San Luis Potosí climate
San Luis Potosí (San Luis Potosí, Mexico) has a cold semi-arid climate (Köppen BSk). The average temperature over the year is 18 °C64 °F, and about 500 mm20 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
San Luis Potosí climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2068 | 541 | 1355 | 110.4 |
| Feb | 2373 | 744 | 1559 | 170.7 |
| Mar | 2679 | 847 | 1763 | 110.4 |
| Apr | 2985 | 1253 | 2069 | 60.2 |
| May | 3086 | 1457 | 2272 | 281.1 |
| Jun | 2883 | 1458 | 2170 | 833.3 |
| Jul | 2679 | 1456 | 2068 | 1094.3 |
| Aug | 2679 | 1356 | 2068 | 893.5 |
| Sep | 2576 | 1355 | 1966 | 943.7 |
| Oct | 2475 | 1151 | 1763 | 331.3 |
| Nov | 2271 | 846 | 1558 | 130.5 |
| Dec | 2169 | 642 | 1356 | 60.3 |
| Year | 3086 | 541 | 1864 | 50020 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 59% | 51% | 4.2 | 10:55 |
| Feb | 53% | 44% | 5.2 | 11:23 |
| Mar | 47% | 43% | 6.3 | 11:58 |
| Apr | 41% | 43% | 6.9 | 12:38 |
| May | 49% | 44% | 7.0 | 13:11 |
| Jun | 63% | 51% | 6.7 | 13:29 |
| Jul | 70% | 53% | 6.4 | 13:22 |
| Aug | 71% | 49% | 6.4 | 12:53 |
| Sep | 75% | 58% | 5.4 | 12:14 |
| Oct | 71% | 47% | 5.1 | 11:36 |
| Nov | 67% | 45% | 4.4 | 11:03 |
| Dec | 61% | 48% | 4.1 | 10:47 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of San Luis Potosí is like
The warmest month is May, with an average high of 30 °C86 °F and a low of 14 °C57 °F. The coldest is January, when highs average 20 °C68 °F and lows 5 °C41 °F. There is a clear seasonal cycle, with 9.3 °C16.8 °F between the average temperature of the warmest and the coolest month.
Annual precipitation is moderate at about 500 mm20 in. The wettest three-month stretch is July–September, which brings 58% of the annual total. Months with less than 20 mm0.8 in on average: November–April. The wettest month is July (109 mm4.3 in), the driest is April (6 mm0.2 in).
Relative humidity ranges from 41% in April to 75% in September. The clearest skies (lowest average cloud amount, 43%) are typical of March. Average wind speed near the ground ranges from 9 km/h (6 mph) in November to 12 km/h (7 mph) in August. Daylight lasts from about 10.8 hours in December to 13.5 hours in June.
Best time to visit San Luis Potosí
Based on these averages, the most comfortable months for sightseeing and outdoor activities are August–April and June. Average highs then reach 20 °C68 °F to 29 °C85 °F. Precipitation is 6 mm0.2 in to 94 mm3.7 in per month.
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for San Luis Potosí
- Wetter months (June–September) — highs 2576 to 28 °C83 °F, lows 1355 to 14 °C58 °F, about 94 mm3.7 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Drier months (October–May) — highs 2068 to 30 °C86 °F, lows 541 to 14 °C57 °F, about 16 mm0.6 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
How San Luis Potosí compares
The nearest larger place is León de los Aldama, about 136 km to the southwest. Compared with it, San Luis Potosí is on average 1.1 °C2.1 °F cooler. It receives 27% less precipitation (500 mm20 in vs 683 mm27 in). The difference is largest in June (1.4 °C2.5 °F cooler).
World Climates covers 96 places in Mexico. By annual mean temperature, San Luis Potosí is the 80th warmest of them. By annual precipitation, it is the 71st wettest. See all of them on the Mexico climate page.
Some places in other countries have a very similar pattern of temperature and rainfall (with seasons shifted for the other hemisphere). The closest matches are Cochabamba (Bolivia, BSk), Harare (Zimbabwe, Cwa) and Asmara (Eritrea, BSk).
The same NASA POWER grid cell also contains Soledad de Graciano Sánchez (pop. 332,072). Their long-term averages in this dataset are essentially the same as for San Luis Potosí, so they do not have separate pages.
Nearby places
- Climate in León de los Aldama 136 km · 19 °C66 °F · 683 mm27 in
- Climate in Aguascalientes 139 km · 18 °C65 °F · 546 mm22 in
- Climate in San Miguel de Allende 140 km · 18 °C64 °F · 603 mm24 in
- Climate in Irapuato 169 km · 19 °C67 °F · 722 mm28 in
- Climate in Guadalupe 172 km · 16 °C60 °F · 474 mm19 in
- Climate in Zacatecas 179 km · 14 °C58 °F · 439 mm17 in
- Climate in Santiago de Querétaro 184 km · 19 °C66 °F · 682 mm27 in
- Climate in Ciudad Valles 203 km · 25 °C77 °F · 1,026 mm40 in
Frequently asked questions
What is the warmest month in San Luis Potosí?
May is the warmest month in San Luis Potosí. Its average high is 30 °C (86 °F) and its average low is 14 °C (57 °F).
What is the coldest month in San Luis Potosí?
January is the coldest month. Its average high is 20 °C (68 °F) and its average low is 5 °C (41 °F).
When does it rain the most in San Luis Potosí?
July is the wettest month with about 109 mm (4.3 in) of precipitation. April is the driest with about 6 mm (0.2 in).
What is the best time to visit San Luis Potosí?
Judging by long-term averages, the most comfortable months are August–April and June.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 2,151 m, while San Luis Potosí lies at about 1,886 m. Temperatures on this page were therefore adjusted by +1.7 °C3.1 °F using the standard lapse rate of 6.5 °C per 1,000 m.