Weather in Hermosillo in October

A good month. October is a solid month to be in Hermosillo. Highs average 33.5 °C, lows 18.8 °C, and rain falls on 2 days — nothing in the month is working against you.

October ranks 7 of 12 in Hermosillo: past the worst of the year but short of December, which is the month to book if the dates are open.

Rain falls on only 2 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 33.5 °C days and 18.8 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 11 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest October day reached 43.5 °C and the coldest night fell to 7.1 °C, and the wettest single day dropped 46 mm — roughly 329% of the month's rain in one day.

This is the volatile part. October rainfall has ranged from 0 mm to 73 mm across the twenty years measured — a 73 mm spread around an average of 14 mm. The average is real but almost no individual October looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 7.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 47%.

How October sits in the year

The month is on the way down: 2.8 °C cooler than September, with November dropping another 4.9 °C. The first week and the last are not the same trip. Rain has already shifted: 7 days fewer than September had.

Daylight in October

11.5 hours of daylight, losing 0.8 hours across the month. That is between Hermosillo's extremes of 14 and 10.3 hours, so days are long enough not to constrain the plan.

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 October itself the daily swing is 14.8 °C, so mornings and afternoons need different clothes.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

October in Hermosillo versus nearby

If Hermosillo is one option among several, the nearby comparison is worth making. Tucson is a better bet in October — 3.1 °C cooler, 1 day more rain. Chihuahua is a better bet in October — 5.7 °C cooler, 2 days more rain.

So: October is a compromise. December is 30 points better and is what Hermosillo is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Hermosillo

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