Weather in Mexico City in August

A good month. August is a solid month to be in Mexico City. You should expect rain on 28 days of the month, which is more days wet than dry.

August ranks 11 of 12 — near the bottom of Mexico City's year. December is the month that works, and the swing between the two is 33 points, which is a different holiday rather than a slightly better one. Worth keeping in perspective: August is the weakest month of Mexico City's year and it is still a perfectly good one. The downside here is small.

Rain on 28 of the month's 31 days, 3 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. 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 August reaches 30 °C. Across the twenty years measured, the hottest August day reached 27.9 °C and the coldest night fell to 8.7 °C, and the wettest single day dropped 43 mm — roughly 28% of the month's rain in one day.

August is one of the reliable ones — rainfall has stayed between 93 mm and 217 mm across all twenty years, a narrow enough band that the 153 mm average is something you can plan against rather than merely quote.

Wind is light at 3.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 79%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 23.8 °C in July, 23.6 here, 22.7 in September. Nothing about the timing within the month matters much.

Daylight in August

August is at or near the longest days of Mexico City's year: 12.8 hours of daylight, losing 0.5 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

Despite being inland, the year stays fairly even: 21.8 °C between the year's warmest afternoons and coldest nights. At 2240 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

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.

August in Mexico City versus nearby

If Mexico City is one option among several, the nearby comparison is worth making. Santiago de Querétaro is close enough to be a coin toss — 3.4 °C warmer, 6 days less rain. Morelia is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: August is a compromise. December is 33 points better and is what Mexico City 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 Mexico City

See all twelve months in Mexico City, or where else to go in August.