San Luis Potosí climate
San Luis Potosí is warmest in May, with average highs of 29 °C, and coldest in January, when nights average 6.7 °C. September is the wettest month (85 mm) and December the driest (10 mm). Figures are 1991–2020 climate normals.
Across a full year San Luis Potosí averages 487 mm of rain, 163 days above 25 °C and 1 days below freezing.
Mexico · population 722,772 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month May 29 °C
- Coldest month January 6.7 °C
- Driest month December 10 mm
- Wettest month September 85 mm
- Least cloud March 43 % cloud
- Hottest on record May 37 °C
- Coldest on record December -5.1 °C
What to expectSan Luis Potosí through the year
San Luis Potosí has a clear annual cycle: average daily highs run from 21 °C in January to 29 °C in May, a swing of 8.1 °C in mean temperature across the year.
Counted across a normal year, 163 days a year reach 25 °C, 30 of them reach 30 °C, 1 nights drop below freezing. The warmest reading in the 1991–2020 record is 37 °C, in May.
Rain is strongly seasonal. September averages 85 mm against 10 mm in December — 8.2 times as much. Planning around the dry months matters more here than planning around temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 20.9 °C | 16 mm | 49 % |
| February | 23.6 °C | 14 mm | 44 % |
| March | 26.1 °C | 14 mm | 43 % |
| April | 28.4 °C | 22 mm | 48 % |
| May | 28.6 °C | 47 mm | 47 % |
| June | 26.5 °C | 72 mm | 57 % |
| July | 24.9 °C | 83 mm | 65 % |
| August | 25.3 °C | 64 mm | 62 % |
| September | 23.4 °C | 85 mm | 71 % |
| October | 23.0 °C | 44 mm | 57 % |
| November | 21.9 °C | 17 mm | 49 % |
| December | 21.4 °C | 10 mm | 49 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | 20.9 °C | 6.7 °C | 12.8 °C | 28.1 °C | -3.5 °C | 3 | 0 | 0 |
| February | 23.6 °C | 8.2 °C | 14.9 °C | 31.8 °C | -0.8 °C | 12 | 0 | 0 |
| March | 26.1 °C | 10.1 °C | 17.3 °C | 33.4 °C | -0.6 °C | 21 | 3 | 0 |
| April | 28.4 °C | 12.7 °C | 19.9 °C | 34.6 °C | 4.9 °C | 25 | 11 | 0 |
| May | 28.6 °C | 14.7 °C | 21.0 °C | 36.7 °C | 6.5 °C | 26 | 12 | 0 |
| June | 26.5 °C | 15.5 °C | 20.2 °C | 34.5 °C | 9.6 °C | 20 | 4 | 0 |
| July | 24.9 °C | 15.0 °C | 19.1 °C | 31.5 °C | 10.4 °C | 15 | 0 | 0 |
| August | 25.3 °C | 15.1 °C | 19.3 °C | 31.4 °C | 11.6 °C | 17 | 0 | 0 |
| September | 23.4 °C | 14.6 °C | 18.2 °C | 30.0 °C | 7.7 °C | 8 | 0 | 0 |
| October | 23.0 °C | 12.3 °C | 16.9 °C | 30.1 °C | 2.4 °C | 8 | 0 | 0 |
| November | 21.9 °C | 9.5 °C | 14.8 °C | 29.5 °C | -1.0 °C | 6 | 0 | 0 |
| December | 21.4 °C | 7.6 °C | 13.6 °C | 27.6 °C | -5.1 °C | 3 | 0 | 1 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 16 mm | 3 | 11 h/day | 49 % | 59 % | 18 km/h |
| February | 14 mm | 2 | 11 h/day | 44 % | 54 % | 20 km/h |
| March | 14 mm | 3 | 12 h/day | 43 % | 49 % | 22 km/h |
| April | 22 mm | 5 | 13 h/day | 48 % | 48 % | 22 km/h |
| May | 47 mm | 9 | 13 h/day | 47 % | 58 % | 20 km/h |
| June | 72 mm | 11 | 13 h/day | 57 % | 69 % | 20 km/h |
| July | 83 mm | 10 | 13 h/day | 65 % | 73 % | 21 km/h |
| August | 64 mm | 9 | 13 h/day | 62 % | 72 % | 21 km/h |
| September | 85 mm | 12 | 12 h/day | 71 % | 78 % | 18 km/h |
| October | 44 mm | 7 | 12 h/day | 57 % | 73 % | 17 km/h |
| November | 17 mm | 3 | 11 h/day | 49 % | 67 % | 16 km/h |
| December | 10 mm | 2 | 11 h/day | 49 % | 61 % | 17 km/h |
How San Luis Potosí compares
The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.
| Destination | Summer high | Winter low | Rain per year | Days above 25 °C |
|---|---|---|---|---|
| San Luis Potosí | 29 °C | 6.7 °C | 487 mm | 163 |
| León de los Aldama · Mexico | 30 °C | 8.3 °C | 568 mm | 199 |
| Aguascalientes · Mexico | 30 °C | 7.1 °C | 493 mm | 188 |
| San Miguel de Allende · Mexico | 29 °C | 8.2 °C | 571 mm | 174 |
| Irapuato · Mexico | 31 °C | 8.6 °C | 646 mm | 256 |
| Guadalupe · Mexico | 27 °C | 4.9 °C | 552 mm | 91 |
| Salamanca · Mexico | 32 °C | 8.8 °C | 685 mm | 264 |
Where San Luis Potosí ranks
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in North America year-round | 18th of 50 | 86/100 |
| The driest places in North America in November | 33rd of 50 | 17 mm |
| Places with the best weather in North America in July | 37th of 50 | 83/100 |
| The driest places in North America in December | 38th of 50 | 10 mm |
| Places with the best weather in North America in February | 42nd of 50 | 91/100 |
| Places with the best weather in North America in December | 43rd of 50 | 92/100 |
Planning a trip? See the best time to visit San Luis Potosí.
QuestionsCommon questions about San Luis Potosí’s climate
When is the best time to visit San Luis Potosí?
That depends on what you want, so the honest answer is a comparison rather than a single month. April, June, August sit closest to 20 °C on average, May is the warmest month and December the driest. The month-by-month table above has the full picture.
How hot does San Luis Potosí get?
In May, the warmest month, daily highs average 29 °C. About 30 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.
How cold does it get in winter?
Nights average 6.7 °C in January, the coldest month. A normal year has 1 nights below freezing.
Which month is wettest in San Luis Potosí?
September, averaging 85 mm over 12 days with rain. The driest month is December with 10 mm. The year as a whole averages 487 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in San Luis Potosí rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Data point
- 22.152°, -100.971° (the coordinates the reanalysis values are taken for)
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.