January is one of the cooler months of the year in Tucson, with average highs near 17.7°C and lows around 3.9°C (mean 10.8°C). It is about average for rainfall, averaging 29 mm of rainfall and 48% relative humidity across the period.
January is one of the cooler months of the year in Tucson. Across 45 years of records, the warmest January in Tucson was 2018 — when the month averaged 14.7°C — while the coldest were 1985 and 2007 at 7.9°C. Typical January days reach 17.7°C with nights near 3.9°C. The long-term trend is warming, about 0.3°C per decade.
January is about average for rainfall in Tucson, averaging 29 mm of rainfall. The wettest January on record was 1993 with 146 mm, while the driest were 2006 and 2014 at 0 mm.
Relative humidity in Tucson during January averages 48%. The most humid January was 1993 at 75%, and the least humid was 2006 at 27%.
January receives about 3.5 kWh/m²/day of solar energy in Tucson. The sunniest Januarys were 2006 and 2011 at 4 kWh/m²/day, and the cloudiest was 1993 at 2.9.
Average wind speed in Tucson during January is 2.6 m/s. The windiest January was 1992 at 3.7 m/s, while the calmest was 1998 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.2°C | 10.4°C | 11.0°C | 11.6°C | 10.9°C | +0.7°C |
| Avg High | 17.1°C | 17.2°C | 18.0°C | 18.6°C | 17.8°C | +0.7°C |
| Avg Low | 3.3°C | 3.6°C | 4.0°C | 4.6°C | 4.0°C | +0.7°C |
| Avg Rain | 36 mm | 36 mm | 20 mm | 28 mm | 24 mm | -12 mm |
January temperatures in Tucson have risen by about 0.7°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -6.5°C (2007) to a record high of 28.4°C (2000).
Rainfall in January is about average for rainfall, averaging 29 mm, with a wettest year of 146 mm.
A quieter season to visit Tucson
If your dates are flexible, the more temperate months of October and May tend to be the most comfortable for visiting Tucson. That said, January — with days averaging 17.7°C and nights around 3.9°C (mean 10.8°C) and low rainfall (29 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 | 17.6°C | 10.3°C | 3.0°C | 27.6°C | -1.2°C | 3 mm | 29% | 2.7 m/s | 3.9 |
| 2024 | 17.0°C | 10.5°C | 4.0°C | 25.3°C | -4.4°C | 50 mm | 50% | 2.2 m/s | 3.3 |
| 2023 | 16.0°C | 9.5°C | 3.0°C | 24.8°C | -3.1°C | 41 mm | 54% | 2.7 m/s | 3.4 |
| 2022 | 19.0°C | 11.9°C | 4.9°C | 23.6°C | -2.7°C | 5 mm | 42% | 2.5 m/s | 3.7 |
| 2021 | 18.8°C | 11.6°C | 4.3°C | 26.5°C | -2.3°C | 30 mm | 39% | 2.7 m/s | 3.7 |
| 2020 | 18.6°C | 11.5°C | 4.5°C | 24.4°C | 0.2°C | 15 mm | 52% | 2.1 m/s | 3.7 |
| 2019 | 17.8°C | 10.9°C | 4.0°C | 25.7°C | -4.6°C | 19 mm | 53% | 2.1 m/s | 3.5 |
| 2018 🔥 | 22.1°C | 14.7°C | 7.2°C | 26.9°C | 0.1°C | 4 mm | 31% | 2.8 m/s | 3.8 |
| 2017 | 16.6°C | 10.6°C | 4.6°C | 26.0°C | -2.8°C | 47 mm | 56% | 2.5 m/s | 3.3 |
| 2016 | 17.8°C | 10.7°C | 3.6°C | 25.5°C | -1.3°C | 39 mm | 50% | 2.6 m/s | 3.6 |
| 2015 | 18.5°C | 11.9°C | 5.4°C | 25.4°C | -4.6°C | 58 mm | 54% | 2.4 m/s | 3.3 |
| 2014 | 20.9°C | 13.7°C | 6.5°C | 24.7°C | 0.7°C | 0 mm | 33% | 2.2 m/s | 3.9 |
| 2013 | 16.0°C | 9.1°C | 2.1°C | 25.2°C | -5.7°C | 20 mm | 45% | 2.6 m/s | 3.6 |
| 2012 | 19.9°C | 12.4°C | 5.0°C | 25.6°C | 0.5°C | 6 mm | 39% | 2.4 m/s | 3.7 |
| 2011 | 18.4°C | 11.1°C | 3.8°C | 24.6°C | -3.9°C | 1 mm | 38% | 2.1 m/s | 4 |
| 2010 | 17.5°C | 10.8°C | 4.1°C | 22.6°C | -1.0°C | 84 mm | 48% | 3.1 m/s | 3.3 |
| 2009 | 19.2°C | 11.9°C | 4.7°C | 24.7°C | -1.4°C | 15 mm | 46% | 2.4 m/s | 3.8 |
| 2008 | 15.9°C | 9.5°C | 3.0°C | 21.4°C | -3.1°C | 28 mm | 52% | 2.7 m/s | 3.5 |
| 2007 | 14.8°C | 7.9°C | 1.1°C | 24.6°C | -6.5°C | 25 mm | 52% | 2.8 m/s | 3.3 |
| 2006 | 19.7°C | 11.9°C | 4.2°C | 25.7°C | -1.5°C | 0 mm | 27% | 2.6 m/s | 4 |
| 2005 | 18.0°C | 11.6°C | 5.1°C | 25.3°C | -1.0°C | 51 mm | 58% | 2.5 m/s | 3.2 |
| 2004 | 17.4°C | 10.9°C | 4.4°C | 24.2°C | -1.5°C | 25 mm | 53% | 2.3 m/s | 3.3 |
| 2003 | 22.4°C | 14.4°C | 6.4°C | 27.4°C | 1.7°C | 3 mm | 41% | 2.5 m/s | 3.9 |
| 2002 | 17.3°C | 10.2°C | 3.0°C | 26.1°C | -4.2°C | 6 mm | 40% | 2.4 m/s | 3.4 |
| 2001 | 14.9°C | 8.7°C | 2.5°C | 23.6°C | -2.4°C | 44 mm | 60% | 2.3 m/s | 3.3 |
| 2000 | 20.4°C | 13.2°C | 5.9°C | 28.4°C | -1.3°C | 4 mm | 30% | 2.1 m/s | 3.8 |
| 1999 | 19.9°C | 12.1°C | 4.3°C | 28.1°C | -1.3°C | 1 mm | 32% | 2.4 m/s | 3.8 |
| 1998 | 17.8°C | 10.8°C | 3.9°C | 24.5°C | -2.0°C | 4 mm | 53% | 1.8 m/s | 3.7 |
| 1997 | 16.8°C | 10.5°C | 4.3°C | 24.2°C | -3.5°C | 32 mm | 56% | 2.9 m/s | 3.3 |
| 1996 | 19.8°C | 12.1°C | 4.4°C | 26.4°C | -2.1°C | 3 mm | 34% | 2.6 m/s | 3.8 |
| 1995 | 15.1°C | 9.0°C | 3.0°C | 21.5°C | -1.8°C | 47 mm | 67% | 2.7 m/s | 3.2 |
| 1994 | 18.6°C | 11.1°C | 3.6°C | 25.6°C | -1.5°C | 5 mm | 39% | 2.3 m/s | 3.8 |
| 1993 🌧️ | 15.7°C | 10.3°C | 5.0°C | 21.9°C | -2.2°C | 146 mm | 75% | 3.1 m/s | 2.9 |
| 1992 | 15.0°C | 8.5°C | 1.9°C | 21.3°C | -3.1°C | 61 mm | 63% | 3.7 m/s | 3.5 |
| 1991 | 16.1°C | 9.7°C | 3.2°C | 20.6°C | -4.2°C | 34 mm | 56% | 2.2 m/s | 3.4 |
| 1990 | 16.8°C | 9.6°C | 2.3°C | 26.0°C | -3.6°C | 31 mm | 47% | 2.7 m/s | 3.7 |
| 1989 | 15.8°C | 8.8°C | 1.9°C | 21.5°C | -3.6°C | 34 mm | 52% | 2.9 m/s | 3.3 |
| 1988 | 16.8°C | 9.7°C | 2.6°C | 24.1°C | -4.6°C | 32 mm | 50% | 2.8 m/s | 3.4 |
| 1987 | 16.3°C | 9.1°C | 1.9°C | 26.6°C | -5.9°C | 22 mm | 48% | 3 m/s | 3.5 |
| 1986 | 21.2°C | 13.6°C | 6.0°C | 27.0°C | -1.5°C | 15 mm | 44% | 3.1 m/s | 3.7 |
| 1985 ❄️ | 14.0°C | 7.9°C | 1.9°C | 19.9°C | -4.5°C | 54 mm | 68% | 2.9 m/s | 3.3 |
| 1984 | 16.4°C | 9.8°C | 3.2°C | 23.0°C | -1.2°C | 31 mm | 63% | 3 m/s | 3.6 |
| 1983 | 17.9°C | 10.7°C | 3.5°C | 23.5°C | -2.4°C | 54 mm | 56% | 3.1 m/s | — |
| 1982 | 16.7°C | 10.0°C | 3.3°C | 27.8°C | -2.8°C | 49 mm | 54% | 2.9 m/s | — |
| 1981 | 18.6°C | 12.1°C | 5.5°C | 25.6°C | -1.4°C | 34 mm | 49% | 2.7 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 17.7°C with lows near 3.9°C (mean 10.8°C), based on 45 years of NASA POWER data.
January averages 29 mm of rainfall in Tucson, about average for rainfall. The wettest on record was 146 mm in 1993.
The hottest January reached 28.4°C in 2000. The coldest dipped to -6.5°C in 2007.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.7°C. Daytime highs moved from 16.7°C to 17.7°C and overnight lows from 3.5°C to 3.8°C over the same span.
January is one of the cooler months of the year in Tucson and about average for rainfall, so plan for around 17.7°C daytime highs and 3.9°C at night.
Yes — January is the coldest month of the year in Tucson, averaging 10.8°C.
For January in Tucson, pack warm layers and a jacket for chilly mornings, with typical highs of 17.7°C and lows of 3.9°C.
Relative humidity in January averages 48% — relatively dry.
Average wind speed in January is 2.6 m/s. The windiest January on record averaged 3.7 m/s (1992).
The wettest January on record was 1993 with 146 mm. On average, January sees 29 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 Tucson 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.
