Climate averages 1991–2020
Tucson weather
by month.
See how the year changes. June has the highest average daily maximum; May has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: FebruaryMarchAprilNovember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Tucson averages a daytime high of 27.8°C and a nighttime low of 14.0°C, with about 238 mm of rain on roughly 42 days. June is the warmest month (average high 37.5°C) and December the coolest (17.1°C). July (tied with August) is the wettest month with 33 mm; May is the driest with 2.7 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): February, March, April and November. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Tucson
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 | 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
Nearby cities
- NogalesMexico · 102 kmHigh 25.0°C · Low 10.7°C · 433 mm rain a year
- San Tan ValleyUnited States · 122 kmHigh 28.9°C · Low 14.9°C · 266 mm rain a year
- ChandlerUnited States · 148 kmHigh 29.8°C · Low 15.0°C · 234 mm rain a year
- MesaUnited States · 158 kmHigh 29.5°C · Low 14.8°C · 270 mm rain a year
- TempeUnited States · 161 kmHigh 29.6°C · Low 15.2°C · 248 mm rain a year
- Agua PrietaMexico · 165 kmHigh 25.7°C · Low 11.7°C · 278 mm rain a year
- ScottsdaleUnited States · 170 kmHigh 29.3°C · Low 15.2°C · 248 mm rain a year
- PhoenixUnited States · 173 kmHigh 29.7°C · Low 15.4°C · 248 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-7, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 32.20°, -110.90° (4 km from the city centre), adjusted down by 0.2°C for the difference between the city's elevation (757 m) and the cell's (728 m). Rain comes from the 0.25° cell at 32.25°, -111.00°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.