December is one of the warmer months of the year in Port Augusta, with average highs near 32.2°C and lows around 16.6°C (mean 24.4°C). It is about average for rainfall, averaging 20 mm of rainfall and 42% relative humidity across the period.
December is one of the warmer months of the year in Port Augusta. Across 45 years of records, the warmest December in Port Augusta was 2019 — when the month averaged 28°C — while the coldest was 2001 at 21.2°C. Typical December days reach 32.2°C with nights near 16.6°C. The long-term trend is warming, about 0.4°C per decade.
December is about average for rainfall in Port Augusta, averaging 20 mm of rainfall. The wettest December on record was 1992 with 112 mm, while the driest were 2016, 2017 and 2018 at 0 mm.
Relative humidity in Port Augusta during December averages 42%. The most humid December was 1992 at 60%, and the least humid was 2015 at 32%.
December receives about 8 kWh/m²/day of solar energy in Port Augusta. The sunniest December was 2012 at 8.7 kWh/m²/day, and the cloudiest was 1992 at 6.7.
Average wind speed in Port Augusta during December is 4.1 m/s. The windiest December was 2023 at 4.6 m/s, while the calmest was 2015 at 3.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.1°C | 23.6°C | 24.2°C | 25.5°C | 24.6°C | +0.5°C |
| Avg High | 32.0°C | 31.2°C | 32.1°C | 33.4°C | 32.4°C | +0.4°C |
| Avg Low | 16.2°C | 16.1°C | 16.4°C | 17.7°C | 16.9°C | +0.7°C |
| Avg Rain | 13 mm | 33 mm | 25 mm | 14 mm | 12 mm | -1 mm |
December temperatures in Port Augusta have risen by about 0.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 8.8°C (1995) to a record high of 47.7°C (2019).
Rainfall in December is about average for rainfall, averaging 20 mm, with a wettest year of 112 mm.
One of the best times to visit Port Augusta
December is one of the best times to visit Port Augusta. Expect days averaging 32.2°C and nights around 16.6°C (mean 24.4°C) — warmer than Port Augusta's yearly average — with low rainfall (20 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 | 33.8°C | 25.5°C | 17.3°C | 43.0°C | 11.3°C | 10 mm | 35% | 4.2 m/s | — |
| 2024 | 33.4°C | 25.5°C | 17.6°C | 42.2°C | 13.4°C | 13 mm | 42% | 3.9 m/s | 8.2 |
| 2023 | 32.3°C | 24.6°C | 16.9°C | 44.7°C | 13.0°C | 11 mm | 44% | 4.6 m/s | 7.6 |
| 2022 | 31.6°C | 24.1°C | 16.5°C | 41.2°C | 11.0°C | 18 mm | 44% | 4.1 m/s | 8.1 |
| 2021 | 32.3°C | 24.5°C | 16.7°C | 40.8°C | 10.0°C | 8 mm | 40% | 4.1 m/s | 8.4 |
| 2020 | 30.8°C | 23.5°C | 16.2°C | 39.0°C | 11.7°C | 12 mm | 41% | 4.5 m/s | 7.9 |
| 2019 🔥 | 36.4°C | 28.0°C | 19.6°C | 47.7°C | 10.6°C | 2 mm | 34% | 4.2 m/s | 8.2 |
| 2018 | 34.7°C | 26.8°C | 18.9°C | 45.1°C | 12.9°C | 0 mm | 37% | 4.3 m/s | 7.6 |
| 2017 | 32.9°C | 25.2°C | 17.5°C | 45.0°C | 12.1°C | 0 mm | 40% | 4.2 m/s | 7.7 |
| 2016 | 33.7°C | 26.0°C | 18.3°C | 42.7°C | 11.7°C | 0 mm | 41% | 4.2 m/s | 7.6 |
| 2015 | 35.3°C | 27.3°C | 19.3°C | 44.8°C | 11.3°C | 17 mm | 32% | 3.6 m/s | 8.1 |
| 2014 | 32.4°C | 24.6°C | 16.8°C | 38.6°C | 13.7°C | 15 mm | 43% | 4 m/s | 8.3 |
| 2013 | 33.3°C | 25.2°C | 17.1°C | 43.9°C | 11.2°C | 17 mm | 38% | 3.8 m/s | 7.7 |
| 2012 | 32.9°C | 25.0°C | 17.1°C | 41.5°C | 11.4°C | 7 mm | 38% | 4.2 m/s | 8.7 |
| 2011 | 31.7°C | 24.2°C | 16.6°C | 41.7°C | 11.1°C | 37 mm | 43% | 3.9 m/s | 8 |
| 2010 | 30.4°C | 23.1°C | 15.8°C | 42.7°C | 11.1°C | 41 mm | 48% | 3.9 m/s | 7.9 |
| 2009 | 32.1°C | 24.2°C | 16.2°C | 41.4°C | 11.4°C | 8 mm | 42% | 3.9 m/s | 8.6 |
| 2008 | 29.9°C | 22.9°C | 15.9°C | 36.1°C | 11.4°C | 67 mm | 50% | 3.7 m/s | 7.5 |
| 2007 | 33.0°C | 25.1°C | 17.2°C | 42.1°C | 12.3°C | 35 mm | 39% | 4 m/s | 8.1 |
| 2006 | 32.3°C | 24.5°C | 16.7°C | 42.5°C | 10.3°C | 26 mm | 36% | 4.2 m/s | 8.1 |
| 2005 | 33.2°C | 24.6°C | 16.0°C | 44.4°C | 10.1°C | 17 mm | 41% | 4.1 m/s | 8.3 |
| 2004 | 30.8°C | 23.3°C | 15.9°C | 40.4°C | 11.5°C | 32 mm | 44% | 4.1 m/s | 8.2 |
| 2003 | 34.0°C | 25.8°C | 17.6°C | 43.4°C | 11.9°C | 21 mm | 40% | 3.9 m/s | 8.1 |
| 2002 | 33.2°C | 25.0°C | 16.9°C | 43.5°C | 11.1°C | 8 mm | 35% | 4.3 m/s | 8 |
| 2001 ❄️ | 28.4°C | 21.2°C | 14.0°C | 37.9°C | 10.7°C | 21 mm | 51% | 4.1 m/s | 7.7 |
| 2000 | 33.6°C | 25.8°C | 17.9°C | 42.7°C | 12.2°C | 14 mm | 39% | 3.9 m/s | 8 |
| 1999 | 30.1°C | 23.0°C | 16.0°C | 39.9°C | 11.5°C | 28 mm | 44% | 4.4 m/s | 7.8 |
| 1998 | 32.3°C | 24.4°C | 16.6°C | 41.6°C | 11.7°C | 14 mm | 43% | 4 m/s | 8.2 |
| 1997 | 32.9°C | 24.9°C | 16.9°C | 39.9°C | 12.7°C | 47 mm | 46% | 3.7 m/s | 8.3 |
| 1996 | 31.4°C | 23.6°C | 15.7°C | 41.7°C | 11.0°C | 14 mm | 41% | 4.3 m/s | 7.8 |
| 1995 | 30.6°C | 22.9°C | 15.3°C | 42.7°C | 8.8°C | 26 mm | 41% | 4 m/s | 7.8 |
| 1994 | 34.5°C | 26.0°C | 17.5°C | 44.3°C | 11.4°C | 4 mm | 34% | 4.2 m/s | 8.4 |
| 1993 | 29.6°C | 22.8°C | 16.0°C | 36.8°C | 10.5°C | 58 mm | 47% | 4.1 m/s | 7.3 |
| 1992 🌧️ | 28.1°C | 21.8°C | 15.4°C | 35.9°C | 12.0°C | 112 mm | 60% | 4 m/s | 6.7 |
| 1991 | 30.7°C | 23.0°C | 15.3°C | 41.7°C | 10.7°C | 2 mm | 44% | 4.3 m/s | 8.2 |
| 1990 | 31.9°C | 24.0°C | 16.1°C | 40.8°C | 11.3°C | 25 mm | 43% | 4.2 m/s | 8.1 |
| 1989 | 33.0°C | 24.8°C | 16.6°C | 44.2°C | 11.4°C | 13 mm | 40% | 4 m/s | 8.4 |
| 1988 | 32.3°C | 24.8°C | 17.2°C | 40.8°C | 12.0°C | 21 mm | 46% | 4.4 m/s | 7.6 |
| 1987 | 32.0°C | 24.2°C | 16.4°C | 42.0°C | 10.0°C | 9 mm | 39% | 4.4 m/s | 7.9 |
| 1986 | 29.4°C | 22.2°C | 15.0°C | 40.4°C | 9.5°C | 16 mm | 46% | 4.4 m/s | 8.3 |
| 1985 | 29.7°C | 21.8°C | 13.9°C | 39.0°C | 11.4°C | 14 mm | 44% | 4.4 m/s | 8 |
| 1984 | 32.4°C | 24.2°C | 16.0°C | 41.4°C | 10.1°C | 3 mm | 37% | 4 m/s | 7.6 |
| 1983 | 33.4°C | 25.6°C | 17.7°C | 42.2°C | 10.3°C | 22 mm | 40% | 3.7 m/s | — |
| 1982 | 32.9°C | 25.0°C | 17.1°C | 41.3°C | 10.8°C | 12 mm | 37% | 4.2 m/s | — |
| 1981 | 32.5°C | 24.1°C | 15.8°C | 42.5°C | 10.7°C | 5 mm | 38% | 4.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 32.2°C with lows near 16.6°C (mean 24.4°C), based on 45 years of NASA POWER data.
December averages 20 mm of rainfall in Port Augusta, about average for rainfall. The wettest on record was 112 mm in 1992.
The hottest December reached 47.7°C in 2019. The coldest dipped to 8.8°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.7°C. Daytime highs moved from 32.2°C to 32.7°C and overnight lows from 16.1°C to 17°C over the same span.
December is one of the warmer months of the year in Port Augusta and about average for rainfall, so plan for around 32.2°C daytime highs and 16.6°C at night.
Not quite — December is the 10th coolest month in Port Augusta, averaging 24.4°C.
For December in Port Augusta, pack light, breathable clothing and sun protection, with typical highs of 32.2°C and lows of 16.6°C.
Relative humidity in December averages 42% — relatively dry.
Average wind speed in December is 4.1 m/s. The windiest December on record averaged 4.6 m/s (2023).
The wettest December on record was 1992 with 112 mm. On average, December sees 20 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 Port Augusta 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.
