Weather in Mexico City

Mexico City is in Mexico at 19.4°N. The 2001–2020 NASA POWER daily record describes a mild oceanic climate. May is the warmest month (average 17.9°C, high 25.8°C) and January is the coolest (average 11.6°C, low 4.1°C).

Rain is wet season runs from June to September, inside an annual total of 793 mm. The wettest month is July at 154 mm; the driest is December at 6 mm. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are March, April, and December.

Rain through the year

The wet season in Mexico City starts in June and ends in September (June, July, August, and September). July is the core of it at 154 mm. December is the other extreme, with 6 mm.

Humidity peaks near 82%. That usually lines up with the wetter months rather than the hottest ones.

Temperature through the year

The heat peaks in May, when the typical afternoon is 25.8°C. The opposite pole is January, when mornings average 4.1°C.

Across the year the mean afternoon high is 21.7°C. If you want the smallest day–night shock, look at months where the high and low sit close together; May nights still hold 10.1°C.

Distinctive months in Mexico City

The year bottoms out in January. Plan for 4.1°C at night and 19.1°C in the afternoon. Peak heat arrives in May: 25.8°C by day, 10.1°C at night, and 55% humidity. June is when the wet season typically starts in Mexico City: highs near 23.3°C, and rainfall jumps to 135 mm (23 rainy days).

July is the wettest month — 154 mm and 28 rainy days, with 77% humidity. October brings 64 mm and 15 rainy days; temperatures run from 7.8°C to 20.0°C. December is the driest month, averaging only 6 mm across 1 rainy days. Highs sit near 19.3°C.

When the score favours a visit

The three months with the highest comfort score are March, April, and December: March (15.0°C average, 15 mm, 50% humidity); April (17.2°C average, 22 mm, 48% humidity); December (12.0°C average, 6 mm, 64% 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 wet season itself — fewer crowds, greener landscape, heavier rain — aim at June–September instead of the score.

Mexico City and other cities in Mexico

Iztapalapa is about 11 km away: Mexico City is about as warm as Iztapalapa at the hot peak and 103 mm drier over the year than Iztapalapa. Iztapalapa’s wettest month is September (171 mm) versus July here.

Puebla is about 105 km away: Mexico City is 2.9°C cooler than Puebla in its hottest month and 85 mm drier over the year than Puebla. Puebla’s wettest month is September (169 mm) versus July here.

Querétaro is about 184 km away: Mexico City is 4.2°C cooler than Querétaro in its hottest month and 111 mm wetter over the year than Querétaro. Querétaro’s wettest month is July (158 mm) versus July here.