January is one of the warmer months of the year in Grafton, with average highs near 28.6°C and lows around 21.2°C (mean 24.9°C). It is a relatively wet time of year, averaging 150 mm of rainfall and 72% relative humidity across the period.
January is one of the warmer months of the year in Grafton. Across 45 years of records, the warmest January in Grafton was 2019 — when the month averaged 27.4°C — while the coldest were 1984 and 1989 at 23°C. Typical January days reach 28.6°C with nights near 21.2°C. The long-term trend is warming, about 0.2°C per decade.
January is a relatively wet time of year in Grafton, averaging 150 mm of rainfall. The wettest January on record was 2012 with 362 mm, while the driest was 2019 at 10 mm.
Relative humidity in Grafton during January averages 72%. The most humid January was 2008 at 82%, and the least humid was 2019 at 62%.
January receives about 6.4 kWh/m²/day of solar energy in Grafton. The sunniest January was 2018 at 7.5 kWh/m²/day, and the cloudiest were 1984 and 2008 at 5.3.
Average wind speed in Grafton during January is 3 m/s. The windiest Januarys were 1995, 2003 and 2013 at 3.5 m/s, while the calmest were 2010, 2015 and 2021, among others at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.5°C | 24.9°C | 24.9°C | 25.4°C | 24.8°C | +0.3°C |
| Avg High | 28.2°C | 28.6°C | 28.5°C | 29.2°C | 28.2°C | 0°C |
| Avg Low | 20.7°C | 21.3°C | 21.2°C | 21.6°C | 21.5°C | +0.8°C |
| Avg Rain | 146 mm | 128 mm | 148 mm | 158 mm | 181 mm | +35 mm |
January temperatures in Grafton have stayed relatively stable across the record.
January has ranged from a record low of 17.3°C (1997) to a record high of 40.7°C (2002).
Rainfall in January is a relatively wet time of year, averaging 150 mm, with a wettest year of 362 mm.
A good time to visit Grafton
January is a good time to visit Grafton, with days averaging 28.6°C and nights around 21.2°C (mean 24.9°C, warmer than Grafton's yearly average) and higher rainfall. November and October are marginally more temperate, but January still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.6°C | 25.0°C | 21.4°C | 35.9°C | 18.3°C | 183 mm | 73% | 2.9 m/s | 6.3 |
| 2024 | 28.6°C | 25.6°C | 22.6°C | 34.8°C | 20.2°C | 216 mm | 79% | 3 m/s | 5.8 |
| 2023 | 28.5°C | 24.6°C | 20.8°C | 33.7°C | 18.9°C | 149 mm | 71% | 2.8 m/s | 6.4 |
| 2022 | 26.8°C | 24.1°C | 21.3°C | 29.7°C | 19.4°C | 176 mm | 79% | 3.2 m/s | 5.9 |
| 2021 | 26.6°C | 23.5°C | 20.5°C | 30.1°C | 18.8°C | 161 mm | 78% | 2.7 m/s | 6.5 |
| 2020 | 29.9°C | 26.1°C | 22.4°C | 34.9°C | 20.5°C | 202 mm | 74% | 2.9 m/s | 6.4 |
| 2019 🔥 | 31.6°C | 27.4°C | 23.1°C | 36.6°C | 21.3°C | 10 mm | 62% | 3.1 m/s | 7.3 |
| 2018 | 30.0°C | 25.7°C | 21.3°C | 38.9°C | 17.3°C | 66 mm | 67% | 3 m/s | 7.5 |
| 2017 | 30.5°C | 26.4°C | 22.3°C | 38.3°C | 20.0°C | 195 mm | 72% | 3.1 m/s | 6.4 |
| 2016 | 28.7°C | 24.7°C | 20.7°C | 35.3°C | 18.3°C | 119 mm | 70% | 2.9 m/s | 6.4 |
| 2015 | 28.3°C | 25.0°C | 21.6°C | 33.2°C | 18.8°C | 194 mm | 75% | 2.7 m/s | 6.2 |
| 2014 | 29.1°C | 25.1°C | 21.2°C | 37.7°C | 19.2°C | 59 mm | 65% | 2.9 m/s | 6.3 |
| 2013 | 29.9°C | 26.0°C | 22.1°C | 39.0°C | 19.8°C | 308 mm | 70% | 3.5 m/s | 6 |
| 2012 🌧️ | 26.8°C | 23.8°C | 20.8°C | 33.3°C | 18.1°C | 362 mm | 75% | 3.3 m/s | 5.6 |
| 2011 | 26.6°C | 23.8°C | 21.0°C | 30.5°C | 18.2°C | 196 mm | 80% | 3 m/s | 6 |
| 2010 | 30.3°C | 26.1°C | 21.9°C | 36.7°C | 18.5°C | 72 mm | 67% | 2.7 m/s | 7.1 |
| 2009 | 28.7°C | 25.0°C | 21.2°C | 35.6°C | 18.3°C | 60 mm | 68% | 3 m/s | 6.3 |
| 2008 | 26.2°C | 23.8°C | 21.4°C | 28.4°C | 19.3°C | 282 mm | 82% | 3.3 m/s | 5.3 |
| 2007 | 29.1°C | 25.1°C | 21.1°C | 35.8°C | 18.6°C | 105 mm | 70% | 2.9 m/s | 6.5 |
| 2006 | 27.9°C | 25.1°C | 22.2°C | 38.4°C | 20.6°C | 269 mm | 79% | 2.8 m/s | 6 |
| 2005 | 28.8°C | 25.1°C | 21.3°C | 36.0°C | 18.1°C | 181 mm | 71% | 3.2 m/s | 6.4 |
| 2004 | 29.4°C | 25.6°C | 21.8°C | 39.7°C | 18.2°C | 241 mm | 74% | 2.8 m/s | 6.5 |
| 2003 | 29.0°C | 24.7°C | 20.5°C | 36.7°C | 18.0°C | 22 mm | 63% | 3.5 m/s | 7.2 |
| 2002 | 30.0°C | 25.7°C | 21.4°C | 40.7°C | 18.5°C | 57 mm | 64% | 3.4 m/s | 6.8 |
| 2001 | 29.1°C | 25.3°C | 21.5°C | 34.5°C | 19.0°C | 131 mm | 69% | 3 m/s | 6.8 |
| 2000 | 26.8°C | 23.4°C | 19.9°C | 36.7°C | 17.9°C | 136 mm | 73% | 3.2 m/s | 6.4 |
| 1999 | 28.2°C | 25.0°C | 21.7°C | 31.8°C | 20.1°C | 191 mm | 74% | 2.8 m/s | 6.4 |
| 1998 | 30.0°C | 26.3°C | 22.5°C | 35.9°C | 20.3°C | 64 mm | 66% | 2.9 m/s | 6.4 |
| 1997 | 26.3°C | 23.1°C | 19.8°C | 31.2°C | 17.3°C | 103 mm | 69% | 3.4 m/s | 6.1 |
| 1996 | 27.1°C | 24.2°C | 21.3°C | 32.3°C | 18.5°C | 288 mm | 81% | 2.7 m/s | 6.2 |
| 1995 | 27.6°C | 24.0°C | 20.4°C | 33.4°C | 18.3°C | 107 mm | 71% | 3.5 m/s | 6.3 |
| 1994 | 30.3°C | 26.1°C | 21.9°C | 39.5°C | 19.0°C | 69 mm | 64% | 3.3 m/s | 6.5 |
| 1993 | 30.1°C | 26.0°C | 21.8°C | 33.8°C | 19.2°C | 73 mm | 69% | 2.9 m/s | 6.6 |
| 1992 | 27.4°C | 23.9°C | 20.4°C | 32.2°C | 17.6°C | 160 mm | 78% | 3 m/s | 6.7 |
| 1991 | 29.9°C | 26.0°C | 22.2°C | 33.8°C | 19.8°C | 120 mm | 68% | 3 m/s | 6.6 |
| 1990 | 28.8°C | 24.7°C | 20.5°C | 37.2°C | 17.4°C | 108 mm | 69% | 3.1 m/s | 6.3 |
| 1989 | 26.0°C | 23.0°C | 20.0°C | 32.6°C | 17.5°C | 278 mm | 76% | 3 m/s | 6.2 |
| 1988 | 27.3°C | 24.0°C | 20.7°C | 30.6°C | 18.3°C | 233 mm | 75% | 3.2 m/s | 6.3 |
| 1987 | 30.7°C | 26.5°C | 22.4°C | 35.8°C | 20.2°C | 135 mm | 70% | 2.9 m/s | 6.5 |
| 1986 | 28.6°C | 24.4°C | 20.2°C | 33.7°C | 17.8°C | 109 mm | 66% | 3.1 m/s | 6.7 |
| 1985 | 30.0°C | 25.3°C | 20.5°C | 34.1°C | 17.8°C | 70 mm | 64% | 3 m/s | 7.4 |
| 1984 ❄️ | 26.1°C | 23.0°C | 19.9°C | 31.1°C | 17.9°C | 153 mm | 77% | 3.1 m/s | 5.3 |
| 1983 | 28.2°C | 24.1°C | 20.1°C | 34.3°C | 18.4°C | 72 mm | 68% | 2.8 m/s | — |
| 1982 | 28.6°C | 25.1°C | 21.6°C | 36.3°C | 19.5°C | 232 mm | 75% | 3 m/s | — |
| 1981 | 28.4°C | 24.7°C | 21.0°C | 33.1°C | 18.5°C | 33 mm | 69% | 2.7 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 28.6°C with lows near 21.2°C (mean 24.9°C), based on 45 years of NASA POWER data.
January averages 150 mm of rainfall in Grafton, a relatively wet time of year. The wettest on record was 362 mm in 2012.
The hottest January reached 40.7°C in 2002. The coldest dipped to 17.3°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.2°C — but days and nights have moved in opposite directions. Overnight lows rose from 20.6°C to 21.3°C while daytime highs eased from 28.3°C to 27.8°C, narrowing the gap between day and night.
January is one of the warmer months of the year in Grafton and a relatively wet time of year, so plan for around 28.6°C daytime highs and 21.2°C at night.
Not quite — January is the 12th coolest month in Grafton, averaging 24.9°C.
For January in Grafton, pack light layers you can adjust through the day, with typical highs of 28.6°C and lows of 21.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 72% — moderately humid.
Average wind speed in January is 3 m/s. The windiest January on record averaged 3.5 m/s (1995).
The wettest January on record was 2012 with 362 mm. On average, January sees 150 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 Grafton 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.
