Hermosillo weather in September

Forum posters describe August in Hermosillo as squarely within the brutal mid-June-through-August heat stretch, with daytime highs consistently in the 100sF and posters citing days reaching as high as 115-120F, sometimes hitting 100F by mid-morning on the hottest days, with nighttime lows only easing into the high 80sF. Posters describe the desert heat as genuinely horrendous for anyone not used to it, made harder by many local venues lacking air conditioning, though evenings are usually described as pleasant even in the depths of summer. Posters note the rainy season, which peaks in July and August, does bring higher humidity alongside a slight moderation in raw temperature. One forum poster's blunt advice: don't visit Hermosillo June through September unless you specifically enjoy extreme desert heat. Posters generally rate August as extremely hot and genuinely demanding for Hermosillo, manageable only with reliable air conditioning and realistic expectations.

Forum posters describe November through April as the good-weather stretch in Hermosillo, a real contrast to the brutal mid-afternoon heat posters say can reach 45C during the July-September peak. Posters describe daytime temperatures in the neighboring winter months as commonly in the 70sF with nighttime lows dropping to the high-40s or high-50sF, generally dry conditions typical of this part of the Sonoran Desert. Posters are consistent that Hermosillo isn't really set up as a tourist destination in the traditional sense - it's a large, busy city of over a million people with real traffic - but posters describe it as safe, with plenty of dining options and good hotels for anyone passing through during this comfortable winter window.