December is one of the warmer months of the year in Byron Bay, with average highs near 25°C and lows around 22.5°C (mean 23.8°C). It is a relatively wet time of year, averaging 134 mm of rainfall and 77% relative humidity across the period.
December is one of the warmer months of the year in Byron Bay. Across 45 years of records, the warmest December in Byron Bay was 2005 — when the month averaged 25.5°C — while the coldest was 1999 at 22°C. Typical December days reach 25°C with nights near 22.5°C. The long-term trend is warming, about 0.2°C per decade.
December is a relatively wet time of year in Byron Bay, averaging 134 mm of rainfall. The wettest December on record was 2010 with 380 mm, while the driest was 2013 at 30 mm.
Relative humidity in Byron Bay during December averages 77%. The most humid December was 1988 at 81%, and the least humid was 2002 at 72%.
December receives about 6.6 kWh/m²/day of solar energy in Byron Bay. The sunniest December was 2005 at 7.7 kWh/m²/day, and the cloudiest was 2010 at 4.9.
Average wind speed in Byron Bay during December is 5.6 m/s. The windiest December was 1988 at 6.3 m/s, while the calmest was 2023 at 4.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.4°C | 23.5°C | 24.0°C | 23.8°C | 24.2°C | +0.8°C |
| Avg High | 24.8°C | 24.8°C | 25.3°C | 25.0°C | 25.3°C | +0.5°C |
| Avg Low | 22.1°C | 22.2°C | 22.8°C | 22.6°C | 23.0°C | +0.9°C |
| Avg Rain | 137 mm | 139 mm | 122 mm | 121 mm | 158 mm | +21 mm |
December temperatures in Byron Bay have risen by about 0.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 17.1°C (1986) to a record high of 31.1°C (1981).
Rainfall in December is a relatively wet time of year, averaging 134 mm, with a wettest year of 380 mm.
A good time to visit Byron Bay
December is a good time to visit Byron Bay, with days averaging 25°C and nights around 22.5°C (mean 23.8°C, warmer than Byron Bay's yearly average) and higher rainfall. November and October are marginally more temperate, but December still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 25.5°C | 24.2°C | 22.9°C | 28.6°C | 21.2°C | 123 mm | 75% | 5.8 m/s | — |
| 2024 | 25.9°C | 24.8°C | 23.6°C | 28.7°C | 21.7°C | 121 mm | 81% | 5.1 m/s | 6.8 |
| 2023 | 26.5°C | 25.2°C | 24.0°C | 30.8°C | 22.3°C | 136 mm | 80% | 4.6 m/s | 7.2 |
| 2022 | 23.7°C | 22.5°C | 21.3°C | 28.1°C | 18.8°C | 84 mm | 76% | 6.1 m/s | 6.4 |
| 2021 | 25.0°C | 24.0°C | 22.9°C | 27.8°C | 21.9°C | 143 mm | 78% | 5 m/s | 6.4 |
| 2020 | 25.5°C | 24.4°C | 23.3°C | 28.1°C | 21.2°C | 340 mm | 80% | 6.1 m/s | 5.8 |
| 2019 | 25.7°C | 24.3°C | 22.9°C | 28.6°C | 21.8°C | 75 mm | 74% | 5.2 m/s | 7.3 |
| 2018 | 25.1°C | 23.9°C | 22.7°C | 28.7°C | 21.1°C | 50 mm | 77% | 5.8 m/s | 6.9 |
| 2017 | 25.6°C | 24.3°C | 22.9°C | 28.1°C | 20.8°C | 90 mm | 79% | 5.2 m/s | 7 |
| 2016 | 25.4°C | 24.1°C | 22.8°C | 28.4°C | 21.3°C | 38 mm | 77% | 6.1 m/s | 6.8 |
| 2015 | 24.9°C | 23.7°C | 22.5°C | 27.7°C | 21.0°C | 105 mm | 74% | 5.8 m/s | 6.3 |
| 2014 | 25.5°C | 24.3°C | 23.1°C | 29.7°C | 21.0°C | 195 mm | 79% | 5.5 m/s | 6.1 |
| 2013 | 24.5°C | 23.1°C | 21.7°C | 28.7°C | 18.3°C | 30 mm | 74% | 5.2 m/s | 7.1 |
| 2012 | 25.5°C | 24.4°C | 23.2°C | 30.0°C | 21.6°C | 77 mm | 75% | 5.4 m/s | 6.6 |
| 2011 | 23.5°C | 22.4°C | 21.4°C | 27.0°C | 19.5°C | 171 mm | 76% | 6.1 m/s | 5.5 |
| 2010 🌧️ | 24.8°C | 23.7°C | 22.6°C | 27.5°C | 19.0°C | 380 mm | 81% | 5.7 m/s | 4.9 |
| 2009 | 25.6°C | 24.6°C | 23.5°C | 27.2°C | 20.4°C | 135 mm | 77% | 5.8 m/s | 6.5 |
| 2008 | 25.7°C | 24.2°C | 22.7°C | 29.6°C | 20.9°C | 96 mm | 76% | 5.8 m/s | 6.7 |
| 2007 | 24.8°C | 23.8°C | 22.9°C | 26.4°C | 21.9°C | 129 mm | 77% | 5.7 m/s | 5.6 |
| 2006 | 23.5°C | 22.4°C | 21.3°C | 26.4°C | 20.1°C | 83 mm | 73% | 5.6 m/s | 6.3 |
| 2005 🔥 | 27.0°C | 25.5°C | 24.0°C | 29.3°C | 22.1°C | 167 mm | 76% | 5.6 m/s | 7.7 |
| 2004 | 24.7°C | 23.5°C | 22.3°C | 28.8°C | 20.1°C | 187 mm | 79% | 6.2 m/s | 6 |
| 2003 | 25.2°C | 24.0°C | 22.7°C | 28.1°C | 19.9°C | 117 mm | 77% | 6 m/s | 6.2 |
| 2002 | 25.3°C | 23.9°C | 22.5°C | 29.1°C | 20.0°C | 140 mm | 72% | 5.7 m/s | 7.2 |
| 2001 | 26.2°C | 24.7°C | 23.2°C | 30.8°C | 21.3°C | 68 mm | 76% | 6 m/s | 6.6 |
| 2000 | 24.9°C | 23.7°C | 22.6°C | 27.9°C | 21.0°C | 100 mm | 77% | 5.5 m/s | 6.6 |
| 1999 ❄️ | 23.2°C | 22.0°C | 20.8°C | 26.4°C | 19.9°C | 147 mm | 76% | 5.3 m/s | 6.7 |
| 1998 | 25.1°C | 23.8°C | 22.6°C | 29.7°C | 19.8°C | 100 mm | 79% | 5.1 m/s | 6.6 |
| 1997 | 26.2°C | 25.0°C | 23.8°C | 28.3°C | 21.6°C | 76 mm | 80% | 5.8 m/s | 6.8 |
| 1996 | 24.4°C | 23.2°C | 21.9°C | 27.9°C | 19.9°C | 138 mm | 78% | 5.2 m/s | 6.5 |
| 1995 | 24.9°C | 23.4°C | 21.8°C | 29.1°C | 19.1°C | 179 mm | 74% | 5.9 m/s | 7.1 |
| 1994 | 24.3°C | 23.1°C | 22.0°C | 29.4°C | 19.2°C | 136 mm | 76% | 5.9 m/s | 7 |
| 1993 | 24.5°C | 23.0°C | 21.6°C | 28.0°C | 19.6°C | 131 mm | 74% | 5.7 m/s | 6.9 |
| 1992 | 24.2°C | 22.9°C | 21.7°C | 27.2°C | 17.3°C | 122 mm | 77% | 6.1 m/s | 6.7 |
| 1991 | 24.5°C | 23.2°C | 21.9°C | 27.6°C | 20.0°C | 291 mm | 78% | 5.6 m/s | 6.8 |
| 1990 | 26.3°C | 24.9°C | 23.5°C | 30.3°C | 21.3°C | 75 mm | 78% | 5.9 m/s | 6.9 |
| 1989 | 24.0°C | 22.7°C | 21.4°C | 28.3°C | 20.0°C | 112 mm | 77% | 5.8 m/s | 6.6 |
| 1988 | 24.6°C | 23.6°C | 22.6°C | 27.0°C | 21.0°C | 259 mm | 81% | 6.3 m/s | 6 |
| 1987 | 25.0°C | 23.7°C | 22.4°C | 29.0°C | 19.9°C | 117 mm | 76% | 5.5 m/s | 6.7 |
| 1986 | 24.6°C | 23.2°C | 21.7°C | 28.2°C | 17.1°C | 72 mm | 75% | 5.4 m/s | 6.9 |
| 1985 | 25.4°C | 23.8°C | 22.3°C | 28.7°C | 18.6°C | 78 mm | 78% | 5.5 m/s | 6.9 |
| 1984 | 24.7°C | 23.3°C | 21.9°C | 29.1°C | 18.9°C | 122 mm | 78% | 5.5 m/s | 6.5 |
| 1983 | 23.6°C | 22.4°C | 21.1°C | 28.0°C | 18.5°C | 200 mm | 75% | 5.4 m/s | — |
| 1982 | 25.0°C | 23.6°C | 22.2°C | 27.5°C | 20.6°C | 160 mm | 76% | 5.4 m/s | — |
| 1981 | 26.1°C | 24.7°C | 23.3°C | 31.1°C | 21.7°C | 115 mm | 79% | 5.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25°C with lows near 22.5°C (mean 23.8°C), based on 45 years of NASA POWER data.
December averages 134 mm of rainfall in Byron Bay, a relatively wet time of year. The wettest on record was 380 mm in 2010.
The hottest December reached 31.1°C in 1981. The coldest dipped to 17.1°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.5°C. Daytime highs moved from 25°C to 25.3°C and overnight lows from 22.2°C to 22.9°C over the same span.
December is one of the warmer months of the year in Byron Bay and a relatively wet time of year, so plan for around 25°C daytime highs and 22.5°C at night.
Not quite — December is the 9th coolest month in Byron Bay, averaging 23.8°C.
For December in Byron Bay, pack light layers you can adjust through the day, with typical highs of 25°C and lows of 22.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 77% — quite humid.
Average wind speed in December is 5.6 m/s. The windiest December on record averaged 6.3 m/s (1988).
The wettest December on record was 2010 with 380 mm. On average, December sees 134 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 Byron Bay 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.
