Climate averages 1991–2020
Tucson weather
in August.
A very hot, fairly dry month: the 3rd warmest and one of the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a very hot month in Tucson: daytime highs average 36.0°C and nights cool to about 24.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 33 mm of rain on roughly 8 days, which makes August a fairly dry month (one of the wettest months of the year). Daylight, from sunrise to sunset, lasts about 13 h 20 min on an average August day.
The nearest other city in this atlas is Nogales (102 km away). In August its highs average 31.4°C, 4.6°C cooler than Tucson, with 92 mm of rain.
Among the 498 cities listed in the United States, Tucson ranks joint 21st of 498 for the warmest August highs and joint 157th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Tucson is 6.1°C warmer than that mean.
From August to September, average highs fall by 1.9°C to 34.1°C, and monthly rainfall falls from 33 mm to 25 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Nogales in AugustMexico · 102 kmHigh 31.4°C · Low 19.5°C · 92 mm rain
- San Tan Valley in AugustUnited States · 122 kmHigh 38.4°C · Low 26.2°C · 27 mm rain
- Chandler in AugustUnited States · 148 kmHigh 39.7°C · Low 26.8°C · 26 mm rain
- Mesa in AugustUnited States · 158 kmHigh 39.3°C · Low 26.9°C · 25 mm rain
- Tempe in AugustUnited States · 161 kmHigh 39.5°C · Low 27.3°C · 29 mm rain
- Agua Prieta in AugustMexico · 165 kmHigh 32.7°C · Low 20.6°C · 46 mm rain
- Scottsdale in AugustUnited States · 170 kmHigh 39.3°C · Low 27.2°C · 29 mm rain
- Phoenix in AugustUnited States · 173 kmHigh 39.6°C · Low 27.5°C · 29 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.