January is one of the warmer months of the year in Merredin, with average highs near 35°C and lows around 17.7°C (mean 26.4°C). It is about average for rainfall, averaging 22 mm of rainfall and 36% relative humidity across the period.
January is one of the warmer months of the year in Merredin. Across 45 years of records, the warmest January in Merredin was 2025 — when the month averaged 29.6°C — while the coldest was 2000 at 24.1°C. Typical January days reach 35°C with nights near 17.7°C. The long-term trend is warming, about 0.3°C per decade.
January is about average for rainfall in Merredin, averaging 22 mm of rainfall. The wettest January on record was 2000 with 118 mm, while the driest were 1998, 2005 and 2020, among others at 0 mm.
Relative humidity in Merredin during January averages 36%. The most humid January was 2006 at 52%, and the least humid was 1983 at 29%.
January receives about 8.4 kWh/m²/day of solar energy in Merredin. The sunniest January was 1991 at 9 kWh/m²/day, and the cloudiest was 2016 at 7.3.
Average wind speed in Merredin during January is 4.5 m/s. The windiest Januarys were 2008 and 2021 at 5.1 m/s, while the calmest was 1992 at 3.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.9°C | 26.5°C | 25.9°C | 26.7°C | 27.2°C | +1.3°C |
| Avg High | 34.7°C | 35.4°C | 34.5°C | 35.0°C | 35.9°C | +1.2°C |
| Avg Low | 17.1°C | 17.6°C | 17.3°C | 18.3°C | 18.6°C | +1.5°C |
| Avg Rain | 12 mm | 16 mm | 39 mm | 29 mm | 5 mm | -7 mm |
January temperatures in Merredin have risen by about 1.4°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 7.6°C (1990) to a record high of 45.6°C (2020).
Rainfall in January is about average for rainfall, averaging 22 mm, with a wettest year of 118 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Merredin
January is a good time to visit Merredin, with days averaging 35°C and nights around 17.7°C (mean 26.4°C, warmer than Merredin's yearly average) and low rainfall. November and March 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 🔥 | 38.2°C | 29.6°C | 21.1°C | 44.5°C | 14.2°C | 3 mm | 31% | 4.3 m/s | 8.3 |
| 2024 | 36.4°C | 27.6°C | 18.8°C | 43.1°C | 14.1°C | 12 mm | 38% | 4.5 m/s | 8.3 |
| 2023 | 35.1°C | 26.3°C | 17.5°C | 41.7°C | 12.2°C | 7 mm | 34% | 4.6 m/s | 8.4 |
| 2022 | 36.2°C | 27.3°C | 18.5°C | 43.2°C | 13.3°C | 5 mm | 35% | 4.5 m/s | 8.8 |
| 2021 | 34.2°C | 25.9°C | 17.6°C | 39.9°C | 14.0°C | 2 mm | 34% | 5.1 m/s | 8.4 |
| 2020 | 35.3°C | 26.6°C | 17.9°C | 45.6°C | 10.5°C | 0 mm | 33% | 4.2 m/s | 8.7 |
| 2019 | 35.7°C | 26.7°C | 17.6°C | 44.3°C | 12.3°C | 1 mm | 33% | 4.1 m/s | 8.8 |
| 2018 | 34.4°C | 26.0°C | 17.7°C | 41.7°C | 11.8°C | 34 mm | 42% | 4.8 m/s | 8.2 |
| 2017 | 34.5°C | 25.8°C | 17.1°C | 42.8°C | 12.3°C | 62 mm | 35% | 4 m/s | 8.3 |
| 2016 | 33.5°C | 26.2°C | 18.9°C | 39.0°C | 13.0°C | 51 mm | 45% | 4.1 m/s | 7.3 |
| 2015 | 35.6°C | 27.0°C | 18.3°C | 44.5°C | 12.2°C | 3 mm | 31% | 4.5 m/s | 8.3 |
| 2014 | 35.8°C | 27.6°C | 19.3°C | 45.5°C | 14.0°C | 21 mm | 37% | 4.6 m/s | 8.1 |
| 2013 | 34.2°C | 26.2°C | 18.3°C | 44.6°C | 11.6°C | 59 mm | 42% | 4.2 m/s | 8 |
| 2012 | 33.6°C | 26.1°C | 18.6°C | 39.7°C | 11.6°C | 21 mm | 44% | 4.6 m/s | 7.9 |
| 2011 | 35.7°C | 27.3°C | 19.0°C | 43.1°C | 13.4°C | 34 mm | 42% | 4.3 m/s | 8 |
| 2010 | 37.3°C | 27.8°C | 18.3°C | 45.4°C | 13.0°C | 4 mm | 31% | 4.6 m/s | 8.8 |
| 2009 | 36.8°C | 27.9°C | 18.9°C | 43.3°C | 13.5°C | 31 mm | 39% | 4.4 m/s | 8 |
| 2008 | 36.5°C | 27.7°C | 18.9°C | 45.4°C | 13.3°C | 4 mm | 37% | 5.1 m/s | 8.4 |
| 2007 | 33.5°C | 24.8°C | 16.0°C | 42.3°C | 10.5°C | 22 mm | 39% | 4.2 m/s | 8.2 |
| 2006 | 32.1°C | 24.2°C | 16.2°C | 39.2°C | 9.8°C | 106 mm | 52% | 4.6 m/s | 7.4 |
| 2005 | 35.1°C | 25.7°C | 16.3°C | 43.2°C | 11.8°C | 0 mm | 31% | 4.3 m/s | 8.7 |
| 2004 | 35.8°C | 26.9°C | 17.9°C | 41.1°C | 13.3°C | 16 mm | 40% | 4.5 m/s | 8.4 |
| 2003 | 34.7°C | 25.7°C | 16.8°C | 42.9°C | 10.7°C | 1 mm | 33% | 4.7 m/s | 8.5 |
| 2002 | 33.9°C | 25.3°C | 16.8°C | 39.6°C | 10.3°C | 18 mm | 36% | 4.3 m/s | 8.1 |
| 2001 | 35.5°C | 27.1°C | 18.7°C | 43.4°C | 10.0°C | 72 mm | 43% | 4.2 m/s | 7.5 |
| 2000 ❄️ 🌧️ | 31.4°C | 24.1°C | 16.7°C | 37.6°C | 12.5°C | 118 mm | 50% | 4.3 m/s | 7.7 |
| 1999 | 35.7°C | 27.0°C | 18.4°C | 41.7°C | 10.4°C | 23 mm | 42% | 4.9 m/s | 8.1 |
| 1998 | 36.7°C | 27.3°C | 18.0°C | 44.0°C | 12.5°C | 0 mm | 31% | 4.2 m/s | 8.7 |
| 1997 | 36.1°C | 27.0°C | 18.0°C | 45.4°C | 11.2°C | 0 mm | 31% | 4.8 m/s | 8.6 |
| 1996 | 34.3°C | 25.1°C | 15.8°C | 40.9°C | 10.4°C | 0 mm | 34% | 4.7 m/s | 8.8 |
| 1995 | 35.5°C | 27.1°C | 18.7°C | 42.3°C | 12.6°C | 13 mm | 39% | 4.8 m/s | 8.4 |
| 1994 | 35.1°C | 25.6°C | 16.1°C | 44.9°C | 12.2°C | 1 mm | 33% | 4.5 m/s | 8.9 |
| 1993 | 37.1°C | 27.7°C | 18.2°C | 44.6°C | 12.4°C | 0 mm | 30% | 4.1 m/s | 8.5 |
| 1992 | 34.2°C | 26.0°C | 17.9°C | 40.6°C | 12.9°C | 4 mm | 35% | 3.9 m/s | 8.2 |
| 1991 | 35.6°C | 26.6°C | 17.6°C | 43.9°C | 10.9°C | 16 mm | 34% | 4.4 m/s | 9 |
| 1990 | 33.8°C | 25.4°C | 17.0°C | 43.7°C | 7.6°C | 96 mm | 39% | 4.6 m/s | 8.1 |
| 1989 | 32.9°C | 24.9°C | 16.9°C | 42.1°C | 9.1°C | 16 mm | 37% | 4.6 m/s | 8.2 |
| 1988 | 34.2°C | 25.2°C | 16.3°C | 42.2°C | 8.5°C | 0 mm | 34% | 4.2 m/s | 8.9 |
| 1987 | 34.5°C | 25.6°C | 16.7°C | 41.4°C | 12.1°C | 1 mm | 34% | 4.5 m/s | 8.4 |
| 1986 | 36.7°C | 27.6°C | 18.6°C | 42.1°C | 11.4°C | 5 mm | 30% | 4.4 m/s | 8.8 |
| 1985 | 35.5°C | 26.1°C | 16.8°C | 44.4°C | 11.5°C | 24 mm | 32% | 4.5 m/s | 8.8 |
| 1984 | 34.6°C | 25.7°C | 16.8°C | 41.9°C | 12.1°C | 6 mm | 33% | 4.2 m/s | 8.8 |
| 1983 | 35.6°C | 26.8°C | 18.0°C | 42.6°C | 11.6°C | 3 mm | 29% | 4.2 m/s | — |
| 1982 | 33.2°C | 25.0°C | 16.8°C | 40.7°C | 9.4°C | 42 mm | 42% | 4.5 m/s | — |
| 1981 | 34.7°C | 25.9°C | 17.1°C | 43.2°C | 11.1°C | 10 mm | 35% | 4.9 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 35°C with lows near 17.7°C (mean 26.4°C), based on 45 years of NASA POWER data.
January averages 22 mm of rainfall in Merredin, about average for rainfall. The wettest on record was 118 mm in 2000.
The hottest January reached 45.6°C in 2020. The coldest dipped to 7.6°C in 1990.
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 34.7°C to 36°C and overnight lows from 17.1°C to 18.7°C over the same span.
January is one of the warmer months of the year in Merredin and about average for rainfall, so plan for around 35°C daytime highs and 17.7°C at night.
Not quite — January is the 12th coolest month in Merredin, averaging 26.4°C.
For January in Merredin, pack light, breathable clothing and sun protection, with typical highs of 35°C and lows of 17.7°C.
Relative humidity in January averages 36% — relatively dry.
Average wind speed in January is 4.5 m/s. The windiest January on record averaged 5.1 m/s (2008).
The wettest January on record was 2000 with 118 mm. On average, January sees 22 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 Merredin 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.
