Weather in Monterrey in August

A hard month. August is a hard month in Monterrey, and worth planning around. Daytime highs average 36 °C and the afternoon is not negotiable — outdoor plans move to early morning or evening.

August ranks 9 of 12 in Monterrey: past the worst of the year but short of January, which is the month to book if the dates are open.

Rain on 12 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. 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 August day reached 41.9 °C and the coldest night fell to 18.5 °C, and the wettest single day dropped 37 mm — roughly 64% of the month's rain in one day.

August is moderately variable: 20 mm in the driest year against 163 mm in the wettest, around an average of 58 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 9.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 64%.

How August sits in the year

Temperatures hold steady either side: 35.9 °C in July, 36 here, 32.9 in September. Nothing about the timing within the month matters much.

Daylight in August

August is at or near the longest days of Monterrey's year: 13.1 hours of daylight, losing 0.6 hours across the 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

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.

August in Monterrey versus nearby

If Monterrey is one option among several, the nearby comparison is worth making. Laredo is the weaker option in August — within a degree on temperature, 6 days less rain. Brownsville is a better bet in August — within a degree on temperature, 4 days less rain.

So: August is a compromise. January is 55 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 August.