Monterrey Temperature by Month

Monterrey in Nuevo León, Mexico sees significant seasonal temperature differences, with daytime highs between 20°C (68°F) in January and 33°C (91°F) in August, averaging 27°C (81°F) annually. Explore the full monthly breakdown below.

Visitors to Monterrey can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 21°C (70°F) in August to 8°C (46°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Monterrey by month:

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. August, the city's warmest month, averages 243 hours of sunshine.

The chart below shows the average temperature throughout the year:

Monterrey's average annual maximum temperature is 27°C (81°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Monterrey, January is the coolest month, with average highs of 20°C (68°F) and humidity around 67%, considered high. In August, the warmest month, temperatures average 33°C (91°F) with 64% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

For more on Monterrey's weather, including monthly rainfall, sunshine hours, and humidity, visit our Monterrey climate page.