December is one of the warmer months of the year in Coolum Beach, with average highs near 26.7°C and lows around 21.9°C (mean 24.3°C). It is a relatively wet time of year, averaging 145 mm of rainfall and 75% relative humidity across the period.
December is one of the warmer months of the year in Coolum Beach. Across 45 years of records, the warmest December in Coolum Beach was 2023 — when the month averaged 26°C — while the coldest were 1983 and 1999 at 22.3°C. Typical December days reach 26.7°C with nights near 21.9°C. The long-term trend is warming, about 0.2°C per decade.
December is a relatively wet time of year in Coolum Beach, averaging 145 mm of rainfall. The wettest December on record was 2010 with 531 mm, while the driest was 2012 at 37 mm.
Relative humidity in Coolum Beach during December averages 75%. The most humid December was 2010 at 86%, and the least humid was 2019 at 69%.
December receives about 7 kWh/m²/day of solar energy in Coolum Beach. The sunniest December was 2005 at 7.8 kWh/m²/day, and the cloudiest was 2010 at 5.
Average wind speed in Coolum Beach during December is 3.2 m/s. The windiest Decembers were 2010, 2011 and 2022 at 3.7 m/s, while the calmest was 2017 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.0°C | 24.0°C | 24.6°C | 24.4°C | 24.8°C | +0.8°C |
| Avg High | 26.4°C | 26.4°C | 27.1°C | 26.7°C | 27.0°C | +0.6°C |
| Avg Low | 21.6°C | 21.6°C | 22.1°C | 22.0°C | 22.5°C | +0.9°C |
| Avg Rain | 157 mm | 146 mm | 138 mm | 145 mm | 136 mm | -21 mm |
December temperatures in Coolum Beach have risen by about 0.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 17.2°C (1986) to a record high of 34.4°C (2001).
Rainfall in December is a relatively wet time of year, averaging 145 mm, with a wettest year of 531 mm.
A good time to visit Coolum Beach
December is a good time to visit Coolum Beach, with days averaging 26.7°C and nights around 21.9°C (mean 24.3°C, warmer than Coolum Beach's yearly average) and higher rainfall. October and September 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 | 27.5°C | 24.9°C | 22.4°C | 31.1°C | 20.4°C | 92 mm | 72% | 3.1 m/s | — |
| 2024 | 27.1°C | 25.1°C | 23.0°C | 30.7°C | 20.8°C | 182 mm | 79% | 3 m/s | 6.5 |
| 2023 🔥 | 28.4°C | 26.0°C | 23.6°C | 32.0°C | 22.1°C | 163 mm | 77% | 2.9 m/s | 7 |
| 2022 | 25.7°C | 23.4°C | 21.0°C | 30.0°C | 18.5°C | 75 mm | 74% | 3.7 m/s | 6.7 |
| 2021 | 26.2°C | 24.2°C | 22.2°C | 28.6°C | 20.2°C | 142 mm | 78% | 2.9 m/s | 6.8 |
| 2020 | 27.1°C | 24.9°C | 22.8°C | 31.2°C | 21.0°C | 163 mm | 76% | 3.4 m/s | 6.7 |
| 2019 | 28.5°C | 25.6°C | 22.6°C | 33.4°C | 20.6°C | 49 mm | 69% | 3.1 m/s | 7.5 |
| 2018 | 26.6°C | 24.5°C | 22.4°C | 31.3°C | 20.4°C | 113 mm | 75% | 3.5 m/s | 6.7 |
| 2017 | 26.5°C | 24.2°C | 22.0°C | 29.8°C | 18.4°C | 167 mm | 79% | 2.7 m/s | 7.4 |
| 2016 | 27.5°C | 24.9°C | 22.3°C | 30.2°C | 20.2°C | 72 mm | 74% | 3.4 m/s | 7 |
| 2015 | 26.4°C | 24.1°C | 21.9°C | 30.0°C | 20.3°C | 71 mm | 72% | 3.3 m/s | 6.9 |
| 2014 | 27.0°C | 24.7°C | 22.4°C | 30.8°C | 20.1°C | 131 mm | 77% | 3 m/s | 6.7 |
| 2013 | 26.9°C | 24.1°C | 21.4°C | 32.5°C | 19.0°C | 38 mm | 69% | 3.2 m/s | 7.7 |
| 2012 | 27.6°C | 25.1°C | 22.5°C | 31.9°C | 20.8°C | 37 mm | 69% | 3.3 m/s | 7.4 |
| 2011 | 24.6°C | 22.8°C | 20.9°C | 27.2°C | 19.6°C | 242 mm | 77% | 3.7 m/s | 6 |
| 2010 🌧️ | 25.3°C | 23.7°C | 22.0°C | 28.1°C | 18.0°C | 531 mm | 86% | 3.7 m/s | 5 |
| 2009 | 27.5°C | 25.2°C | 22.9°C | 30.0°C | 20.6°C | 102 mm | 74% | 3.2 m/s | 7.2 |
| 2008 | 28.0°C | 25.2°C | 22.4°C | 32.3°C | 20.5°C | 70 mm | 72% | 3.2 m/s | 7.4 |
| 2007 | 26.0°C | 24.1°C | 22.1°C | 28.5°C | 20.8°C | 170 mm | 77% | 3.6 m/s | 5.8 |
| 2006 | 25.1°C | 22.8°C | 20.5°C | 28.9°C | 19.0°C | 101 mm | 73% | 3.6 m/s | 7 |
| 2005 | 28.6°C | 25.9°C | 23.2°C | 31.4°C | 19.7°C | 171 mm | 75% | 3 m/s | 7.8 |
| 2004 | 26.5°C | 24.3°C | 22.0°C | 30.5°C | 20.0°C | 217 mm | 77% | 3.3 m/s | 6.8 |
| 2003 | 26.5°C | 24.2°C | 22.0°C | 31.3°C | 18.2°C | 173 mm | 77% | 3.3 m/s | 6.8 |
| 2002 | 27.1°C | 24.4°C | 21.7°C | 32.8°C | 19.2°C | 148 mm | 70% | 3.2 m/s | 7.7 |
| 2001 | 28.8°C | 25.9°C | 22.9°C | 34.4°C | 20.9°C | 116 mm | 72% | 3.3 m/s | 7.1 |
| 2000 | 26.5°C | 24.1°C | 21.7°C | 30.6°C | 20.0°C | 115 mm | 74% | 3.3 m/s | 7.1 |
| 1999 | 24.3°C | 22.3°C | 20.3°C | 29.0°C | 18.6°C | 185 mm | 76% | 3.4 m/s | 7.1 |
| 1998 | 26.9°C | 24.5°C | 22.1°C | 32.4°C | 19.1°C | 119 mm | 76% | 3 m/s | 7 |
| 1997 | 28.4°C | 25.9°C | 23.4°C | 31.4°C | 21.4°C | 77 mm | 75% | 3.2 m/s | 6.8 |
| 1996 | 26.5°C | 24.1°C | 21.7°C | 31.8°C | 19.3°C | 124 mm | 75% | 3.3 m/s | 6.9 |
| 1995 | 26.5°C | 23.9°C | 21.4°C | 29.7°C | 19.1°C | 185 mm | 73% | 3.3 m/s | 7.2 |
| 1994 | 26.0°C | 23.6°C | 21.3°C | 30.5°C | 20.0°C | 120 mm | 72% | 3.4 m/s | 7.7 |
| 1993 | 25.9°C | 23.3°C | 20.7°C | 29.3°C | 19.3°C | 154 mm | 73% | 3.1 m/s | 7.2 |
| 1992 | 26.2°C | 23.8°C | 21.4°C | 30.2°C | 18.5°C | 79 mm | 74% | 3.5 m/s | 6.9 |
| 1991 | 25.7°C | 23.6°C | 21.4°C | 28.3°C | 19.5°C | 317 mm | 79% | 3.1 m/s | 7 |
| 1990 | 27.9°C | 25.3°C | 22.7°C | 33.0°C | 20.0°C | 102 mm | 76% | 3 m/s | 7.1 |
| 1989 | 26.0°C | 23.5°C | 21.0°C | 30.1°C | 18.8°C | 86 mm | 73% | 3.5 m/s | 7.3 |
| 1988 | 26.0°C | 24.1°C | 22.2°C | 29.5°C | 20.7°C | 285 mm | 81% | 3.6 m/s | 6.4 |
| 1987 | 26.4°C | 24.0°C | 21.5°C | 29.6°C | 17.5°C | 145 mm | 75% | 3.1 m/s | 7.3 |
| 1986 | 25.9°C | 23.5°C | 21.2°C | 30.7°C | 17.2°C | 126 mm | 76% | 3.2 m/s | 6.9 |
| 1985 | 27.7°C | 24.9°C | 22.1°C | 32.5°C | 19.0°C | 127 mm | 75% | 3 m/s | 7.1 |
| 1984 | 27.2°C | 24.5°C | 21.8°C | 30.9°C | 18.8°C | 143 mm | 76% | 3.1 m/s | 6.8 |
| 1983 ❄️ | 24.4°C | 22.3°C | 20.3°C | 28.5°C | 17.9°C | 184 mm | 76% | 3.1 m/s | — |
| 1982 | 26.8°C | 24.1°C | 21.5°C | 28.9°C | 19.6°C | 102 mm | 74% | 3.1 m/s | — |
| 1981 | 27.0°C | 24.9°C | 22.9°C | 30.2°C | 21.0°C | 216 mm | 81% | 2.8 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 26.7°C with lows near 21.9°C (mean 24.3°C), based on 45 years of NASA POWER data.
December averages 145 mm of rainfall in Coolum Beach, a relatively wet time of year. The wettest on record was 531 mm in 2010.
The hottest December reached 34.4°C in 2001. The coldest dipped to 17.2°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.6°C. Daytime highs moved from 26.6°C to 27°C and overnight lows from 21.7°C to 22.4°C over the same span.
December is one of the warmer months of the year in Coolum Beach and a relatively wet time of year, so plan for around 26.7°C daytime highs and 21.9°C at night.
Not quite — December is the 10th coolest month in Coolum Beach, averaging 24.3°C.
For December in Coolum Beach, pack light layers you can adjust through the day, with typical highs of 26.7°C and lows of 21.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 75% — quite humid.
Average wind speed in December is 3.2 m/s. The windiest December on record averaged 3.7 m/s (2010).
The wettest December on record was 2010 with 531 mm. On average, December sees 145 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 Coolum Beach 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.
