Weather in Mérida in July

A hard month. July asks something of you. Go in knowing what. You should expect rain on 23 days of the month, which is more days wet than dry.

July ranks 10 of 12 — near the bottom of Mérida's year. January is the month that works, and the swing between the two is 41 points, which is a different holiday rather than a slightly better one.

Rain on 23 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. Pack for 32.3 °C days and 24 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 5 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest July day reached 38.3 °C and the coldest night fell to 22.2 °C, and the wettest single day dropped 35 mm — roughly 27% 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 197 mm against 56 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 128 mm average is a reasonable planning figure, not a promise.

Wind is light at 0.8 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 July sits in the year

Temperatures hold steady either side: 33 °C in June, 32.3 here, 32.3 in August. Nothing about the timing within the month matters much.

Daylight in July

July is at or near the longest days of Mérida's year: 13.3 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 28.5 °C in July — warm enough that the water offers no relief from the heat. This is the warmest the water gets all year.

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 Mérida versus nearby

If Mérida is one option among several, the nearby comparison is worth making. Cancún is a better bet in July — 2.2 °C cooler, 5 days less rain. Key West is a better bet in July — 2.8 °C cooler, 1 day more rain.

So: July is a compromise. January is 38 points better and is what Mérida 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 Mérida

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