Weather in San Luis Potosí in January

Prime time. January is about as good as San Luis Potosí gets. Highs average 21.3 °C, lows 6.1 °C, and rain falls on 2 days — nothing in the month is working against you.

January ranks 2 of 12 in San Luis Potosí. Only December scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain falls on only 2 days, so an itinerary with no wet-weather fallback is a reasonable risk. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average January reaches 30 °C; the day swings 15.2 °C from low to high, which means one bag has to cover both. Across the twenty years measured, the hottest January day reached 27.6 °C and the coldest night fell to -2.2 °C, and the wettest single day dropped 25 mm — roughly 227% of the month's rain in one day.

This is the volatile part. January rainfall has ranged from 0 mm to 36 mm across the twenty years measured — a 36 mm spread around an average of 11 mm. The average is real but almost no individual January looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 10.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 59%.

How January sits in the year

Temperatures hold steady either side: 21.8 °C in December, 21.3 here, 23.9 in February. Nothing about the timing within the month matters much.

Daylight in January

January sits at the dark end of San Luis Potosí's year — 10.9 hours of daylight against 13.5 at midsummer, holding steady all month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

Despite being inland, the year stays fairly even: 24.5 °C between the year's warmest afternoons and coldest nights. At 1886 m, altitude is doing as much work here as latitude: thinner air means fierce sun by day and heat that leaves the moment it sets. Within January itself the daily swing is 15.2 °C, so mornings and afternoons need different clothes.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, April is the trade worth considering — 14 points weaker on weather, and materially quieter.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

January in San Luis Potosí versus nearby

If San Luis Potosí is one option among several, the nearby comparison is worth making. Santiago de Querétaro is close enough to be a coin toss — 2.2 °C warmer, the same number of rain days. Morelia is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: January is effectively as good as it gets here — 1 points behind December, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in San Luis Potosí

See all twelve months in San Luis Potosí, or where else to go in January.