December is one of the cooler months of the year in Exmouth, with average highs near 9.6°C and lows around 7°C (mean 8.3°C). It is a relatively wet time of year, averaging 116 mm of rainfall and 88% relative humidity across the period.
December is one of the cooler months of the year in Exmouth. Across 45 years of records, the warmest December in Exmouth was 2015 — when the month averaged 11.6°C — while the coldest was 2010 at 4.1°C. Typical December days reach 9.6°C with nights near 7°C. The long-term trend is warming, about 0.3°C per decade.
December is a relatively wet time of year in Exmouth, averaging 116 mm of rainfall. The wettest December on record was 2020 with 223 mm, while the driest was 1991 at 34 mm.
Relative humidity in Exmouth during December averages 88%. The most humid December was 2002 at 91%, and the least humid was 1991 at 85%.
December receives about 0.6 kWh/m²/day of solar energy in Exmouth. The sunniest Decembers were 2001, 2008 and 2014 at 0.8 kWh/m²/day, and the cloudiest were 1998, 2002 and 2015 at 0.5.
Average wind speed in Exmouth during December is 6.2 m/s. The windiest December was 2015 at 7.8 m/s, while the calmest was 2016 at 4.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.2°C | 7.8°C | 8.1°C | 8.8°C | 9.0°C | +0.8°C |
| Avg High | 9.6°C | 9.2°C | 9.4°C | 10.1°C | 10.3°C | +0.7°C |
| Avg Low | 6.9°C | 6.4°C | 6.8°C | 7.4°C | 7.8°C | +0.9°C |
| Avg Rain | 112 mm | 111 mm | 101 mm | 121 mm | 147 mm | +35 mm |
December temperatures in Exmouth have risen by about 1.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -1.6°C (1996) to a record high of 14.2°C (1985).
Rainfall in December is a relatively wet time of year, averaging 116 mm, with a wettest year of 223 mm.
A quieter season to visit Exmouth
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Exmouth. That said, December — with days averaging 9.6°C and nights around 7°C (mean 8.3°C) and higher rainfall (116 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 10.6°C | 9.4°C | 8.2°C | 13.7°C | 3.2°C | 174 mm | 88% | 6.7 m/s | — |
| 2024 | 10.6°C | 9.4°C | 8.2°C | 14.1°C | 6.6°C | 78 mm | 89% | 6.1 m/s | 0.6 |
| 2023 | 11.2°C | 10.0°C | 8.8°C | 13.1°C | 2.4°C | 161 mm | 90% | 6.9 m/s | 0.6 |
| 2022 | 8.9°C | 7.7°C | 6.4°C | 13.0°C | 1.8°C | 132 mm | 88% | 5.8 m/s | 0.7 |
| 2021 | 10.8°C | 9.6°C | 8.3°C | 13.3°C | 5.4°C | 117 mm | 90% | 6 m/s | 0.6 |
| 2020 🌧️ | 9.4°C | 8.2°C | 7.0°C | 12.8°C | 3.1°C | 223 mm | 89% | 6.3 m/s | 0.7 |
| 2019 | 10.2°C | 8.9°C | 7.6°C | 12.6°C | 3.5°C | 181 mm | 87% | 6.2 m/s | 0.7 |
| 2018 | 11.2°C | 10.1°C | 8.9°C | 13.6°C | 5.5°C | 186 mm | 88% | 6.2 m/s | 0.6 |
| 2017 | 9.9°C | 8.4°C | 6.9°C | 13.0°C | 3.3°C | 138 mm | 88% | 6.2 m/s | 0.7 |
| 2016 | 10.7°C | 9.6°C | 8.5°C | 13.0°C | 5.3°C | 45 mm | 89% | 4.4 m/s | 0.7 |
| 2015 🔥 | 12.7°C | 11.6°C | 10.4°C | 13.8°C | 7.3°C | 134 mm | 88% | 7.8 m/s | 0.5 |
| 2014 | 9.8°C | 8.3°C | 6.9°C | 12.4°C | 2.8°C | 60 mm | 86% | 6.3 m/s | 0.8 |
| 2013 | 10.6°C | 9.0°C | 7.4°C | 12.5°C | 5.4°C | 111 mm | 86% | 6.5 m/s | 0.7 |
| 2012 | 9.7°C | 8.4°C | 7.0°C | 12.7°C | 3.1°C | 187 mm | 88% | 6.6 m/s | 0.7 |
| 2011 | 10.6°C | 9.2°C | 7.8°C | 12.8°C | 4.8°C | 117 mm | 87% | 7.1 m/s | 0.6 |
| 2010 ❄️ | 5.3°C | 4.1°C | 2.9°C | 9.9°C | 0.2°C | 51 mm | 89% | 5.2 m/s | 0.7 |
| 2009 | 8.5°C | 7.0°C | 5.5°C | 12.7°C | 0.8°C | 120 mm | 88% | 5.7 m/s | 0.7 |
| 2008 | 8.3°C | 7.0°C | 5.7°C | 11.9°C | 3.2°C | 69 mm | 88% | 5.4 m/s | 0.8 |
| 2007 | 10.1°C | 8.9°C | 7.6°C | 14.2°C | 4.7°C | 92 mm | 86% | 6.7 m/s | 0.6 |
| 2006 | 10.6°C | 9.4°C | 8.2°C | 13.8°C | 3.3°C | 107 mm | 87% | 6.7 m/s | 0.6 |
| 2005 | 9.0°C | 7.6°C | 6.2°C | 12.0°C | 0.6°C | 101 mm | 87% | 5.4 m/s | 0.7 |
| 2004 | 10.0°C | 8.6°C | 7.1°C | 12.6°C | 3.9°C | 77 mm | 88% | 5 m/s | 0.6 |
| 2003 | 9.4°C | 8.2°C | 7.0°C | 12.5°C | 3.2°C | 108 mm | 87% | 5.9 m/s | 0.6 |
| 2002 | 9.6°C | 8.5°C | 7.4°C | 12.7°C | 2.0°C | 128 mm | 91% | 6.2 m/s | 0.5 |
| 2001 | 8.5°C | 7.0°C | 5.5°C | 13.5°C | 1.7°C | 50 mm | 86% | 5.9 m/s | 0.8 |
| 2000 | 9.6°C | 8.5°C | 7.4°C | 12.8°C | 2.2°C | 158 mm | 89% | 6.9 m/s | 0.6 |
| 1999 | 9.7°C | 8.3°C | 6.8°C | 12.8°C | 1.8°C | 202 mm | 87% | 7.4 m/s | 0.6 |
| 1998 | 10.0°C | 8.5°C | 6.9°C | 13.0°C | 1.7°C | 121 mm | 89% | 6 m/s | 0.5 |
| 1997 | 10.3°C | 9.0°C | 7.6°C | 13.5°C | 3.1°C | 123 mm | 88% | 6.4 m/s | 0.6 |
| 1996 | 7.0°C | 5.7°C | 4.4°C | 12.1°C | -1.6°C | 47 mm | 89% | 5.8 m/s | 0.6 |
| 1995 | 8.3°C | 6.7°C | 5.2°C | 13.3°C | 0.6°C | 123 mm | 90% | 5.7 m/s | 0.6 |
| 1994 | 11.0°C | 9.7°C | 8.4°C | 13.5°C | 3.8°C | 126 mm | 87% | 6.8 m/s | 0.7 |
| 1993 | 9.7°C | 8.1°C | 6.5°C | 12.7°C | 2.1°C | 170 mm | 88% | 7.6 m/s | 0.7 |
| 1992 | 8.6°C | 7.2°C | 5.7°C | 12.8°C | 2.5°C | 96 mm | 88% | 5.8 m/s | 0.6 |
| 1991 | 9.1°C | 8.0°C | 6.9°C | 12.2°C | 3.0°C | 34 mm | 85% | 5.5 m/s | 0.7 |
| 1990 | 8.3°C | 6.8°C | 5.3°C | 11.9°C | 1.6°C | 71 mm | 85% | 6.3 m/s | 0.7 |
| 1989 | 10.0°C | 8.8°C | 7.6°C | 13.2°C | 3.6°C | 155 mm | 88% | 6.7 m/s | 0.7 |
| 1988 | 10.4°C | 9.2°C | 7.9°C | 12.5°C | 3.3°C | 39 mm | 89% | 4.8 m/s | 0.6 |
| 1987 | 9.3°C | 8.3°C | 7.4°C | 12.7°C | 2.5°C | 73 mm | 90% | 6.6 m/s | 0.6 |
| 1986 | 9.9°C | 8.4°C | 6.9°C | 12.9°C | 2.5°C | 123 mm | 87% | 7 m/s | 0.6 |
| 1985 | 10.2°C | 9.0°C | 7.9°C | 14.2°C | 0.6°C | 131 mm | 88% | 5.8 m/s | 0.6 |
| 1984 | 9.9°C | 8.4°C | 7.0°C | 12.4°C | 3.3°C | 120 mm | 88% | 4.8 m/s | 0.7 |
| 1983 | 10.0°C | 8.6°C | 7.2°C | 12.1°C | 3.3°C | 101 mm | 86% | 6.1 m/s | — |
| 1982 | 9.0°C | 7.5°C | 6.0°C | 12.8°C | 2.7°C | 117 mm | 87% | 6 m/s | — |
| 1981 | 7.4°C | 5.7°C | 4.1°C | 11.3°C | 0.2°C | 150 mm | 87% | 5.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 9.6°C with lows near 7°C (mean 8.3°C), based on 45 years of NASA POWER data.
December averages 116 mm of rainfall in Exmouth, a relatively wet time of year. The wettest on record was 223 mm in 2020.
The hottest December reached 14.2°C in 1985. The coldest dipped to -1.6°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.4°C. Daytime highs moved from 9.3°C to 10.4°C and overnight lows from 6.4°C to 8°C over the same span.
December is one of the cooler months of the year in Exmouth and a relatively wet time of year, so plan for around 9.6°C daytime highs and 7°C at night.
Not quite — December is the 4th coolest month in Exmouth, averaging 8.3°C.
For December in Exmouth, pack warm layers and a jacket for chilly mornings, with typical highs of 9.6°C and lows of 7°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 88% — quite humid.
Average wind speed in December is 6.2 m/s. The windiest December on record averaged 7.8 m/s (2015).
The wettest December on record was 2020 with 223 mm. On average, December sees 116 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 Exmouth 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.
