Climate averages 1991–2020
Tucson weather
in January.
A mild, fairly dry month: the 11th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a mild month in Tucson: daytime highs average 17.6°C and nights cool to about 4.0°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 29 mm of rain on roughly 4 days, which makes January a fairly dry month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 18 min on an average January day.
The nearest other city in this atlas is Nogales (102 km away). In January its highs average 16.3°C, 1.3°C cooler than Tucson, with 35 mm of rain.
Among the 498 cities listed in the United States, Tucson ranks joint 82nd of 498 for the warmest January highs and joint 56th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Tucson is 8.1°C warmer than that mean.
From January to February, average highs rise by 1.7°C to 19.3°C, and monthly rainfall falls from 29 mm to 28 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Tucson climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 17.6°C4.0°C | 4.0°C | 29 | 4.0 | 10.310 h |
| February | 19.3°C5.4°C | 5.4°C | 28 | 3.8 | 11.011 h |
| March | 23.3°C8.5°C | 8.5°C | 17 | 3.0 | 12.012 h |
| April | 27.6°C12.3°C | 12.3°C | 6.0 | 1.4 | 12.913 h |
| May | 32.4°C17.2°C | 17.2°C | 2.7 | 0.8 | 13.814 h |
| June | 37.5°C22.6°C | 22.6°C | 4.6 | 1.2 | 14.214 h |
| July | 36.8°C25.1°C | 25.1°C | 33 | 7.8 | 14.014 h |
| August | 36.0°C24.4°C | 24.4°C | 33 | 7.5 | 13.313 h |
| September | 34.1°C21.3°C | 21.3°C | 25 | 3.7 | 12.412 h |
| October | 29.2°C14.9°C | 14.9°C | 14 | 2.3 | 11.411 h |
| November | 22.6°C8.5°C | 8.5°C | 17 | 2.5 | 10.511 h |
| December | 17.1°C3.8°C | 3.8°C | 31 | 4.3 | 10.110 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Nogales in JanuaryMexico · 102 kmHigh 16.3°C · Low 2.1°C · 35 mm rain
- San Tan Valley in JanuaryUnited States · 122 kmHigh 18.2°C · Low 4.9°C · 38 mm rain
- Chandler in JanuaryUnited States · 148 kmHigh 18.8°C · Low 4.6°C · 32 mm rain
- Mesa in JanuaryUnited States · 158 kmHigh 18.5°C · Low 4.3°C · 40 mm rain
- Tempe in JanuaryUnited States · 161 kmHigh 18.6°C · Low 4.4°C · 32 mm rain
- Agua Prieta in JanuaryMexico · 165 kmHigh 16.3°C · Low 2.3°C · 27 mm rain
- Scottsdale in JanuaryUnited States · 170 kmHigh 18.4°C · Low 4.7°C · 32 mm rain
- Phoenix in JanuaryUnited States · 173 kmHigh 18.6°C · Low 4.6°C · 32 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Tucson) is explained once on the Tucson year overview and on the Sources, method and limits page.