Weather in Hermosillo in December

Prime time. If you get to pick your dates, December is the one. Highs average 23.9 °C, lows 9.6 °C, and rain falls on 1 days — nothing in the month is working against you.

December is the highest-scoring month of the twelve. The nearest rival is February, and the month at the other end of the year is July.

Rain falls on only 1 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

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest December day reached 33.7 °C and the coldest night fell to 0.9 °C.

This is the volatile part. December rainfall has ranged from 0 mm to 41 mm across the twenty years measured — a 41 mm spread around an average of 12 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 8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 45%.

How December sits in the year

Temperatures hold steady either side: 28.6 °C in November, 23.9 here, 24.6 in January. Nothing about the timing within the month matters much.

Daylight in December

December sits at the dark end of Hermosillo's year — 10.3 hours of daylight against 14 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 — 30.1 °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 14.2 °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 Hermosillo versus nearby

If Hermosillo is one option among several, the nearby comparison is worth making. Tucson is the weaker option in December — 5 °C cooler, 4 days more rain. Chihuahua is close enough to be a coin toss — 4.2 °C cooler, the same number of rain days.

So: December is the answer for Hermosillo. If it is booked out or priced out, February is the next best thing at 1 points behind, and July is the month to keep off the shortlist.

Every month in Hermosillo

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