Weather in Monterrey in December

Prime time. If you get to pick your dates, December is the one. Highs average 27.2 °C, lows 12.1 °C, and rain falls on 3 days — nothing in the month is working against you.

December ranks 2 of 12 in Monterrey. Only January scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain falls on only 3 days, so an itinerary with no wet-weather fallback is a reasonable risk. 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: 9 days top 30 °C — hot spells arrive, but they break; the day swings 15.1 °C from low to high, which means one bag has to cover both. Across the twenty years measured, the hottest December day reached 36.2 °C and the coldest night fell to 1.1 °C.

This is the volatile part. December rainfall has ranged from 0 mm to 48 mm across the twenty years measured — a 48 mm spread around an average of 14 mm. The average is real but almost no individual December looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 7.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 57%.

How December sits in the year

Temperatures hold steady either side: 29.1 °C in November, 27.2 here, 26.3 in January. Nothing about the timing within the month matters much.

Daylight in December

December sits at the dark end of Monterrey's year — 10.5 hours of daylight against 13.7 at midsummer, holding steady all month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

With no coast nearby, the year swings a fair way — 25.7 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. Within December itself the daily swing is 15.1 °C, so mornings and afternoons need different clothes.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

December in Monterrey versus nearby

If Monterrey is one option among several, the nearby comparison is worth making. Laredo is close enough to be a coin toss — 5.6 °C cooler, 1 day more rain. Brownsville is close enough to be a coin toss — 3.8 °C cooler, 1 day more rain.

So: December is effectively as good as it gets here — 0 points behind January, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Monterrey

See all twelve months in Monterrey, or where else to go in December.