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San Luis, Arizona climate
BWh Hot desert
San Luis has a seasonal warm-temperate climate (Hot desert, Köppen BWh). The hottest month is August with an average daily high near 42°C, while the coldest is December averaging around 6°C at night. Precipitation totals about 60 mm a year and is strongly seasonal — December alone averages 13 mm while June barely receives 0 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)San Luis climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 23 | 27 | 31 | 36 | 40 | 42 | 42 | 39 | 33 | 26 | 20 |
| Avg temp (°C) | 14 | 15 | 19 | 22 | 26 | 31 | 34 | 34 | 31 | 25 | 18 | 13 |
| Avg low (°C) | 7 | 8 | 10 | 13 | 17 | 21 | 25 | 26 | 22 | 16 | 10 | 6 |
| Precipitation (mm) | 7 | 7 | 7 | 2 | 1 | 0 | 4 | 5 | 5 | 4 | 5 | 13 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 23 | 27 | 31 | 36 | 40 |
| Avg temp (°C) | 14 | 15 | 19 | 22 | 26 | 31 |
| Avg low (°C) | 7 | 8 | 10 | 13 | 17 | 21 |
| Precipitation (mm) | 7 | 7 | 7 | 2 | 1 | 0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 42 | 42 | 39 | 33 | 26 | 20 |
| Avg temp (°C) | 34 | 34 | 31 | 25 | 18 | 13 |
| Avg low (°C) | 25 | 26 | 22 | 16 | 10 | 6 |
| Precipitation (mm) | 4 | 5 | 5 | 4 | 5 | 13 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 43 | 38 | 32 | 28 | 25 | 35 | 34 | 29 | 30 | 35 | 40 |
| Relative humidity (%) | 47 | 46 | 41 | 34 | 30 | 26 | 30 | 33 | 32 | 32 | 36 | 45 |
| Wind speed (km/h) | 6.5 | 6.4 | 6.6 | 7.5 | 7.5 | 7.4 | 8.2 | 8.0 | 6.7 | 6.5 | 6.4 | 6.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 43 | 38 | 32 | 28 | 25 |
| Relative humidity (%) | 47 | 46 | 41 | 34 | 30 | 26 |
| Wind speed (km/h) | 6.5 | 6.4 | 6.6 | 7.5 | 7.5 | 7.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 35 | 34 | 29 | 30 | 35 | 40 |
| Relative humidity (%) | 30 | 33 | 32 | 32 | 36 | 45 |
| Wind speed (km/h) | 8.2 | 8.0 | 6.7 | 6.5 | 6.4 | 6.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from CONAGUA / SMN, Mexico's national weather service, measured at Presa Morelos, about 26 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.