Weather in Mérida

Rain is the monsoon runs from June to October, inside an annual total of 1046 mm. The wettest month is September at 188 mm; the driest is March at 20 mm.

Mérida is in Mexico at 21.0°N. The 2001–2020 NASA POWER daily record describes a monsoon climate with a sharp wet-dry split. May is the warmest month (average 30.1°C, high 36.0°C) and January is the coolest (average 23.9°C, low 18.6°C). On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are January, February, and March.

Rainfall pattern

The monsoon in Mérida starts in June and ends in October (June, July, August, September, and October). September is the core of it at 188 mm. March is the other extreme, with 20 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. September averages 23 such days; March averages 4.

Temperature through the year

Mérida has a 6.2°C gap between its coolest monthly average (23.9°C in January) and its warmest (30.1°C in May). That is a northern-hemisphere pattern.

Mean high across all twelve months is 31.9°C and mean low is 22.1°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

Distinctive months in Mérida

January is the coolest month, with lows around 18.6°C and highs near 29.2°C. Rainfall is 33 mm. March is the driest month, averaging only 20 mm across 4 rainy days. Highs sit near 33.6°C. May is the warmest month. Afternoon highs average 36.0°C and nights settle near 24.2°C, with 73 mm of rain. The monsoon opens in June. Expect 183 mm and 20 rainy days, with nights around 24.3°C.

July stands apart from the months beside it: 32.2°C / 24.0°C and 128 mm. September is the wettest month — 188 mm and 23 rainy days, with 85% humidity. October closes the monsoon: 127 mm over 16 rainy days, then the calendar dries. November: 29.3°C high, 20.5°C low, 52 mm rain, 77% humidity.

Best months to visit Mérida

The three months with the highest comfort score are January, February, and March: January (23.9°C average, 33 mm, 69% humidity); February (25.5°C average, 29 mm, 65% humidity); March (27.3°C average, 20 mm, 59% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the monsoon itself — fewer crowds, greener landscape, heavier rain — aim at June–October instead of the score.

How Mérida compares inside Mexico

Cancún is about 289 km away: Mérida is 1.5°C warmer than Cancún in its hottest month and 204 mm drier over the year than Cancún. Cancún’s wettest month is October (224 mm) versus September here.

Puebla is about 922 km away: Mérida is 9.3°C warmer than Puebla in its hottest month and 168 mm wetter over the year than Puebla. Puebla’s wettest month is September (169 mm) versus September here.

Iztapalapa is about 1001 km away: Mérida is 12.4°C warmer than Iztapalapa in its hottest month and 150 mm wetter over the year than Iztapalapa. Iztapalapa’s wettest month is September (171 mm) versus September here.