San Luis Potosí City climate — normals and trends
San Luis Potosí City (Mexico) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 16.6 °C and it receives 442 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is May (20.2 °C on average) and the coldest is January (12.0 °C). Rainfall peaks in September.
San Luis Potosí City averages 2 frost days, 20 hot days (≥ 30 °C) and 78 rainy days per year.
San Luis Potosí City has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 3 to 1 per year over the period.
The hottest day of the period reached 36.6 °C (on 8 May 1998) and the coldest -5.3 °C (on 3 February 1951).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
San Luis Potosí CitySan Luis Potosí
- coords
- 22.15°, -100.97°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.6°C
Average daily high
23.7°C
Average daily low
10.9°C
Annual rainfall
442mm
Sunshine / day
10.6h
Mean relative humidity
62%
Average peak wind
19.0km/h
Seasonal range
8.2°C
Frost days (< 0 °C)
2 d/yr
Hot days (≥ 30 °C)
20 d/yr
Rainy days (≥ 1 mm)
78 d/yr
Annual snowfall
0.4 cm
Average feels-like high
22.0 °C
Average feels-like low
9.5 °C
Average peak gust
39.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
21.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.66 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
36.6 °C
8 May 1998
Coldest day
-5.3 °C
3 February 1951
Wettest day
78 mm
13 October 1997
Windiest day
54.2 km/h
4 March 1983
Strongest gust
105.5 km/h
4 March 1983
Hottest feels-like
36.6 °C
25 May 2024
Coldest feels-like
-9.4 °C
14 December 1997
Snowiest day
15.5 cm
11 January 1967
Sunniest day
13.1 h
29 June 1950
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 21.2 °C | +1.6 °C | 8 mm | -9 mm |
| Feb | 25.2 °C | +3.2 °C | 4 mm | -9 mm |
| Mar | 27.9 °C | +2.9 °C | 1 mm | -12 mm |
| Apr | 28.8 °C | +1.7 °C | 3 mm | -22 mm |
| May | 30.5 °C | +2.8 °C | 52 mm | +5 mm |
| Jun | 24.2 °C | -1.8 °C | 131 mm | +62 mm |
| Jul | 24.3 °C | -0.3 °C | 118 mm | +52 mm |
| Aug | 27.2 °C | +2.2 °C | 44 mm | -12 mm |
| Sep | 25.6 °C | +2.1 °C | 99 mm | +26 mm |
| Oct | 24.5 °C | +2.0 °C | 35 mm | -2 mm |
| Nov | 24.4 °C | +2.9 °C | 3 mm | -12 mm |
| Dec | 22.0 °C | +2.0 °C | 7 mm | -5 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of San Luis Potosí City?
San Luis Potosí City has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 16.6 °C and it receives 442 mm of precipitation per year.
What is the hottest day ever recorded in San Luis Potosí City?
The hottest day measured in San Luis Potosí City between 1940 and 2025 was 8 May 1998, reaching 36.6 °C.
What is the coldest day in San Luis Potosí City?
The coldest day measured in San Luis Potosí City between 1940 and 2025 was 3 February 1951, at -5.3 °C.
Does it snow in San Luis Potosí City?
Almost never: San Luis Potosí City sees virtually no snow, with about 2 frost days per year.
Has the climate of San Luis Potosí City warmed?
Yes: San Luis Potosí City warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Luis Potosí City?
The wettest day measured in San Luis Potosí City between 1940 and 2025 was 13 October 1997, with 78 mm of rain in 24 hours.
What was the windiest day in San Luis Potosí City?
The windiest day measured in San Luis Potosí City between 1940 and 2025 was 4 March 1983, with winds reaching 54.2 km/h.
What is the warmest month in San Luis Potosí City?
The warmest month in San Luis Potosí City is May (20.2 °C on average); the coldest is January (12.0 °C).
How much does it rain in San Luis Potosí City?
San Luis Potosí City receives on average 442 mm of precipitation per year, spread over about 78 rainy days.
Is it sunny in San Luis Potosí City?
San Luis Potosí City gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
What is the biggest single-day snowfall in San Luis Potosí City?
The heaviest 24-hour snowfall measured in San Luis Potosí City between 1940 and 2025 was 11 January 1967, with 15.5 cm.
Are there tropical nights in San Luis Potosí City?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in San Luis Potosí City.
What was the most extreme apparent temperature in San Luis Potosí City?
In San Luis Potosí City, between 1940 and 2025, the highest apparent temperature reached 36.6 °C on 25 May 2024, and the lowest was -9.4 °C on 14 December 1997.
Compare San Luis Potosí City with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Luis Potosí City