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Tucson, Arizona climate
BSh Hot semi-arid
Tucson has a seasonal warm-temperate climate (Hot semi-arid, Köppen BSh). The hottest month is July with an average daily high near 38°C, while the coldest is December averaging around 5°C at night. Precipitation totals about 294 mm a year and is strongly seasonal — August alone averages 67 mm while May barely receives 4 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsTucson climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 19 | 21 | 24 | 28 | 33 | 38 | 38 | 37 | 35 | 30 | 24 | 18 |
| Avg temp (°C) | 12 | 14 | 17 | 21 | 25 | 30 | 31 | 31 | 29 | 23 | 17 | 12 |
| Avg low (°C) | 6 | 7 | 10 | 13 | 18 | 23 | 25 | 25 | 22 | 16 | 10 | 5 |
| Precipitation (mm) | 22 | 21 | 14 | 8 | 4 | 7 | 52 | 67 | 43 | 15 | 16 | 23 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 19 | 21 | 24 | 28 | 33 | 38 |
| Avg temp (°C) | 12 | 14 | 17 | 21 | 25 | 30 |
| Avg low (°C) | 6 | 7 | 10 | 13 | 18 | 23 |
| Precipitation (mm) | 22 | 21 | 14 | 8 | 4 | 7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 38 | 37 | 35 | 30 | 24 | 18 |
| Avg temp (°C) | 31 | 31 | 29 | 23 | 17 | 12 |
| Avg low (°C) | 25 | 25 | 22 | 16 | 10 | 5 |
| Precipitation (mm) | 52 | 67 | 43 | 15 | 16 | 23 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 4 | 1 | 1 | 2 | 8 | 9 | 3 | 3 | 2 | 4 |
| Days with high ≥ 32°C (days) | — | — | 0.6 | 6 | 21 | 27 | 28 | 27 | 23 | 11 | 0.2 | — |
| Days with low ≤ 0°C (days) | 2 | 0.5 | 0.1 | — | — | — | — | — | — | — | 0.2 | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 4 | 1 | 1 | 2 |
| Days with high ≥ 32°C (days) | — | — | 0.6 | 6 | 21 | 27 |
| Days with low ≤ 0°C (days) | 2 | 0.5 | 0.1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 9 | 3 | 3 | 2 | 4 |
| Days with high ≥ 32°C (days) | 28 | 27 | 23 | 11 | 0.2 | — |
| Days with low ≤ 0°C (days) | — | — | — | — | 0.2 | 2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 39 | 43 | 37 | 27 | 25 | 23 | 55 | 52 | 33 | 26 | 31 | 38 |
| Clear days (≤ 30% cloud) | 15 | 13 | 16 | 19 | 21 | 21 | 7 | 8 | 17 | 21 | 18 | 14 |
| Partly cloudy days (30–70%) | 8 | 8 | 9 | 8 | 7 | 6 | 12 | 14 | 9 | 6 | 7 | 10 |
| Cloudy days (≥ 70%) | 7 | 8 | 7 | 3 | 3 | 3 | 11 | 10 | 5 | 4 | 5 | 7 |
| Relative humidity (%) | 48 | 46 | 39 | 30 | 24 | 20 | 41 | 47 | 43 | 38 | 39 | 47 |
| Wind speed (km/h) | 9.0 | 9.1 | 9.3 | 10.2 | 10.2 | 9.9 | 7.7 | 6.5 | 7.6 | 8.3 | 8.9 | 9.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 39 | 43 | 37 | 27 | 25 | 23 |
| Clear days (≤ 30% cloud) | 15 | 13 | 16 | 19 | 21 | 21 |
| Partly cloudy days (30–70%) | 8 | 8 | 9 | 8 | 7 | 6 |
| Cloudy days (≥ 70%) | 7 | 8 | 7 | 3 | 3 | 3 |
| Relative humidity (%) | 48 | 46 | 39 | 30 | 24 | 20 |
| Wind speed (km/h) | 9.0 | 9.1 | 9.3 | 10.2 | 10.2 | 9.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 52 | 33 | 26 | 31 | 38 |
| Clear days (≤ 30% cloud) | 7 | 8 | 17 | 21 | 18 | 14 |
| Partly cloudy days (30–70%) | 12 | 14 | 9 | 6 | 7 | 10 |
| Cloudy days (≥ 70%) | 11 | 10 | 5 | 4 | 5 | 7 |
| Relative humidity (%) | 41 | 47 | 43 | 38 | 39 | 47 |
| Wind speed (km/h) | 7.7 | 6.5 | 7.6 | 8.3 | 8.9 | 9.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Tucson Wfo (NOAA GHCN station USC00028815), about 3 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.