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San Luis Potosí, San Luis Potosí Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in San Luis Potosí, San Luis Potosí?
San Luis Potosí, San Luis Potosí gets 260 mm of precipitation a year over about 45 rainy days. May is the warmest month (average high 31°C) and January the coldest (average low 3°C).
Cold desert climate
San Luis Potosí, San Luis Potosí has hot summers and warm winters. Daytime highs range from about 23°C in January to 31°C in May. June is usually the wettest month. The most comfortable time to visit is typically January to February and October to December, when daytime highs sit near 25°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 3° | 24° |
| Spring | Mar–May | 8° | 30° |
| Summer | Jun–Aug | 12° | 29° |
| Autumn | Sep–Nov | 8° | 26° |
How much rain does San Luis Potosí get?
San Luis Potosí gets 260 mm of precipitation in an average year, spread over about 45 days with measurable rain. That is fewer rainy days than 72% of Mexico.
June is the wettest month, with 48 mm. March is the driest, with 3 mm. September has the most rainy days, about 8.
The longest dry spell in the last five years lasted 70 days, to May 10, 2025.
From October 2025 to September 2026 San Luis Potosí got 932 mm of rain, against a normal of 260 mm for those months. June 2026 had the most, with 389 mm.
San Luis Potosí weather by month
San Luis Potosí weather in January
In January, San Luis Potosí averages a high of 23°C and a low of 3°C. It gets 8 mm of precipitation over about 2 rainy days. Estimated sunshine is 51% of daylight hours, derived from ERA5 cloud cover. The January record high is 30°C (2017) and the record low is -5°C (1996). January is one of the most comfortable months to visit.
San Luis Potosí weather in February
In February, San Luis Potosí averages a high of 26°C and a low of 4°C. It gets 4 mm of precipitation over about 2 rainy days. Estimated sunshine is 65% of daylight hours, derived from ERA5 cloud cover. The February record high is 36°C (2019) and the record low is -4°C (1996). February is one of the most comfortable months to visit.
San Luis Potosí weather in March
In March, San Luis Potosí averages a high of 28°C and a low of 6°C. It gets 3 mm of precipitation over about 1 rainy days. Estimated sunshine is 63% of daylight hours, derived from ERA5 cloud cover. The March record high is 35°C (2024) and the record low is -5°C (1996).
San Luis Potosí weather in April
In April, San Luis Potosí averages a high of 31°C and a low of 9°C. It gets 8 mm of precipitation over about 2 rainy days. Estimated sunshine is 55% of daylight hours, derived from ERA5 cloud cover. The April record high is 36°C (2023) and the record low is 0°C (1996).
San Luis Potosí weather in May
In May, San Luis Potosí averages a high of 31°C and a low of 11°C. It gets 33 mm of precipitation over about 5 rainy days. Estimated sunshine is 60% of daylight hours, derived from ERA5 cloud cover. The May record high is 39°C (2024) and the record low is 4°C (2011).
San Luis Potosí weather in June
In June, San Luis Potosí averages a high of 29°C and a low of 12°C. It gets 48 mm of precipitation over about 6 rainy days. Estimated sunshine is 47% of daylight hours, derived from ERA5 cloud cover. The June record high is 39°C (2024) and the record low is 6°C (1984).
San Luis Potosí weather in July
In July, San Luis Potosí averages a high of 28°C and a low of 11°C. It gets 41 mm of precipitation over about 6 rainy days. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. The July record high is 34°C (1998) and the record low is 6°C (2013).
San Luis Potosí weather in August
In August, San Luis Potosí averages a high of 28°C and a low of 11°C. It gets 26 mm of precipitation over about 5 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The August record high is 36°C (2023) and the record low is 4°C (2013).
San Luis Potosí weather in September
In September, San Luis Potosí averages a high of 27°C and a low of 11°C. It gets 47 mm of precipitation over about 8 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The September record high is 33°C (2023) and the record low is 3°C (2000).
San Luis Potosí weather in October
In October, San Luis Potosí averages a high of 26°C and a low of 8°C. It gets 31 mm of precipitation over about 5 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The October record high is 33°C (2009) and the record low is -3°C (2013). October is one of the most comfortable months to visit.
San Luis Potosí weather in November
In November, San Luis Potosí averages a high of 25°C and a low of 5°C. It gets 5 mm of precipitation over about 2 rainy days. Estimated sunshine is 61% of daylight hours, derived from ERA5 cloud cover. The November record high is 32°C (2023) and the record low is -6°C (2011). November is one of the most comfortable months to visit.
San Luis Potosí weather in December
In December, San Luis Potosí averages a high of 24°C and a low of 3°C. It gets 6 mm of precipitation over about 1 rainy days. Estimated sunshine is 56% of daylight hours, derived from ERA5 cloud cover. The December record high is 30°C (2011) and the record low is -7°C (2003). December is one of the most comfortable months to visit.
Sunshine, humidity and wind in San Luis Potosí
February is the sunniest month in San Luis Potosí, with estimated sunshine of 65% of daylight hours from ERA5 cloud cover. July is the cloudiest, at 35%. The annual cloud-cover estimate is 51% of daylight hours; it is not a measurement of sunshine duration. San Luis Potosí is cloudier than 51% of Mexico.
Humidity peaks in September at 67% and is lowest in March at 36%.
San Luis Potosí has about 16 days a year above 32°C. San Luis Potosí is cooler than 87% of Mexico.
First and last freeze in San Luis Potosí
The first fall freeze in San Luis Potosí typically comes around November 22, and the last spring freeze around February 20. That leaves a frost-free growing season of about 275 days.
San Luis Potosí weather records
These records cover PONCIANO ARRIAGA INTL during 1973–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the San Luis Potosí station is 39°C, on May 25, 2024. The coldest is -7°C, on December 19, 2003.
The wettest day in the available station history brought 205 mm of precipitation, on June 9, 2004.
29 all-time records have been set at the station since 1973.
The best time to visit San Luis Potosí
The most comfortable time to visit is typically January to February and October to December, when daytime highs sit near 25°C.
Winter (December–February) is warm, with average highs around 24°C and lows near 4°C.
Spring (March–May) is hot, with average highs around 30°C and lows near 9°C.
Summer (June–August) is hot, with average highs around 29°C and lows near 11°C.
Autumn (September–November) is warm, with average highs around 26°C and lows near 8°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 3° | 23° | 8.1 mm | 2 | 48% | 51% | 30° | -5° |
| February | 4° | 26° | 4.1 mm | 2 | 44% | 65% | 36° | -4° |
| March | 6° | 28° | 3.3 mm | 1 | 36% | 63% | 35° | -5° |
| April | 9° | 31° | 7.6 mm | 2 | 37% | 55% | 36° | 0° |
| May | 11° | 31° | 33 mm | 5 | 41% | 60% | 39° | 4° |
| June | 12° | 29° | 48 mm | 6 | 56% | 47% | 39° | 6° |
| July | 11° | 28° | 41 mm | 6 | 64% | 35% | 34° | 6° |
| August | 11° | 28° | 26 mm | 5 | 63% | 38% | 36° | 4° |
| September | 11° | 27° | 47 mm | 8 | 67% | 39% | 33° | 3° |
| October | 8° | 26° | 31 mm | 5 | 62% | 44% | 33° | -3° |
| November | 5° | 25° | 5.1 mm | 2 | 59% | 61% | 32° | -6° |
| December | 3° | 24° | 5.6 mm | 1 | 56% | 56% | 30° | -7° |
Station: PONCIANO ARRIAGA INTL, 12 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1973–2025; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
San Luis Potosí climate questions
How much rain does San Luis Potosí get?
San Luis Potosí gets 260 mm of precipitation in an average year, over about 45 rainy days.
What is the wettest month in San Luis Potosí?
June is the wettest month in San Luis Potosí, with 48 mm. March is the driest, with 3 mm.
How many rainy days does San Luis Potosí have a year?
San Luis Potosí has about 45 days with measurable rain in an average year. September has the most, about 8.
What is the hottest month in San Luis Potosí?
May is the warmest month in San Luis Potosí, with an average high of 31°C.
What is the coldest month in San Luis Potosí?
January is the coldest month in San Luis Potosí, with an average low of 3°C.
What is the record high temperature in San Luis Potosí?
Within the available 1973–2025 station history, the record high at the San Luis Potosí station is 39°C, set on May 25, 2024. The record low is -7°C, on December 19, 2003.
What is the sunniest month in San Luis Potosí?
February is the sunniest month in San Luis Potosí, with estimated sunshine of 65% of daylight hours from ERA5 cloud cover. July is the cloudiest.
When is the first frost in San Luis Potosí?
The first fall freeze in San Luis Potosí typically comes around November 22. The last spring freeze is around February 20.
What is the best time to visit San Luis Potosí?
The most comfortable time to visit is typically January to February and October to December, when daytime highs sit near 25°C.