Weather in San Luis Potosí in March

Prime time. March is about as good as San Luis Potosí gets. Highs average 26.6 °C, lows 9.1 °C, and rain falls on 2 days — nothing in the month is working against you.

March ranks 4 of 12 in San Luis Potosí: past the worst of the year but short of December, which is the month to book if the dates are open.

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: 4 days top 30 °C — hot spells arrive, but they break; the day swings 17.5 °C from low to high, which means one bag has to cover both. Across the twenty years measured, the hottest March day reached 34.5 °C and the coldest night fell to -1 °C.

This is the volatile part. March rainfall has ranged from 0 mm to 84 mm across the twenty years measured — a 84 mm spread around an average of 11 mm. The average is real but almost no individual March looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 11.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 47%.

How March sits in the year

The month is on the way up: 2.7 °C warmer than February, and April adds another 3.2 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in March

12 hours of daylight, gaining 0.6 hours across the month. That is between San Luis Potosí's extremes of 13.5 and 10.8 hours, so days are long enough not to constrain the plan.

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 March itself the daily swing is 17.5 °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.

March 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 — 2.1 °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: March 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 March.