San Luis Potosí weather in January

Name: San Luis Potosí
Address: MX

In January, San Luis Potosí has daytime highs averaging 21 °C, nights around 6.7 °C, with 2.8 wet days. Figures are 1991–2020 climate normals.

20.9°C Average high
6.7°C Average low
2.8days Wet days
16mm Rainfall
11h Daylight

Daily temperatures through January

Daily highDaily low Day of month on the horizontal axis. Highs peak at 22.5 °C and lows bottom out at 5.7 °C.

How January develops

Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.

Days	Avg high	Avg low	Chance of rain
1–10 January	20.6 °C	6.7 °C	9 %
11–20 January	20.4 °C	6.3 °C	8 %
21–31 January	21.7 °C	7.2 °C	10 %

Average highs rise from 20.6 °C early in January to 21.7 °C by the end of it.

Chance of a wet day (over 1 mm) by date in January. Wettest date over the 30 years: January 25, at 23 %. Single dates are noisy — read the shape, not the spikes.

What to expect

Measure	Typical January	Share of the month
Days above 25 °C	2.6 of 31	8 %
Days above 30 °C	0 of 31	0 %
Days below 0 °C	0.2 of 31	1 %
Days with more than 1 mm rain	2.8 of 31	9 %

Conditions in January

Measure	Average
Mean temperature	13 °C
Record high (1991–2020)	28 °C
Record low (1991–2020)	-3.5 °C
Relative humidity	59 %
Wind speed	18 km/h
Cloud cover	49 %

January compared with the months around it

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 %
November	21.9 °C	17 mm	49 %
December	21.4 °C	10 mm	49 %

See all twelve months for San Luis Potosí

January is the 12th warmest month here.
It is the 4th driest month of the year.
It ranks 7th for least cloud cover.
Days last about 11 hours from sunrise to sunset.
It rains on 2.8 of 31 days — 9 % of the month.
Nights are about 14 °C cooler than the middle of the day.
The hottest January day on record since 1991 reached 28 °C, 7.2 °C above the usual daytime high.

Nearby destinations in January

Destination	Avg high	Wet days
San Luis Potosí	21 °C	2.8
León de los Aldama	22 °C	2
Aguascalientes	21 °C	2
San Miguel de Allende	22 °C	2
Irapuato	24 °C	2
Guadalupe	19 °C	3
Salamanca	24 °C	2
Celaya	23 °C	2
Santiago de Querétaro	23 °C	2

QuestionsJanuary in San Luis Potosí, answered

How warm is San Luis Potosí in January?

Daily highs average 21 °C and nights fall to about 6.7 °C, a spread of 14 °C between afternoon and dawn. That makes January the 12th warmest month of the year here.

Does it rain much in San Luis Potosí in January?

January averages 16 mm of rain, spread over about 3 of the 31 days — 9 % of the month. Cloud cover averages 49 % of the sky.

How long are the days in January?

San Luis Potosí averages 11 hours between sunrise and sunset in January. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.

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
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. 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.