December is one of the warmer months of the year in Manukau City, with average highs near 21.4°C and lows around 15.4°C (mean 18.4°C). It is about average for rainfall, averaging 84 mm of rainfall and 75% relative humidity across the period.
December is one of the warmer months of the year in Manukau City. Across 45 years of records, the warmest December in Manukau City was 2021 — when the month averaged 20.5°C — while the coldest was 2004 at 15.7°C. Typical December days reach 21.4°C with nights near 15.4°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Manukau City, averaging 84 mm of rainfall. The wettest December on record was 1996 with 185 mm, while the driest was 1993 at 6 mm.
Relative humidity in Manukau City during December averages 75%. The most humid December was 2001 at 80%, and the least humid was 1993 at 69%.
December receives about 6.3 kWh/m²/day of solar energy in Manukau City. The sunniest December was 2017 at 7.4 kWh/m²/day, and the cloudiest was 2011 at 5.4.
Average wind speed in Manukau City during December is 4.7 m/s. The windiest December was 2004 at 6.5 m/s, while the calmest was 2022 at 3.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.3°C | 17.9°C | 18.0°C | 18.7°C | 19.4°C | +1.1°C |
| Avg High | 21.3°C | 21.0°C | 20.9°C | 21.7°C | 22.3°C | +1°C |
| Avg Low | 15.2°C | 14.8°C | 15.1°C | 15.8°C | 16.4°C | +1.2°C |
| Avg Rain | 112 mm | 62 mm | 82 mm | 80 mm | 92 mm | -20 mm |
December temperatures in Manukau City have risen by about 1.2°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 8.3°C (2006) to a record high of 26.7°C (2025).
Rainfall in December is about average for rainfall, averaging 84 mm, with a wettest year of 185 mm.
One of the best times to visit Manukau City
December is one of the best times to visit Manukau City. Expect days averaging 21.4°C and nights around 15.4°C (mean 18.4°C) — warmer than Manukau City's yearly average — with higher rainfall (84 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 | 22.7°C | 19.5°C | 16.4°C | 26.7°C | 14.6°C | 76 mm | 75% | 4.9 m/s | — |
| 2024 | 22.6°C | 19.4°C | 16.2°C | 25.8°C | 12.2°C | 85 mm | 77% | 4.5 m/s | 7.2 |
| 2023 | 22.0°C | 19.2°C | 16.5°C | 25.2°C | 12.9°C | 121 mm | 80% | 4.4 m/s | 5.6 |
| 2022 | 22.2°C | 19.4°C | 16.6°C | 25.2°C | 13.0°C | 136 mm | 79% | 3.7 m/s | 6.6 |
| 2021 🔥 | 23.2°C | 20.5°C | 17.8°C | 26.0°C | 15.2°C | 95 mm | 78% | 4.6 m/s | 6.4 |
| 2020 | 21.4°C | 18.2°C | 15.0°C | 24.7°C | 11.4°C | 37 mm | 74% | 4.8 m/s | 7.2 |
| 2019 | 22.4°C | 19.0°C | 15.5°C | 24.9°C | 11.9°C | 57 mm | 74% | 4.7 m/s | 6.8 |
| 2018 | 22.0°C | 19.2°C | 16.4°C | 25.1°C | 11.8°C | 171 mm | 78% | 4.2 m/s | 6.5 |
| 2017 | 23.3°C | 20.1°C | 16.9°C | 25.3°C | 13.2°C | 21 mm | 72% | 4 m/s | 7.4 |
| 2016 | 20.8°C | 17.7°C | 14.6°C | 23.5°C | 12.4°C | 39 mm | 75% | 4.6 m/s | 6.8 |
| 2015 | 20.8°C | 17.8°C | 14.9°C | 25.4°C | 12.4°C | 28 mm | 75% | 4.9 m/s | 6.9 |
| 2014 | 20.9°C | 18.0°C | 15.1°C | 24.0°C | 9.8°C | 75 mm | 77% | 4.6 m/s | 5.9 |
| 2013 | 21.7°C | 18.7°C | 15.7°C | 25.6°C | 12.8°C | 106 mm | 73% | 4.5 m/s | 6.7 |
| 2012 | 22.0°C | 18.9°C | 15.9°C | 25.1°C | 11.3°C | 60 mm | 78% | 4.5 m/s | 5.9 |
| 2011 | 20.6°C | 18.1°C | 15.6°C | 23.2°C | 12.4°C | 177 mm | 78% | 4.8 m/s | 5.4 |
| 2010 | 22.8°C | 19.8°C | 16.9°C | 26.3°C | 14.0°C | 72 mm | 77% | 4.2 m/s | 5.6 |
| 2009 | 21.1°C | 17.9°C | 14.7°C | 23.9°C | 11.5°C | 70 mm | 75% | 4.7 m/s | 6.8 |
| 2008 | 21.3°C | 18.3°C | 15.3°C | 24.3°C | 12.4°C | 91 mm | 75% | 4.7 m/s | 6.1 |
| 2007 | 21.7°C | 18.6°C | 15.6°C | 24.2°C | 13.7°C | 58 mm | 76% | 4.6 m/s | 5.6 |
| 2006 | 18.7°C | 15.8°C | 12.9°C | 20.9°C | 8.3°C | 51 mm | 74% | 5.1 m/s | 6.5 |
| 2005 | 21.8°C | 18.9°C | 16.1°C | 24.2°C | 13.2°C | 85 mm | 79% | 5.1 m/s | 6.4 |
| 2004 ❄️ | 18.3°C | 15.7°C | 13.1°C | 22.3°C | 9.8°C | 120 mm | 75% | 6.5 m/s | 6 |
| 2003 | 21.7°C | 18.7°C | 15.8°C | 25.2°C | 11.8°C | 80 mm | 77% | 4.1 m/s | 6.3 |
| 2002 | 20.6°C | 17.7°C | 14.8°C | 23.3°C | 12.4°C | 79 mm | 75% | 4.8 m/s | 6.2 |
| 2001 | 21.6°C | 19.1°C | 16.7°C | 24.2°C | 14.2°C | 140 mm | 80% | 5.3 m/s | 5.6 |
| 2000 | 21.8°C | 18.9°C | 16.0°C | 24.5°C | 13.2°C | 43 mm | 75% | 4.5 m/s | 6.4 |
| 1999 | 20.3°C | 17.4°C | 14.5°C | 22.2°C | 12.1°C | 26 mm | 73% | 4.8 m/s | 6.2 |
| 1998 | 21.7°C | 18.6°C | 15.6°C | 26.5°C | 13.1°C | 47 mm | 74% | 4.7 m/s | 6.3 |
| 1997 | 21.7°C | 18.3°C | 14.9°C | 25.6°C | 12.2°C | 41 mm | 73% | 4.1 m/s | 6.4 |
| 1996 🌧️ | 20.2°C | 17.2°C | 14.2°C | 22.4°C | 11.0°C | 185 mm | 76% | 5 m/s | 6.1 |
| 1995 | 21.6°C | 18.7°C | 15.9°C | 26.5°C | 13.7°C | 91 mm | 79% | 4.9 m/s | 6.2 |
| 1994 | 22.0°C | 18.6°C | 15.2°C | 25.6°C | 12.2°C | 18 mm | 72% | 4.5 m/s | 6.3 |
| 1993 | 20.8°C | 17.6°C | 14.4°C | 25.7°C | 10.9°C | 6 mm | 69% | 4.7 m/s | 6 |
| 1992 | 20.2°C | 17.3°C | 14.5°C | 22.1°C | 8.7°C | 139 mm | 78% | 5 m/s | 5.6 |
| 1991 | 20.1°C | 17.0°C | 14.0°C | 23.5°C | 9.9°C | 38 mm | 75% | 4.4 m/s | 6.2 |
| 1990 | 21.4°C | 18.2°C | 15.1°C | 24.3°C | 13.2°C | 26 mm | 74% | 5.3 m/s | 6.4 |
| 1989 | 21.0°C | 17.8°C | 14.6°C | 23.7°C | 11.7°C | 71 mm | 73% | 4.9 m/s | 6.5 |
| 1988 | 22.1°C | 19.1°C | 16.0°C | 24.5°C | 13.8°C | 176 mm | 74% | 4.5 m/s | 6.6 |
| 1987 | 20.7°C | 17.9°C | 15.1°C | 25.0°C | 12.3°C | 140 mm | 77% | 5 m/s | 6.3 |
| 1986 | 21.1°C | 17.8°C | 14.6°C | 23.8°C | 10.6°C | 122 mm | 72% | 3.9 m/s | 6.9 |
| 1985 | 21.7°C | 18.6°C | 15.5°C | 24.7°C | 13.1°C | 133 mm | 75% | 3.9 m/s | 6.8 |
| 1984 | 22.6°C | 19.4°C | 16.3°C | 25.5°C | 14.1°C | 129 mm | 78% | 4.1 m/s | 6.3 |
| 1983 | 19.9°C | 17.1°C | 14.2°C | 22.1°C | 10.9°C | 136 mm | 75% | 5.3 m/s | — |
| 1982 | 20.5°C | 17.3°C | 14.0°C | 23.8°C | 9.1°C | 40 mm | 73% | 5.1 m/s | — |
| 1981 | 22.5°C | 19.4°C | 16.2°C | 26.6°C | 13.6°C | 61 mm | 77% | 3.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 21.4°C with lows near 15.4°C (mean 18.4°C), based on 45 years of NASA POWER data.
December averages 84 mm of rainfall in Manukau City, about average for rainfall. The wettest on record was 185 mm in 1996.
The hottest December reached 26.7°C in 2025. The coldest dipped to 8.3°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.2°C. Daytime highs moved from 21.4°C to 22.5°C and overnight lows from 15.2°C to 16.7°C over the same span.
December is one of the warmer months of the year in Manukau City and about average for rainfall, so plan for around 21.4°C daytime highs and 15.4°C at night.
Not quite — December is the 9th coolest month in Manukau City, averaging 18.4°C.
For December in Manukau City, pack light layers you can adjust through the day, with typical highs of 21.4°C and lows of 15.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 75% — quite humid.
Average wind speed in December is 4.7 m/s. The windiest December on record averaged 6.5 m/s (2004).
The wettest December on record was 1996 with 185 mm. On average, December sees 84 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 Manukau City 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.
