January is one of the warmer months of the year in Wonthaggi, with average highs near 23.5°C and lows around 14.5°C (mean 19°C). It is one of the drier months, averaging 57 mm of rainfall and 68% relative humidity across the period.
January is one of the warmer months of the year in Wonthaggi. Across 45 years of records, the warmest January in Wonthaggi was 1981 — when the month averaged 21.2°C — while the coldest was 1992 at 15.9°C. Typical January days reach 23.5°C with nights near 14.5°C. The long-term trend is warming, about 0.4°C per decade.
January is one of the drier months in Wonthaggi, averaging 57 mm of rainfall. The wettest January on record was 1991 with 133 mm, while the driest was 1990 at 6 mm.
Relative humidity in Wonthaggi during January averages 68%. The most humid January was 2024 at 75%, and the least humid was 1982 at 62%.
January receives about 6.9 kWh/m²/day of solar energy in Wonthaggi. The sunniest January was 2009 at 7.9 kWh/m²/day, and the cloudiest were 2002, 2016 and 2020 at 6.3.
Average wind speed in Wonthaggi during January is 1.5 m/s. The windiest Januarys were 1986, 1992 and 1994, among others at 1.7 m/s, while the calmest were 1995, 2011 and 2023, among others at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.4°C | 18.5°C | 19.0°C | 19.5°C | 19.6°C | +1.2°C |
| Avg High | 22.9°C | 22.9°C | 23.5°C | 24.1°C | 24.0°C | +1.1°C |
| Avg Low | 13.9°C | 14.1°C | 14.4°C | 15.0°C | 15.2°C | +1.3°C |
| Avg Rain | 57 mm | 62 mm | 43 mm | 50 mm | 84 mm | +27 mm |
January temperatures in Wonthaggi have risen by about 1°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 9°C (1992) to a record high of 38.9°C (2009).
Rainfall in January is one of the drier months, averaging 57 mm, with a wettest year of 133 mm.
One of the best times to visit Wonthaggi
January is one of the best times to visit Wonthaggi. Expect days averaging 23.5°C and nights around 14.5°C (mean 19°C) — warmer than Wonthaggi's yearly average — with moderate rainfall (57 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 | 24.8°C | 20.2°C | 15.5°C | 34.6°C | 11.3°C | 45 mm | 66% | 1.5 m/s | 7.1 |
| 2024 | 23.2°C | 19.3°C | 15.4°C | 28.9°C | 12.5°C | 109 mm | 75% | 1.4 m/s | 6.6 |
| 2023 | 24.7°C | 20.0°C | 15.2°C | 33.5°C | 12.3°C | 21 mm | 68% | 1.3 m/s | 7.1 |
| 2022 | 25.4°C | 21.0°C | 16.6°C | 31.5°C | 14.0°C | 92 mm | 73% | 1.4 m/s | 6.9 |
| 2021 | 22.0°C | 18.2°C | 14.3°C | 32.9°C | 10.7°C | 126 mm | 72% | 1.6 m/s | 6.8 |
| 2020 | 23.7°C | 19.1°C | 14.4°C | 37.4°C | 12.2°C | 111 mm | 70% | 1.4 m/s | 6.3 |
| 2019 | 25.8°C | 20.8°C | 15.7°C | 35.9°C | 13.2°C | 10 mm | 67% | 1.4 m/s | 7.4 |
| 2018 | 25.0°C | 20.4°C | 15.8°C | 35.4°C | 12.6°C | 60 mm | 67% | 1.4 m/s | 7.2 |
| 2017 | 23.8°C | 19.3°C | 14.8°C | 33.9°C | 11.7°C | 41 mm | 67% | 1.5 m/s | 7 |
| 2016 | 23.5°C | 19.4°C | 15.2°C | 37.8°C | 11.3°C | 106 mm | 71% | 1.4 m/s | 6.3 |
| 2015 | 23.3°C | 18.8°C | 14.4°C | 34.9°C | 11.7°C | 56 mm | 69% | 1.6 m/s | 6.7 |
| 2014 | 24.8°C | 19.9°C | 15.0°C | 38.9°C | 10.8°C | 31 mm | 62% | 1.6 m/s | 7.4 |
| 2013 | 23.7°C | 18.9°C | 14.1°C | 35.4°C | 11.3°C | 23 mm | 64% | 1.5 m/s | 7.3 |
| 2012 | 24.0°C | 19.7°C | 15.3°C | 35.0°C | 12.7°C | 65 mm | 67% | 1.6 m/s | 7.1 |
| 2011 | 23.5°C | 19.4°C | 15.3°C | 31.4°C | 10.4°C | 69 mm | 73% | 1.3 m/s | 6.6 |
| 2010 | 23.6°C | 18.8°C | 14.0°C | 38.5°C | 11.6°C | 39 mm | 66% | 1.5 m/s | 7.2 |
| 2009 | 24.0°C | 19.0°C | 13.9°C | 38.9°C | 10.6°C | 9 mm | 63% | 1.4 m/s | 7.9 |
| 2008 | 24.2°C | 19.7°C | 15.1°C | 35.0°C | 12.2°C | 22 mm | 67% | 1.4 m/s | 7.5 |
| 2007 | 24.2°C | 19.6°C | 15.0°C | 36.8°C | 11.7°C | 39 mm | 67% | 1.4 m/s | 6.5 |
| 2006 | 24.1°C | 19.4°C | 14.8°C | 36.7°C | 11.7°C | 60 mm | 70% | 1.4 m/s | 7 |
| 2005 | 23.0°C | 18.8°C | 14.5°C | 32.5°C | 12.0°C | 54 mm | 69% | 1.5 m/s | 7.1 |
| 2004 | 21.1°C | 17.1°C | 13.1°C | 30.9°C | 9.1°C | 57 mm | 69% | 1.6 m/s | 6.9 |
| 2003 | 24.2°C | 19.1°C | 14.1°C | 37.6°C | 11.0°C | 25 mm | 63% | 1.6 m/s | 7 |
| 2002 | 21.9°C | 17.8°C | 13.8°C | 33.1°C | 11.1°C | 63 mm | 72% | 1.6 m/s | 6.3 |
| 2001 | 26.1°C | 21.0°C | 15.8°C | 35.4°C | 13.2°C | 29 mm | 65% | 1.4 m/s | 6.7 |
| 2000 | 22.5°C | 18.2°C | 13.9°C | 31.5°C | 10.0°C | 75 mm | 69% | 1.6 m/s | 6.6 |
| 1999 | 23.9°C | 19.6°C | 15.3°C | 31.3°C | 12.6°C | 37 mm | 74% | 1.4 m/s | 7.1 |
| 1998 | 23.9°C | 19.3°C | 14.7°C | 34.9°C | 11.9°C | 75 mm | 70% | 1.5 m/s | 6.9 |
| 1997 | 24.9°C | 19.6°C | 14.3°C | 36.0°C | 10.9°C | 48 mm | 63% | 1.5 m/s | 7.3 |
| 1996 | 22.5°C | 18.1°C | 13.6°C | 31.9°C | 11.1°C | 54 mm | 70% | 1.5 m/s | 6.8 |
| 1995 | 24.4°C | 19.8°C | 15.3°C | 32.3°C | 10.1°C | 75 mm | 70% | 1.3 m/s | 6.6 |
| 1994 | 21.2°C | 16.7°C | 12.2°C | 33.9°C | 9.7°C | 60 mm | 70% | 1.7 m/s | 6.8 |
| 1993 | 22.8°C | 18.5°C | 14.2°C | 33.8°C | 10.5°C | 105 mm | 74% | 1.3 m/s | 6.7 |
| 1992 ❄️ | 19.3°C | 15.9°C | 12.5°C | 31.6°C | 9.0°C | 29 mm | 73% | 1.7 m/s | 6.6 |
| 1991 🌧️ | 22.8°C | 18.8°C | 14.8°C | 36.3°C | 11.6°C | 133 mm | 70% | 1.6 m/s | 6.8 |
| 1990 | 23.6°C | 19.0°C | 14.3°C | 33.2°C | 10.0°C | 6 mm | 63% | 1.6 m/s | 7.3 |
| 1989 | 22.7°C | 18.3°C | 13.8°C | 33.5°C | 10.5°C | 65 mm | 68% | 1.5 m/s | 7.1 |
| 1988 | 25.0°C | 20.1°C | 15.2°C | 35.1°C | 12.3°C | 61 mm | 65% | 1.3 m/s | 7.4 |
| 1987 | 21.0°C | 16.7°C | 12.5°C | 31.2°C | 9.9°C | 63 mm | 69% | 1.6 m/s | 6.8 |
| 1986 | 20.9°C | 16.9°C | 12.9°C | 30.3°C | 10.6°C | 51 mm | 70% | 1.7 m/s | 7.1 |
| 1985 | 21.5°C | 17.4°C | 13.3°C | 35.6°C | 10.8°C | 25 mm | 65% | 1.7 m/s | 7 |
| 1984 | 21.6°C | 17.7°C | 13.8°C | 28.7°C | 10.8°C | 77 mm | 68% | 1.7 m/s | 6.4 |
| 1983 | 21.5°C | 17.0°C | 12.6°C | 31.8°C | 10.4°C | 47 mm | 64% | 1.7 m/s | — |
| 1982 | 25.2°C | 20.1°C | 15.0°C | 38.6°C | 11.7°C | 55 mm | 62% | 1.5 m/s | — |
| 1981 🔥 | 26.8°C | 21.2°C | 15.7°C | 36.5°C | 12.6°C | 69 mm | 65% | 1.4 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 23.5°C with lows near 14.5°C (mean 19°C), based on 45 years of NASA POWER data.
January averages 57 mm of rainfall in Wonthaggi, one of the drier months. The wettest on record was 133 mm in 1991.
The hottest January reached 38.9°C in 2009. The coldest dipped to 9°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1°C. Daytime highs moved from 23.3°C to 24°C and overnight lows from 14.1°C to 15.4°C over the same span.
January is one of the warmer months of the year in Wonthaggi and one of the drier months, so plan for around 23.5°C daytime highs and 14.5°C at night.
Not quite — January is the 11th coolest month in Wonthaggi, averaging 19°C.
For January in Wonthaggi, pack light layers you can adjust through the day, with typical highs of 23.5°C and lows of 14.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 68% — moderately humid.
Average wind speed in January is 1.5 m/s. The windiest January on record averaged 1.7 m/s (1983).
The wettest January on record was 1991 with 133 mm. On average, January sees 57 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 Wonthaggi 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.
