8°C | 24.4°C | 18.9°C | 39.1°C | 15.7°C | 14 mm | 53% | 4.7 m/s | 8.1 |
| 1997 | 30.4°C | 24.6°C | 18.8°C | 37.4°C | 14.8°C | 46 mm | 48% | 4.5 m/s | 7.9 |
| 1996 | 28.7°C | 22.7°C | 16.7°C | 40.1°C | 12.7°C | 3 mm | 52% | 5 m/s | 8.1 |
| 1995 | 30.3°C | 24.4°C | 18.4°C | 38.1°C | 13.5°C | 51 mm | 51% | 4.2 m/s | 7.8 |
| 1994 | 28.4°C | 22.5°C | 16.7°C | 38.8°C | 14.1°C | 5 mm | 52% | 5 m/s | 8.4 |
| 1993 🌧️ | 29.1°C | 23.7°C | 18.2°C | 37.8°C | 13.9°C | 86 mm | 62% | 4 m/s | 7.5 |
| 1992 ❄️ | 26.1°C | 21.1°C | 16.2°C | 36.5°C | 13.0°C | 7 mm | 55% | 5 m/s | 8 |
| 1991 | 31.4°C | 25.3°C | 19.2°C | 40.1°C | 15.2°C | 9 mm | 48% | 4.3 m/s | 8.3 |
| 1990 | 29.8°C | 24.0°C | 18.3°C | 41.4°C | 14.4°C | 11 mm | 51% | 4.7 m/s | 7.8 |
| 1989 | 29.1°C | 23.5°C | 17.8°C | 37.1°C | 13.7°C | 1 mm | 48% | 5.1 m/s | 8.3 |
| 1988 | 31.4°C | 25.0°C | 18.6°C | 40.8°C | 14.9°C | 3 mm | 44% | 4.5 m/s | 7.9 |
| 1987 | 28.1°C | 22.1°C | 16.1°C | 38.0°C | 13.6°C | 37 mm | 51% | 4.4 m/s | 8 |
| 1986 | 29.1°C | 22.8°C | 16.5°C | 41.1°C | 12.9°C | 1 mm | 47% | 4.7 m/s | 8.7 |
| 1985 | 30.2°C | 24.1°C | 18.0°C | 39.5°C | 14.3°C | 6 mm | 46% | 4.6 m/s | 8.2 |
| 1984 | 28.5°C | 23.2°C | 17.9°C | 37.6°C | 14.2°C | 10 mm | 51% | 4.8 m/s | 7.8 |
| 1983 | 29.7°C | 23.6°C | 17.5°C | 40.6°C | 12.9°C | 2 mm | 44% | 4.5 m/s | — |
| 1982 | 32.1°C | 25.8°C | 19.5°C | 42.0°C | 15.6°C | 7 mm | 44% | 4.4 m/s | — |
| 1981 | 33.1°C | 27.0°C | 20.8°C | 40.5°C | 17.0°C | 41 mm | 46% | 4.4 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 30.6°C with lows near 19.1°C (mean 24.9°C), based on 45 years of NASA POWER data.
January averages 18 mm of rainfall in Whyalla, about average for rainfall. The wettest on record was 86 mm in 1993.
The hottest January reached 44.3°C in 2019. The coldest dipped to 12.7°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.7°C. Daytime highs moved from 30.7°C to 30.9°C and overnight lows from 18.7°C to 20°C over the same span.
January is one of the warmer months of the year in Whyalla and about average for rainfall, so plan for around 30.6°C daytime highs and 19.1°C at night.
Not quite — January is the 12th coolest month in Whyalla, averaging 24.9°C.
For January in Whyalla, pack light, breathable clothing and sun protection, with typical highs of 30.6°C and lows of 19.1°C.
Relative humidity in January averages 49% — relatively dry.
Average wind speed in January is 4.6 m/s. The windiest January on record averaged 5.1 m/s (1989).
The wettest January on record was 1993 with 86 mm. On average, January sees 18 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 Whyalla 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.
