January is one of the warmer months of the year in Greymouth, with average highs near 17.8°C and lows around 12°C (mean 14.9°C). It is about average for rainfall, averaging 159 mm of rainfall and 83% relative humidity across the period.
January is one of the warmer months of the year in Greymouth. Across 45 years of records, the warmest January in Greymouth was 2018 — when the month averaged 18.2°C — while the coldest was 1983 at 12.5°C. Typical January days reach 17.8°C with nights near 12°C. The long-term trend is warming, about 0.2°C per decade.
January is about average for rainfall in Greymouth, averaging 159 mm of rainfall. The wettest January on record was 1991 with 417 mm, while the driest was 2022 at 46 mm.
Relative humidity in Greymouth during January averages 83%. The most humid Januarys were 1991 and 2018 at 86%, and the least humid was 1981 at 78%.
January receives about 6 kWh/m²/day of solar energy in Greymouth. The sunniest January was 2022 at 7.1 kWh/m²/day, and the cloudiest was 2017 at 4.9.
Average wind speed in Greymouth during January is 1.2 m/s. The windiest Januarys were 1983, 1993 and 2017 at 1.5 m/s, while the calmest were 1996 and 2022 at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.0°C | 14.8°C | 14.7°C | 14.9°C | 15.6°C | +0.6°C |
| Avg High | 17.9°C | 17.7°C | 17.6°C | 17.7°C | 18.5°C | +0.6°C |
| Avg Low | 12.1°C | 11.9°C | 11.8°C | 12.1°C | 12.6°C | +0.5°C |
| Avg Rain | 173 mm | 166 mm | 143 mm | 177 mm | 124 mm | -50 mm |
January temperatures in Greymouth have risen by about 1.4°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 5.1°C (1998) to a record high of 24°C (2018).
Rainfall in January is about average for rainfall, averaging 159 mm, with a wettest year of 417 mm.
One of the best times to visit Greymouth
January is one of the best times to visit Greymouth. Expect days averaging 17.8°C and nights around 12°C (mean 14.9°C) — warmer than Greymouth's yearly average — with higher rainfall (159 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 | 18.7°C | 15.5°C | 12.3°C | 21.1°C | 8.6°C | 68 mm | 79% | 1 m/s | 6.9 |
| 2024 | 18.5°C | 15.6°C | 12.8°C | 22.5°C | 9.1°C | 229 mm | 83% | 1.1 m/s | 6.6 |
| 2023 | 20.0°C | 17.0°C | 14.0°C | 22.5°C | 10.4°C | 129 mm | 80% | 1 m/s | 6.5 |
| 2022 | 19.4°C | 16.2°C | 13.0°C | 22.0°C | 9.7°C | 46 mm | 83% | 0.9 m/s | 7.1 |
| 2021 | 17.0°C | 14.4°C | 11.8°C | 20.6°C | 8.3°C | 179 mm | 84% | 1.3 m/s | 6 |
| 2020 | 17.4°C | 14.6°C | 11.8°C | 20.8°C | 9.1°C | 91 mm | 84% | 1.1 m/s | 6.2 |
| 2019 | 18.6°C | 15.7°C | 12.8°C | 21.2°C | 10.0°C | 110 mm | 83% | 1.1 m/s | 6.1 |
| 2018 🔥 | 21.0°C | 18.2°C | 15.4°C | 24.0°C | 10.4°C | 259 mm | 86% | 1 m/s | 5.7 |
| 2017 | 15.6°C | 13.2°C | 10.8°C | 17.5°C | 6.7°C | 319 mm | 85% | 1.5 m/s | 4.9 |
| 2016 | 17.9°C | 15.1°C | 12.3°C | 20.8°C | 8.3°C | 240 mm | 84% | 1 m/s | 5.4 |
| 2015 | 18.7°C | 15.7°C | 12.7°C | 22.2°C | 9.2°C | 73 mm | 81% | 1 m/s | 6.9 |
| 2014 | 15.9°C | 13.2°C | 10.5°C | 19.1°C | 6.8°C | 167 mm | 84% | 1.4 m/s | 5.3 |
| 2013 | 17.4°C | 14.4°C | 11.3°C | 22.0°C | 8.6°C | 133 mm | 83% | 1.3 m/s | 6.1 |
| 2012 | 16.5°C | 13.8°C | 11.1°C | 20.1°C | 6.7°C | 132 mm | 82% | 1.3 m/s | 5.8 |
| 2011 | 17.9°C | 15.0°C | 12.1°C | 20.7°C | 8.1°C | 177 mm | 83% | 1.3 m/s | 5.6 |
| 2010 | 17.4°C | 14.5°C | 11.5°C | 20.7°C | 7.8°C | 161 mm | 83% | 1.2 m/s | 5.6 |
| 2009 | 17.7°C | 14.8°C | 11.9°C | 20.9°C | 8.8°C | 58 mm | 83% | 1.1 m/s | 6.2 |
| 2008 | 19.1°C | 15.9°C | 12.7°C | 22.6°C | 9.4°C | 127 mm | 82% | 1 m/s | 6.6 |
| 2007 | 17.1°C | 14.5°C | 11.9°C | 21.6°C | 7.2°C | 154 mm | 86% | 1.1 m/s | 5.4 |
| 2006 | 16.8°C | 13.9°C | 10.9°C | 22.8°C | 7.2°C | 160 mm | 83% | 1.3 m/s | 6.2 |
| 2005 | 17.4°C | 14.7°C | 12.0°C | 22.7°C | 9.3°C | 100 mm | 84% | 1 m/s | 5.8 |
| 2004 | 18.2°C | 15.4°C | 12.6°C | 21.6°C | 8.8°C | 209 mm | 84% | 1.1 m/s | 6.3 |
| 2003 | 16.9°C | 14.0°C | 11.1°C | 20.7°C | 6.6°C | 166 mm | 83% | 1.2 m/s | 6.1 |
| 2002 | 18.1°C | 15.4°C | 12.7°C | 21.7°C | 9.8°C | 165 mm | 84% | 1.2 m/s | 5.8 |
| 2001 | 16.5°C | 13.4°C | 10.4°C | 19.5°C | 7.2°C | 103 mm | 81% | 1.2 m/s | 6.2 |
| 2000 | 17.7°C | 14.8°C | 11.8°C | 20.3°C | 8.5°C | 185 mm | 82% | 1.1 m/s | 6.1 |
| 1999 | 20.0°C | 16.7°C | 13.4°C | 23.2°C | 9.7°C | 85 mm | 81% | 1.1 m/s | 6.6 |
| 1998 | 17.1°C | 14.4°C | 11.7°C | 20.8°C | 5.1°C | 96 mm | 84% | 1.2 m/s | 5.8 |
| 1997 | 17.5°C | 14.5°C | 11.6°C | 21.1°C | 7.4°C | 77 mm | 80% | 1.1 m/s | 6.5 |
| 1996 | 19.2°C | 16.1°C | 13.0°C | 21.5°C | 7.5°C | 94 mm | 81% | 0.9 m/s | 6.3 |
| 1995 | 18.0°C | 15.0°C | 12.0°C | 21.8°C | 6.1°C | 133 mm | 81% | 1.1 m/s | 6.6 |
| 1994 | 17.3°C | 14.6°C | 12.0°C | 19.3°C | 8.2°C | 295 mm | 84% | 1.4 m/s | 5.4 |
| 1993 | 15.8°C | 13.1°C | 10.3°C | 17.9°C | 7.8°C | 201 mm | 82% | 1.5 m/s | 5.6 |
| 1992 | 17.8°C | 14.7°C | 11.7°C | 20.8°C | 6.8°C | 89 mm | 81% | 1.2 m/s | 6.4 |
| 1991 🌧️ | 17.0°C | 14.3°C | 11.7°C | 20.8°C | 7.4°C | 417 mm | 86% | 1.2 m/s | 5 |
| 1990 | 17.4°C | 14.5°C | 11.6°C | 20.0°C | 9.0°C | 170 mm | 82% | 1.2 m/s | 5.7 |
| 1989 | 20.1°C | 16.9°C | 13.8°C | 23.2°C | 9.1°C | 202 mm | 81% | 1.1 m/s | 6.2 |
| 1988 | 17.5°C | 14.5°C | 11.4°C | 20.0°C | 8.0°C | 96 mm | 83% | 1.1 m/s | 6.1 |
| 1987 | 18.6°C | 15.6°C | 12.6°C | 21.9°C | 9.0°C | 346 mm | 82% | 1.2 m/s | 6 |
| 1986 | 19.0°C | 16.4°C | 13.8°C | 22.3°C | 9.4°C | 221 mm | 84% | 1.2 m/s | 5.7 |
| 1985 | 18.0°C | 15.3°C | 12.7°C | 22.3°C | 10.6°C | 182 mm | 84% | 1.3 m/s | 5.6 |
| 1984 | 16.5°C | 13.5°C | 10.5°C | 19.6°C | 6.8°C | 111 mm | 80% | 1.3 m/s | 5.9 |
| 1983 ❄️ | 15.0°C | 12.5°C | 10.0°C | 20.1°C | 7.5°C | 197 mm | 85% | 1.5 m/s | — |
| 1982 | 17.1°C | 14.2°C | 11.3°C | 20.5°C | 8.8°C | 153 mm | 83% | 1.4 m/s | — |
| 1981 | 19.6°C | 16.1°C | 12.7°C | 23.5°C | 7.8°C | 53 mm | 78% | 1.1 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 17.8°C with lows near 12°C (mean 14.9°C), based on 45 years of NASA POWER data.
January averages 159 mm of rainfall in Greymouth, about average for rainfall. The wettest on record was 417 mm in 1991.
The hottest January reached 24°C in 2018. The coldest dipped to 5.1°C in 1998.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1.4°C. Daytime highs moved from 17.2°C to 18.7°C and overnight lows from 11.4°C to 12.8°C over the same span.
January is one of the warmer months of the year in Greymouth and about average for rainfall, so plan for around 17.8°C daytime highs and 12°C at night.
Not quite — January is the 11th coolest month in Greymouth, averaging 14.9°C.
For January in Greymouth, pack light layers you can adjust through the day, with typical highs of 17.8°C and lows of 12°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 83% — quite humid.
Average wind speed in January is 1.2 m/s. The windiest January on record averaged 1.5 m/s (1983).
The wettest January on record was 1991 with 417 mm. On average, January sees 159 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 Greymouth 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.
