January is one of the warmer months of the year in Waiuku, with average highs near 23.1°C and lows around 16.7°C (mean 19.9°C). It is one of the drier months, averaging 69 mm of rainfall and 74% relative humidity across the period.
January is one of the warmer months of the year in Waiuku. Across 45 years of records, the warmest January in Waiuku was 2018 — when the month averaged 22°C — while the coldest were 1983 and 1997 at 18.2°C. Typical January days reach 23.1°C with nights near 16.7°C. The long-term trend is warming, about 0.2°C per decade.
January is one of the drier months in Waiuku, averaging 69 mm of rainfall. The wettest January on record was 2023 with 371 mm, while the driest was 1994 at 3 mm.
Relative humidity in Waiuku during January averages 74%. The most humid January was 1989 at 80%, and the least humid was 1994 at 69%.
January receives about 6.8 kWh/m²/day of solar energy in Waiuku. The sunniest January was 2022 at 7.7 kWh/m²/day, and the cloudiest was 2023 at 5.9.
Average wind speed in Waiuku during January is 4.5 m/s. The windiest January was 1983 at 5.6 m/s, while the calmest was 2015 at 3.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.8°C | 19.7°C | 19.7°C | 20.1°C | 20.3°C | +0.5°C |
| Avg High | 23.0°C | 22.9°C | 22.9°C | 23.3°C | 23.4°C | +0.4°C |
| Avg Low | 16.6°C | 16.5°C | 16.6°C | 16.9°C | 17.2°C | +0.6°C |
| Avg Rain | 81 mm | 52 mm | 59 mm | 65 mm | 102 mm | +21 mm |
January temperatures in Waiuku have risen by about 0.7°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 10.3°C (1997) to a record high of 28.1°C (1999).
Rainfall in January is one of the drier months, averaging 69 mm, with a wettest year of 371 mm.
One of the best times to visit Waiuku
January is one of the best times to visit Waiuku. Expect days averaging 23.1°C and nights around 16.7°C (mean 19.9°C) — warmer than Waiuku's yearly average — with moderate rainfall (69 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 | 22.4°C | 19.3°C | 16.1°C | 25.5°C | 12.6°C | 78 mm | 74% | 5.1 m/s | 7.4 |
| 2024 | 24.7°C | 21.5°C | 18.2°C | 27.4°C | 14.4°C | 64 mm | 75% | 3.8 m/s | 7.2 |
| 2023 🌧️ | 22.4°C | 20.1°C | 17.7°C | 26.5°C | 16.0°C | 371 mm | 80% | 5.2 m/s | 5.9 |
| 2022 | 24.5°C | 21.1°C | 17.8°C | 27.7°C | 16.0°C | 31 mm | 72% | 3.9 m/s | 7.7 |
| 2021 | 23.4°C | 20.2°C | 17.0°C | 26.6°C | 14.5°C | 53 mm | 72% | 4.2 m/s | 7.3 |
| 2020 | 23.1°C | 19.7°C | 16.4°C | 26.8°C | 13.7°C | 15 mm | 73% | 4.4 m/s | 7.2 |
| 2019 | 24.0°C | 20.8°C | 17.6°C | 28.0°C | 15.5°C | 27 mm | 76% | 4.6 m/s | 7.1 |
| 2018 🔥 | 24.8°C | 22.0°C | 19.2°C | 27.7°C | 16.8°C | 147 mm | 78% | 4.5 m/s | 6.5 |
| 2017 | 21.7°C | 18.7°C | 15.7°C | 24.8°C | 12.9°C | 48 mm | 74% | 5.4 m/s | 6.6 |
| 2016 | 24.0°C | 20.8°C | 17.7°C | 27.4°C | 13.6°C | 106 mm | 77% | 3.9 m/s | 6.8 |
| 2015 | 24.4°C | 20.9°C | 17.4°C | 26.1°C | 15.1°C | 21 mm | 72% | 3.3 m/s | 7.4 |
| 2014 | 22.2°C | 18.9°C | 15.7°C | 25.7°C | 13.4°C | 38 mm | 71% | 5.1 m/s | 6.7 |
| 2013 | 23.1°C | 19.7°C | 16.2°C | 26.1°C | 13.5°C | 9 mm | 70% | 4.8 m/s | 6.9 |
| 2012 | 21.6°C | 18.8°C | 15.9°C | 23.5°C | 12.4°C | 51 mm | 76% | 4.8 m/s | 6.3 |
| 2011 | 24.1°C | 20.9°C | 17.6°C | 26.8°C | 15.9°C | 155 mm | 73% | 4.4 m/s | 6.9 |
| 2010 | 22.9°C | 19.5°C | 16.1°C | 26.1°C | 12.7°C | 51 mm | 72% | 4.2 m/s | 6.9 |
| 2009 | 23.3°C | 20.0°C | 16.7°C | 25.7°C | 14.1°C | 30 mm | 72% | 3.9 m/s | 7 |
| 2008 | 24.5°C | 21.1°C | 17.7°C | 26.9°C | 15.6°C | 21 mm | 72% | 4 m/s | 7.2 |
| 2007 | 22.3°C | 19.4°C | 16.4°C | 25.8°C | 11.7°C | 63 mm | 77% | 4.3 m/s | 6.6 |
| 2006 | 23.1°C | 19.9°C | 16.8°C | 26.4°C | 13.9°C | 80 mm | 74% | 4.8 m/s | 6.5 |
| 2005 | 22.1°C | 19.0°C | 15.8°C | 25.6°C | 13.8°C | 29 mm | 75% | 4.3 m/s | 7 |
| 2004 | 23.9°C | 20.4°C | 17.0°C | 26.2°C | 12.7°C | 57 mm | 75% | 3.7 m/s | 6.5 |
| 2003 | 22.1°C | 19.1°C | 16.1°C | 24.4°C | 11.1°C | 109 mm | 74% | 4.6 m/s | 7.2 |
| 2002 | 22.9°C | 19.8°C | 16.7°C | 25.2°C | 13.4°C | 71 mm | 74% | 4 m/s | 7.1 |
| 2001 | 22.1°C | 19.1°C | 16.1°C | 24.5°C | 13.8°C | 42 mm | 72% | 4.8 m/s | 7 |
| 2000 | 22.5°C | 19.4°C | 16.3°C | 26.3°C | 12.9°C | 87 mm | 74% | 3.9 m/s | 6.7 |
| 1999 | 24.9°C | 21.7°C | 18.5°C | 28.1°C | 16.1°C | 86 mm | 76% | 4.1 m/s | 6.5 |
| 1998 | 22.9°C | 19.6°C | 16.4°C | 26.3°C | 10.4°C | 18 mm | 73% | 4.6 m/s | 6.7 |
| 1997 | 21.3°C | 18.2°C | 15.2°C | 24.2°C | 10.3°C | 22 mm | 73% | 4.9 m/s | 7 |
| 1996 | 23.6°C | 20.4°C | 17.1°C | 25.9°C | 13.2°C | 34 mm | 73% | 4 m/s | 6.9 |
| 1995 | 23.1°C | 19.9°C | 16.6°C | 26.5°C | 10.9°C | 62 mm | 73% | 4.3 m/s | 6.6 |
| 1994 | 24.5°C | 21.0°C | 17.4°C | 27.4°C | 12.3°C | 3 mm | 69% | 4.3 m/s | 7 |
| 1993 | 21.6°C | 18.4°C | 15.3°C | 24.1°C | 12.5°C | 46 mm | 75% | 5.3 m/s | 6.8 |
| 1992 | 22.6°C | 19.4°C | 16.2°C | 24.4°C | 12.8°C | 135 mm | 75% | 4.3 m/s | 6.5 |
| 1991 | 22.2°C | 19.0°C | 15.8°C | 25.6°C | 11.1°C | 34 mm | 74% | 5.2 m/s | 6.3 |
| 1990 | 22.6°C | 19.5°C | 16.5°C | 26.6°C | 14.6°C | 77 mm | 77% | 4.5 m/s | 6.3 |
| 1989 | 22.7°C | 20.1°C | 17.4°C | 26.4°C | 12.9°C | 190 mm | 80% | 5.4 m/s | 6 |
| 1988 | 22.3°C | 18.9°C | 15.5°C | 25.9°C | 13.8°C | 11 mm | 74% | 4.9 m/s | 6.7 |
| 1987 | 23.4°C | 20.1°C | 16.8°C | 25.8°C | 14.5°C | 62 mm | 73% | 4.8 m/s | 6.8 |
| 1986 | 23.7°C | 20.7°C | 17.7°C | 27.5°C | 13.0°C | 146 mm | 76% | 4.4 m/s | 6.5 |
| 1985 | 24.0°C | 20.8°C | 17.5°C | 27.3°C | 15.7°C | 78 mm | 73% | 4.1 m/s | 6.9 |
| 1984 | 21.9°C | 18.5°C | 15.2°C | 24.3°C | 11.5°C | 101 mm | 73% | 4.2 m/s | 6.5 |
| 1983 ❄️ | 21.6°C | 18.2°C | 14.9°C | 25.3°C | 12.4°C | 41 mm | 72% | 5.6 m/s | — |
| 1982 | 23.3°C | 20.0°C | 16.7°C | 25.7°C | 13.4°C | 49 mm | 70% | 4.7 m/s | — |
| 1981 | 24.1°C | 20.8°C | 17.5°C | 26.5°C | 14.3°C | 55 mm | 77% | 3.9 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 23.1°C with lows near 16.7°C (mean 19.9°C), based on 45 years of NASA POWER data.
January averages 69 mm of rainfall in Waiuku, one of the drier months. The wettest on record was 371 mm in 2023.
The hottest January reached 28.1°C in 1999. The coldest dipped to 10.3°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.7°C. Daytime highs moved from 23°C to 23.5°C and overnight lows from 16.4°C to 17.4°C over the same span.
January is one of the warmer months of the year in Waiuku and one of the drier months, so plan for around 23.1°C daytime highs and 16.7°C at night.
Not quite — January is the 11th coolest month in Waiuku, averaging 19.9°C.
For January in Waiuku, pack light layers you can adjust through the day, with typical highs of 23.1°C and lows of 16.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 74% — moderately humid.
Average wind speed in January is 4.5 m/s. The windiest January on record averaged 5.6 m/s (1983).
The wettest January on record was 2023 with 371 mm. On average, January sees 69 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 Waiuku behaves each January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
