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San Luis Potosí, San Luis Potosí climate
BSk Cold semi-arid
San Luis Potosí has a mildly seasonal mild-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is May with an average daily high near 87°F, while the coldest is January averaging around 39°F at night. Precipitation totals about 15 inches a year and is strongly seasonal — September alone averages 2.9 inches while December barely receives 0.28 inches.
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 Potosí climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 72 | 77 | 81 | 86 | 87 | 84 | 82 | 82 | 79 | 77 | 75 | 73 |
| Avg temp (°F) | 55 | 59 | 63 | 68 | 70 | 69 | 67 | 67 | 66 | 63 | 59 | 56 |
| Avg low (°F) | 39 | 42 | 45 | 49 | 53 | 55 | 53 | 53 | 53 | 49 | 44 | 40 |
| Precipitation (in) | 0.5 | 0.5 | 0.4 | 0.4 | 1.7 | 2.3 | 2.4 | 1.9 | 2.9 | 1.3 | 0.6 | 0.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 72 | 77 | 81 | 86 | 87 | 84 |
| Avg temp (°F) | 55 | 59 | 63 | 68 | 70 | 69 |
| Avg low (°F) | 39 | 42 | 45 | 49 | 53 | 55 |
| Precipitation (in) | 0.5 | 0.5 | 0.4 | 0.4 | 1.7 | 2.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 82 | 82 | 79 | 77 | 75 | 73 |
| Avg temp (°F) | 67 | 67 | 66 | 63 | 59 | 56 |
| Avg low (°F) | 53 | 53 | 53 | 49 | 44 | 40 |
| Precipitation (in) | 2.4 | 1.9 | 2.9 | 1.3 | 0.6 | 0.3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 43 | 43 | 45 | 45 | 53 | 55 | 53 | 59 | 48 | 43 | 47 |
| Relative humidity (%) | 58 | 53 | 46 | 41 | 48 | 63 | 70 | 72 | 75 | 71 | 67 | 62 |
| Wind speed (mph) | 6.3 | 6.8 | 7.2 | 7.2 | 6.5 | 7.4 | 7.6 | 7.6 | 7.2 | 6.3 | 5.9 | 6.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 43 | 43 | 45 | 45 | 53 |
| Relative humidity (%) | 58 | 53 | 46 | 41 | 48 | 63 |
| Wind speed (mph) | 6.3 | 6.8 | 7.2 | 7.2 | 6.5 | 7.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 53 | 59 | 48 | 43 | 47 |
| Relative humidity (%) | 70 | 72 | 75 | 71 | 67 | 62 |
| Wind speed (mph) | 7.6 | 7.6 | 7.2 | 6.3 | 5.9 | 6.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from CONAGUA / SMN, Mexico's national weather service, measured at San Luis Potosi (smn), inside the city.
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.