December is one of the warmer months of the year in Kiama, with average highs near 25.7°C and lows around 14.4°C (mean 20.1°C). It is about average for rainfall, averaging 76 mm of rainfall and 67% relative humidity across the period.
December is one of the warmer months of the year in Kiama. Across 45 years of records, the warmest December in Kiama was 1990 — when the month averaged 22.8°C — while the coldest was 2011 at 16.8°C. Typical December days reach 25.7°C with nights near 14.4°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Kiama, averaging 76 mm of rainfall. The wettest December on record was 1991 with 214 mm, while the driest was 2019 at 3 mm.
Relative humidity in Kiama during December averages 67%. The most humid December was 1992 at 81%, and the least humid was 2019 at 54%.
December receives about 6.6 kWh/m²/day of solar energy in Kiama. The sunniest December was 2005 at 8.3 kWh/m²/day, and the cloudiest was 1992 at 5.6.
Average wind speed in Kiama during December is 0.5 m/s. The windiest Decembers were 2022, 2023 and 2025, among others at 0.5 m/s, while the calmest were 2017, 2018 and 2024, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.4°C | 19.7°C | 20.4°C | 20.6°C | 20.2°C | +0.8°C |
| Avg High | 25.0°C | 25.4°C | 26.2°C | 26.3°C | 25.7°C | +0.7°C |
| Avg Low | 13.9°C | 14.1°C | 14.6°C | 14.9°C | 14.6°C | +0.7°C |
| Avg Rain | 86 mm | 82 mm | 63 mm | 75 mm | 72 mm | -14 mm |
December temperatures in Kiama have risen by about 0.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 6.5°C (1995) to a record high of 41.1°C (2019).
Rainfall in December is about average for rainfall, averaging 76 mm, with a wettest year of 214 mm.
One of the best times to visit Kiama
December is one of the best times to visit Kiama. Expect days averaging 25.7°C and nights around 14.4°C (mean 20.1°C) — warmer than Kiama's yearly average — with moderate rainfall (76 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 | 28.0°C | 21.4°C | 14.8°C | 38.8°C | 9.1°C | 41 mm | 58% | 0.5 m/s | — |
| 2024 | 28.8°C | 22.4°C | 15.9°C | 37.4°C | 11.2°C | 31 mm | 64% | 0.4 m/s | 7.6 |
| 2023 | 26.1°C | 21.1°C | 16.0°C | 36.9°C | 12.9°C | 135 mm | 76% | 0.5 m/s | 6 |
| 2022 | 22.6°C | 17.6°C | 12.6°C | 31.6°C | 7.9°C | 42 mm | 70% | 0.5 m/s | 6.8 |
| 2021 | 24.1°C | 19.0°C | 14.0°C | 31.1°C | 10.7°C | 88 mm | 76% | 0.5 m/s | 6 |
| 2020 | 24.6°C | 19.5°C | 14.4°C | 36.1°C | 11.2°C | 94 mm | 71% | 0.5 m/s | 5.7 |
| 2019 | 28.9°C | 21.9°C | 15.0°C | 41.1°C | 11.5°C | 3 mm | 54% | 0.5 m/s | 7.1 |
| 2018 | 27.5°C | 21.5°C | 15.6°C | 37.5°C | 10.3°C | 106 mm | 70% | 0.4 m/s | 6.6 |
| 2017 | 28.3°C | 22.3°C | 16.3°C | 38.9°C | 12.8°C | 53 mm | 67% | 0.4 m/s | 6.1 |
| 2016 | 28.4°C | 22.4°C | 16.4°C | 35.4°C | 11.5°C | 69 mm | 64% | 0.4 m/s | 6.3 |
| 2015 | 26.9°C | 20.8°C | 14.8°C | 36.7°C | 10.5°C | 61 mm | 63% | 0.5 m/s | 6.9 |
| 2014 | 25.2°C | 20.1°C | 15.0°C | 31.4°C | 9.7°C | 167 mm | 73% | 0.4 m/s | 6.3 |
| 2013 | 27.1°C | 20.6°C | 14.2°C | 37.9°C | 8.4°C | 54 mm | 62% | 0.5 m/s | 7.2 |
| 2012 | 26.5°C | 20.5°C | 14.4°C | 35.4°C | 10.7°C | 34 mm | 64% | 0.5 m/s | 6.2 |
| 2011 ❄️ | 21.0°C | 16.8°C | 12.6°C | 26.9°C | 7.7°C | 72 mm | 76% | 0.5 m/s | 5.7 |
| 2010 | 23.5°C | 18.9°C | 14.3°C | 31.8°C | 8.6°C | 130 mm | 77% | 0.5 m/s | 6.2 |
| 2009 | 27.3°C | 21.2°C | 15.0°C | 38.1°C | 11.0°C | 82 mm | 65% | 0.5 m/s | 6.7 |
| 2008 | 25.4°C | 19.7°C | 14.0°C | 32.6°C | 10.0°C | 89 mm | 64% | 0.5 m/s | 6.6 |
| 2007 | 23.7°C | 19.2°C | 14.7°C | 30.1°C | 11.9°C | 100 mm | 76% | 0.5 m/s | 5.7 |
| 2006 | 25.4°C | 19.6°C | 13.8°C | 37.2°C | 8.6°C | 74 mm | 66% | 0.5 m/s | 6.1 |
| 2005 | 28.4°C | 21.6°C | 14.8°C | 36.0°C | 10.2°C | 30 mm | 58% | 0.4 m/s | 8.3 |
| 2004 | 24.9°C | 19.5°C | 14.1°C | 35.6°C | 8.9°C | 90 mm | 70% | 0.5 m/s | 6.5 |
| 2003 | 26.2°C | 20.8°C | 15.4°C | 36.3°C | 12.3°C | 44 mm | 69% | 0.5 m/s | 6.2 |
| 2002 | 26.2°C | 20.3°C | 14.4°C | 37.6°C | 8.4°C | 52 mm | 65% | 0.5 m/s | 6.8 |
| 2001 | 26.6°C | 20.6°C | 14.5°C | 35.1°C | 10.9°C | 28 mm | 60% | 0.5 m/s | 6.6 |
| 2000 | 27.4°C | 21.3°C | 15.3°C | 36.2°C | 9.3°C | 41 mm | 64% | 0.5 m/s | 7.3 |
| 1999 | 23.5°C | 18.6°C | 13.7°C | 31.9°C | 9.2°C | 114 mm | 73% | 0.5 m/s | 6.2 |
| 1998 | 26.7°C | 21.0°C | 15.3°C | 34.9°C | 10.4°C | 35 mm | 69% | 0.5 m/s | 6.6 |
| 1997 | 28.7°C | 22.3°C | 15.9°C | 37.0°C | 13.4°C | 29 mm | 60% | 0.5 m/s | 6.7 |
| 1996 | 25.6°C | 19.3°C | 13.0°C | 33.8°C | 9.9°C | 50 mm | 65% | 0.4 m/s | 6.6 |
| 1995 | 23.0°C | 17.6°C | 12.2°C | 29.1°C | 6.5°C | 74 mm | 71% | 0.5 m/s | 6.6 |
| 1994 | 26.6°C | 20.4°C | 14.2°C | 39.5°C | 9.3°C | 49 mm | 67% | 0.5 m/s | 6.9 |
| 1993 | 25.4°C | 19.8°C | 14.1°C | 36.5°C | 10.1°C | 39 mm | 65% | 0.5 m/s | 6.4 |
| 1992 | 21.9°C | 17.9°C | 14.0°C | 27.6°C | 10.1°C | 175 mm | 81% | 0.5 m/s | 5.6 |
| 1991 🌧️ | 22.7°C | 17.7°C | 12.7°C | 31.5°C | 7.8°C | 214 mm | 74% | 0.5 m/s | 6.2 |
| 1990 🔥 | 30.0°C | 22.8°C | 15.6°C | 37.6°C | 9.3°C | 38 mm | 60% | 0.4 m/s | 7.4 |
| 1989 | 25.0°C | 19.4°C | 13.8°C | 32.4°C | 9.3°C | 101 mm | 68% | 0.5 m/s | 6.8 |
| 1988 | 24.1°C | 19.6°C | 15.1°C | 31.3°C | 10.3°C | 124 mm | 77% | 0.5 m/s | 5.8 |
| 1987 | 24.9°C | 19.3°C | 13.7°C | 35.8°C | 7.3°C | 92 mm | 67% | 0.5 m/s | 6.6 |
| 1986 | 23.8°C | 18.3°C | 12.8°C | 32.3°C | 7.3°C | 39 mm | 66% | 0.5 m/s | 7.1 |
| 1985 | 24.2°C | 19.3°C | 14.4°C | 31.4°C | 10.5°C | 105 mm | 70% | 0.5 m/s | 6.5 |
| 1984 | 24.8°C | 19.1°C | 13.4°C | 35.6°C | 9.0°C | 78 mm | 57% | 0.5 m/s | 7.1 |
| 1983 | 23.9°C | 18.7°C | 13.5°C | 35.5°C | 8.6°C | 93 mm | 72% | 0.5 m/s | — |
| 1982 | 27.5°C | 21.0°C | 14.5°C | 36.9°C | 10.6°C | 28 mm | 60% | 0.5 m/s | — |
| 1981 | 26.4°C | 20.3°C | 14.3°C | 35.7°C | 10.0°C | 113 mm | 65% | 0.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.7°C with lows near 14.4°C (mean 20.1°C), based on 45 years of NASA POWER data.
December averages 76 mm of rainfall in Kiama, about average for rainfall. The wettest on record was 214 mm in 1991.
The hottest December reached 41.1°C in 2019. The coldest dipped to 6.5°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.6°C. Daytime highs moved from 25.4°C to 25.9°C and overnight lows from 14°C to 14.7°C over the same span.
December is one of the warmer months of the year in Kiama and about average for rainfall, so plan for around 25.7°C daytime highs and 14.4°C at night.
Not quite — December is the 10th coolest month in Kiama, averaging 20.1°C.
For December in Kiama, pack light layers you can adjust through the day, with typical highs of 25.7°C and lows of 14.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 67% — moderately humid.
Average wind speed in December is 0.5 m/s. The windiest December on record averaged 0.5 m/s (1981).
The wettest December on record was 1991 with 214 mm. On average, December sees 76 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 Kiama 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.
