December is one of the warmer months of the year in Warrnambool, with average highs near 18.9°C and lows around 13.3°C (mean 16.1°C). It is one of the drier months, averaging 52 mm of rainfall and 74% relative humidity across the period.
December is one of the warmer months of the year in Warrnambool. Across 45 years of records, the warmest December in Warrnambool was 2015 — when the month averaged 17.8°C — while the coldest was 1995 at 14°C. Typical December days reach 18.9°C with nights near 13.3°C. The long-term trend is warming, about 0.2°C per decade.
December is one of the drier months in Warrnambool, averaging 52 mm of rainfall. The wettest December on record was 1985 with 135 mm, while the driest was 2021 at 14 mm.
Relative humidity in Warrnambool during December averages 74%. The most humid December was 1992 at 82%, and the least humid was 2015 at 68%.
December receives about 6.9 kWh/m²/day of solar energy in Warrnambool. The sunniest December was 2021 at 7.8 kWh/m²/day, and the cloudiest was 1992 at 5.6.
Average wind speed in Warrnambool during December is 5.2 m/s. The windiest December was 2005 at 6.3 m/s, while the calmest was 1983 at 4.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.9°C | 15.7°C | 16.2°C | 16.6°C | 16.1°C | +0.2°C |
| Avg High | 18.8°C | 18.3°C | 19.1°C | 19.5°C | 18.8°C | 0°C |
| Avg Low | 13.0°C | 13.0°C | 13.4°C | 13.7°C | 13.3°C | +0.3°C |
| Avg Rain | 56 mm | 49 mm | 51 mm | 50 mm | 56 mm | 0 mm |
December temperatures in Warrnambool have risen by about 0.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 9.6°C (1994) to a record high of 34.8°C (2006).
Rainfall in December is one of the drier months, averaging 52 mm, with a wettest year of 135 mm.
One of the best times to visit Warrnambool
December is one of the best times to visit Warrnambool. Expect days averaging 18.9°C and nights around 13.3°C (mean 16.1°C) — warmer than Warrnambool's yearly average — with moderate rainfall (52 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 | 18.8°C | 15.7°C | 12.6°C | 30.9°C | 11.0°C | 31 mm | 71% | 5.4 m/s | — |
| 2024 | 20.5°C | 17.5°C | 14.5°C | 32.3°C | 13.2°C | 47 mm | 73% | 5.1 m/s | 7.1 |
| 2023 | 18.7°C | 16.4°C | 14.0°C | 27.2°C | 12.1°C | 102 mm | 78% | 5.5 m/s | 6.4 |
| 2022 | 19.0°C | 16.0°C | 13.0°C | 31.3°C | 10.7°C | 49 mm | 76% | 4.9 m/s | 7.3 |
| 2021 | 18.3°C | 15.7°C | 13.0°C | 26.6°C | 11.2°C | 14 mm | 75% | 5 m/s | 7.8 |
| 2020 | 17.6°C | 15.1°C | 12.6°C | 29.3°C | 11.0°C | 92 mm | 75% | 5.6 m/s | 6.6 |
| 2019 | 19.0°C | 16.1°C | 13.2°C | 34.7°C | 10.8°C | 19 mm | 74% | 5.6 m/s | 7.4 |
| 2018 | 20.5°C | 17.4°C | 14.4°C | 31.6°C | 12.1°C | 78 mm | 76% | 4.7 m/s | 6.9 |
| 2017 | 19.7°C | 17.2°C | 14.6°C | 30.5°C | 12.2°C | 33 mm | 74% | 5.1 m/s | 6.8 |
| 2016 | 19.5°C | 16.3°C | 13.1°C | 31.1°C | 10.8°C | 33 mm | 73% | 4.8 m/s | 7 |
| 2015 🔥 | 21.5°C | 17.8°C | 14.1°C | 33.0°C | 11.1°C | 67 mm | 68% | 4.9 m/s | 7.6 |
| 2014 | 18.7°C | 16.2°C | 13.7°C | 27.0°C | 12.1°C | 31 mm | 76% | 5 m/s | 6.8 |
| 2013 | 18.5°C | 15.6°C | 12.8°C | 29.9°C | 10.6°C | 47 mm | 77% | 4.9 m/s | 7.1 |
| 2012 | 19.2°C | 16.4°C | 13.6°C | 29.4°C | 11.9°C | 47 mm | 73% | 5.1 m/s | 7.1 |
| 2011 | 19.5°C | 16.6°C | 13.8°C | 26.2°C | 11.3°C | 24 mm | 75% | 4.8 m/s | 7.2 |
| 2010 | 18.8°C | 16.2°C | 13.5°C | 29.2°C | 11.3°C | 124 mm | 77% | 5.2 m/s | 7.1 |
| 2009 | 19.7°C | 16.7°C | 13.7°C | 31.2°C | 12.0°C | 54 mm | 72% | 4.8 m/s | 7.3 |
| 2008 | 17.2°C | 15.0°C | 12.7°C | 25.3°C | 10.4°C | 108 mm | 76% | 5.6 m/s | 6.7 |
| 2007 | 20.3°C | 17.1°C | 14.0°C | 31.9°C | 12.0°C | 64 mm | 74% | 4.7 m/s | 7 |
| 2006 | 19.0°C | 15.7°C | 12.5°C | 34.8°C | 10.7°C | 15 mm | 68% | 5 m/s | 7.6 |
| 2005 | 21.1°C | 17.6°C | 14.0°C | 29.6°C | 12.4°C | 38 mm | 68% | 6.3 m/s | 6.9 |
| 2004 | 19.3°C | 16.5°C | 13.7°C | 30.1°C | 12.0°C | 48 mm | 77% | 4.9 m/s | 7.1 |
| 2003 | 20.0°C | 16.9°C | 13.8°C | 32.0°C | 10.9°C | 38 mm | 73% | 5 m/s | 7.2 |
| 2002 | 18.8°C | 16.0°C | 13.2°C | 28.4°C | 10.9°C | 44 mm | 75% | 5.5 m/s | 6.5 |
| 2001 | 16.0°C | 14.1°C | 12.2°C | 24.6°C | 10.9°C | 66 mm | 78% | 5.3 m/s | 6 |
| 2000 | 19.4°C | 16.6°C | 13.8°C | 31.6°C | 11.5°C | 30 mm | 73% | 5.1 m/s | 7.7 |
| 1999 | 19.0°C | 16.4°C | 13.8°C | 29.5°C | 11.7°C | 53 mm | 73% | 5.8 m/s | 7 |
| 1998 | 19.4°C | 16.5°C | 13.5°C | 32.0°C | 11.7°C | 35 mm | 75% | 5.4 m/s | 6.7 |
| 1997 | 18.0°C | 15.6°C | 13.2°C | 25.5°C | 12.5°C | 20 mm | 77% | 5.4 m/s | 6.9 |
| 1996 | 17.1°C | 14.4°C | 11.6°C | 27.0°C | 10.2°C | 36 mm | 72% | 4.9 m/s | 7.1 |
| 1995 ❄️ | 16.2°C | 14.0°C | 11.8°C | 25.4°C | 10.5°C | 58 mm | 76% | 5.7 m/s | 6.5 |
| 1994 | 20.1°C | 16.9°C | 13.7°C | 32.1°C | 9.6°C | 39 mm | 72% | 4.6 m/s | 7.3 |
| 1993 | 17.8°C | 15.2°C | 12.6°C | 28.1°C | 10.1°C | 89 mm | 76% | 5.3 m/s | 6.5 |
| 1992 | 19.0°C | 16.3°C | 13.6°C | 25.9°C | 10.3°C | 78 mm | 82% | 5.1 m/s | 5.6 |
| 1991 | 17.4°C | 15.0°C | 12.6°C | 30.0°C | 10.3°C | 42 mm | 79% | 4.7 m/s | 6.5 |
| 1990 | 19.2°C | 16.3°C | 13.3°C | 27.5°C | 10.2°C | 37 mm | 76% | 5.6 m/s | 7 |
| 1989 | 19.4°C | 16.4°C | 13.4°C | 27.2°C | 11.3°C | 31 mm | 73% | 5.4 m/s | 7.5 |
| 1988 | 19.3°C | 16.4°C | 13.5°C | 30.1°C | 11.2°C | 42 mm | 76% | 4.7 m/s | 6.7 |
| 1987 | 18.1°C | 15.3°C | 12.5°C | 26.9°C | 10.2°C | 74 mm | 74% | 5 m/s | 6.5 |
| 1986 | 17.7°C | 14.9°C | 12.1°C | 27.8°C | 10.4°C | 107 mm | 75% | 5.5 m/s | 6.4 |
| 1985 🌧️ | 18.6°C | 16.1°C | 13.6°C | 25.1°C | 12.5°C | 135 mm | 79% | 5.5 m/s | 6.3 |
| 1984 | 18.1°C | 15.4°C | 12.7°C | 24.7°C | 11.0°C | 56 mm | 74% | 6.2 m/s | 6.7 |
| 1983 | 19.5°C | 16.5°C | 13.5°C | 29.8°C | 10.3°C | 18 mm | 73% | 4.3 m/s | — |
| 1982 | 18.8°C | 15.8°C | 12.7°C | 28.7°C | 10.8°C | 21 mm | 72% | 5.2 m/s | — |
| 1981 | 19.5°C | 16.4°C | 13.4°C | 30.4°C | 11.4°C | 20 mm | 72% | 5.2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 18.9°C with lows near 13.3°C (mean 16.1°C), based on 45 years of NASA POWER data.
December averages 52 mm of rainfall in Warrnambool, one of the drier months. The wettest on record was 135 mm in 1985.
The hottest December reached 34.8°C in 2006. The coldest dipped to 9.6°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.3°C. Daytime highs moved from 18.9°C to 19.1°C and overnight lows from 13.2°C to 13.4°C over the same span.
December is one of the warmer months of the year in Warrnambool and one of the drier months, so plan for around 18.9°C daytime highs and 13.3°C at night.
Not quite — December is the 9th coolest month in Warrnambool, averaging 16.1°C.
For December in Warrnambool, pack light layers you can adjust through the day, with typical highs of 18.9°C and lows of 13.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 74% — moderately humid.
Average wind speed in December is 5.2 m/s. The windiest December on record averaged 6.3 m/s (2005).
The wettest December on record was 1985 with 135 mm. On average, December sees 52 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 Warrnambool behaves each December, 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 December specifically, along with year-by-year records and how the month has changed over the decades.
