Weather in Monterrey in July

A hard month. July is a hard month in Monterrey, and worth planning around. Daytime highs average 35.9 °C and the afternoon is not negotiable — outdoor plans move to early morning or evening.

July ranks 12 of 12 — near the bottom of Monterrey's year. January is the month that works, and the swing between the two is 59 points, which is a different holiday rather than a slightly better one.

This is persistent light rain rather than storms: 14 wet days but only 2 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. Pack for heat management rather than style: shade, water, and a schedule that gives up on the middle of the day.

What the averages hide

Averages flatten a month, and this one hides a few things: 21 days of the month clear 35 °C — that is not a heatwave, it is the month. Across the twenty years measured, the hottest July day reached 42.3 °C and the coldest night fell to 19.2 °C, and the wettest single day dropped 142 mm — roughly 165% of the month's rain in one day.

July is moderately variable: 22 mm in the driest year against 289 mm in the wettest, around an average of 86 mm. Roughly two Julys in three land near that average, and the third does something else entirely.

Wind is light at 9.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 64%.

How July sits in the year

Temperatures hold steady either side: 37 °C in June, 35.9 here, 36 in August. Nothing about the timing within the month matters much.

Daylight in July

July is at or near the longest days of Monterrey's year: 13.6 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

With no coast nearby, the year swings a fair way — 25.7 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

July in Monterrey versus nearby

If Monterrey is one option among several, the nearby comparison is worth making. Laredo is close enough to be a coin toss — within a degree on temperature, 6 days less rain. Brownsville is a better bet in July — 2.1 °C cooler, 6 days less rain.

So: July is a compromise. January is 59 points better and is what Monterrey 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 Monterrey

See all twelve months in Monterrey, or where else to go in July.