Weather in San Luis Potosí in July

A good month. July works. It is not the peak, but nothing about it fights you. You should expect rain on 17 days of the month, which is more days wet than dry.

July ranks 11 of 12 — near the bottom of San Luis Potosí's year. December is the month that works, and the swing between the two is 32 points, which is a different holiday rather than a slightly better one. Worth keeping in perspective: July is the weakest month of San Luis Potosí's year and it is still a perfectly good one. The downside here is small.

Rain on 17 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest July day reached 31.9 °C and the coldest night fell to 10.6 °C, and the wettest single day dropped 27 mm — roughly 25% of the month's rain in one day.

July is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest July on record still delivered 193 mm against 30 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 109 mm average is a reasonable planning figure, not a promise.

Wind is light at 11.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 70%.

How July sits in the year

Temperatures hold steady either side: 28.7 °C in June, 27 here, 27.1 in August. Nothing about the timing within the month matters much.

Daylight in July

July is at or near the longest days of San Luis Potosí's year: 13.4 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

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.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

July 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 — within a degree on temperature, 8 days more rain. Morelia is close enough to be a coin toss — 2.7 °C cooler, 11 days more rain.

So: July is a compromise. December is 29 points better and is what San Luis Potosí is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in San Luis Potosí

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