January is one of the cooler months of the year in Mesa, with average highs near 19°C and lows around 5.1°C (mean 12.1°C). It is about average for rainfall, averaging 35 mm of rainfall and 47% relative humidity across the period.
January is one of the cooler months of the year in Mesa. Across 45 years of records, the warmest January in Mesa was 2003 — when the month averaged 16°C — while the coldest was 1992 at 9.8°C. Typical January days reach 19°C with nights near 5.1°C. The long-term trend is warming, about 0.2°C per decade.
January is about average for rainfall in Mesa, averaging 35 mm of rainfall. The wettest January on record was 1993 with 170 mm, while the driest was 2014 at 0 mm.
Relative humidity in Mesa during January averages 47%. The most humid January was 1993 at 73%, and the least humid was 2025 at 25%.
January receives about 3.4 kWh/m²/day of solar energy in Mesa. The sunniest Januarys were 2006 and 2011 at 3.8 kWh/m²/day, and the cloudiest was 1993 at 2.8.
Average wind speed in Mesa during January is 2 m/s. The windiest January was 1992 at 2.7 m/s, while the calmest was 1998 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 11.5°C | 12.4°C | 12.6°C | 11.9°C | +0.2°C |
| Avg High | 18.7°C | 18.4°C | 19.4°C | 19.6°C | 18.8°C | +0.1°C |
| Avg Low | 4.7°C | 4.5°C | 5.4°C | 5.6°C | 5.1°C | +0.4°C |
| Avg Rain | 32 mm | 47 mm | 28 mm | 39 mm | 23 mm | -9 mm |
January temperatures in Mesa have stayed relatively stable across the record.
January has ranged from a record low of -6.1°C (2007) to a record high of 30°C (2003).
Rainfall in January is about average for rainfall, averaging 35 mm, with a wettest year of 170 mm.
A quieter season to visit Mesa
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting Mesa. That said, January — with days averaging 19°C and nights around 5.1°C (mean 12.1°C) and moderate rainfall (35 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.1°C | 11.8°C | 4.5°C | 26.1°C | -1.5°C | 2 mm | 25% | 2 m/s | 3.7 |
| 2024 | 17.7°C | 11.4°C | 5.1°C | 26.4°C | -2.3°C | 30 mm | 50% | 1.6 m/s | 3.1 |
| 2023 | 16.5°C | 10.4°C | 4.3°C | 23.9°C | -1.8°C | 61 mm | 57% | 1.8 m/s | 3.2 |
| 2022 | 20.2°C | 12.8°C | 5.5°C | 23.1°C | -2.2°C | 7 mm | 43% | 1.9 m/s | 3.7 |
| 2021 | 19.7°C | 12.6°C | 5.5°C | 26.8°C | -0.1°C | 33 mm | 38% | 2 m/s | 3.4 |
| 2020 | 19.6°C | 12.5°C | 5.5°C | 24.6°C | 1.9°C | 6 mm | 49% | 1.7 m/s | 3.5 |
| 2019 | 19.1°C | 12.3°C | 5.4°C | 24.3°C | -3.7°C | 26 mm | 51% | 1.7 m/s | 3.3 |
| 2018 | 22.9°C | 15.6°C | 8.4°C | 27.9°C | 1.3°C | 12 mm | 30% | 2.1 m/s | 3.6 |
| 2017 | 17.2°C | 11.6°C | 5.9°C | 24.2°C | -1.6°C | 62 mm | 59% | 1.8 m/s | 2.9 |
| 2016 | 18.2°C | 11.5°C | 4.9°C | 22.9°C | 0.6°C | 63 mm | 51% | 2 m/s | 3.4 |
| 2015 | 19.9°C | 13.3°C | 6.8°C | 27.7°C | -2.3°C | 42 mm | 50% | 1.9 m/s | 3.1 |
| 2014 | 22.1°C | 14.3°C | 6.5°C | 25.2°C | 1.5°C | 0 mm | 36% | 1.8 m/s | 3.7 |
| 2013 | 17.5°C | 10.3°C | 3.1°C | 26.3°C | -4.7°C | 56 mm | 44% | 2 m/s | 3.5 |
| 2012 | 21.0°C | 13.3°C | 5.6°C | 26.7°C | 0.4°C | 3 mm | 38% | 2 m/s | 3.5 |
| 2011 | 19.4°C | 11.6°C | 3.9°C | 24.1°C | -5.7°C | 0 mm | 42% | 2 m/s | 3.8 |
| 2010 | 18.3°C | 11.9°C | 5.6°C | 22.4°C | -0.2°C | 122 mm | 51% | 2.2 m/s | 3.1 |
| 2009 | 20.4°C | 13.1°C | 5.8°C | 27.0°C | -0.3°C | 11 mm | 49% | 1.9 m/s | 3.6 |
| 2008 | 16.4°C | 9.9°C | 3.5°C | 21.0°C | -2.2°C | 77 mm | 54% | 2 m/s | 3.3 |
| 2007 | 16.7°C | 9.9°C | 3.0°C | 24.8°C | -6.1°C | 22 mm | 45% | 2 m/s | 3.2 |
| 2006 | 20.8°C | 13.2°C | 5.6°C | 26.5°C | -0.7°C | 0 mm | 25% | 2 m/s | 3.8 |
| 2005 | 18.9°C | 12.8°C | 6.7°C | 26.2°C | 0.0°C | 76 mm | 62% | 1.8 m/s | 3 |
| 2004 | 19.3°C | 12.7°C | 6.1°C | 26.0°C | -0.2°C | 18 mm | 47% | 1.9 m/s | 3.1 |
| 2003 🔥 | 23.9°C | 16.0°C | 8.1°C | 30.0°C | 2.7°C | 8 mm | 41% | 1.9 m/s | 3.7 |
| 2002 | 18.8°C | 11.5°C | 4.2°C | 26.2°C | -3.1°C | 5 mm | 38% | 1.8 m/s | 3.3 |
| 2001 | 16.9°C | 10.5°C | 4.1°C | 24.1°C | -1.5°C | 55 mm | 54% | 1.8 m/s | 3.2 |
| 2000 | 21.4°C | 13.9°C | 6.4°C | 28.3°C | -1.2°C | 3 mm | 30% | 1.7 m/s | 3.5 |
| 1999 | 20.9°C | 13.2°C | 5.4°C | 24.8°C | -0.1°C | 3 mm | 34% | 2 m/s | 3.6 |
| 1998 | 19.0°C | 12.1°C | 5.2°C | 24.2°C | 0.3°C | 14 mm | 50% | 1.5 m/s | 3.4 |
| 1997 | 17.9°C | 11.4°C | 4.9°C | 25.4°C | -0.7°C | 47 mm | 55% | 2 m/s | 3.1 |
| 1996 | 20.4°C | 12.6°C | 4.7°C | 27.7°C | -0.7°C | 7 mm | 30% | 1.9 m/s | 3.4 |
| 1995 | 16.1°C | 10.2°C | 4.4°C | 22.8°C | -1.2°C | 82 mm | 65% | 1.9 m/s | 3 |
| 1994 | 20.1°C | 12.2°C | 4.3°C | 26.2°C | -0.5°C | 4 mm | 40% | 2 m/s | 3.6 |
| 1993 🌧️ | 16.7°C | 11.4°C | 6.2°C | 21.3°C | -1.3°C | 170 mm | 73% | 2.2 m/s | 2.8 |
| 1992 ❄️ | 16.8°C | 9.8°C | 2.8°C | 23.6°C | -2.9°C | 82 mm | 62% | 2.7 m/s | 3.5 |
| 1991 | 17.8°C | 10.9°C | 4.0°C | 22.4°C | -2.7°C | 27 mm | 52% | 1.8 m/s | 3.4 |
| 1990 | 18.2°C | 10.9°C | 3.5°C | 26.9°C | -1.2°C | 32 mm | 46% | 2 m/s | 3.6 |
| 1989 | 17.9°C | 10.9°C | 3.9°C | 24.4°C | -2.7°C | 53 mm | 48% | 2.2 m/s | 3.3 |
| 1988 | 17.5°C | 10.4°C | 3.4°C | 24.7°C | -3.4°C | 41 mm | 52% | 2.2 m/s | 3.2 |
| 1987 | 17.6°C | 10.4°C | 3.2°C | 26.4°C | -4.0°C | 34 mm | 48% | 2 m/s | 3.4 |
| 1986 | 22.6°C | 15.0°C | 7.4°C | 27.4°C | 2.1°C | 8 mm | 46% | 2.2 m/s | 3.5 |
| 1985 | 16.4°C | 10.0°C | 3.6°C | 20.6°C | -3.7°C | 38 mm | 62% | 1.9 m/s | 3.2 |
| 1984 | 19.1°C | 12.0°C | 4.8°C | 25.9°C | -2.1°C | 10 mm | 50% | 2.4 m/s | 3.5 |
| 1983 | 19.1°C | 11.9°C | 4.8°C | 25.4°C | -0.9°C | 37 mm | 55% | 2.1 m/s | — |
| 1982 | 17.5°C | 10.6°C | 3.7°C | 27.5°C | -1.7°C | 39 mm | 53% | 1.9 m/s | — |
| 1981 | 20.4°C | 13.7°C | 7.1°C | 26.1°C | 1.7°C | 24 mm | 42% | 2.2 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 19°C with lows near 5.1°C (mean 12.1°C), based on 45 years of NASA POWER data.
January averages 35 mm of rainfall in Mesa, about average for rainfall. The wettest on record was 170 mm in 1993.
The hottest January reached 30°C in 2003. The coldest dipped to -6.1°C in 2007.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.2°C. Daytime highs moved from 18.5°C to 18.6°C and overnight lows from 4.8°C to 5°C over the same span.
January is one of the cooler months of the year in Mesa and about average for rainfall, so plan for around 19°C daytime highs and 5.1°C at night.
Yes — January is the coldest month of the year in Mesa, averaging 12.1°C.
For January in Mesa, pack warm layers and a jacket for chilly mornings, with typical highs of 19°C and lows of 5.1°C.
Relative humidity in January averages 47% — relatively dry.
Average wind speed in January is 2 m/s. The windiest January on record averaged 2.7 m/s (1992).
The wettest January on record was 1993 with 170 mm. On average, January sees 35 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 Mesa 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.
