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Hermosillo Weather in September
Hermosillo in September sees extremely high temperatures, with highs around 38°C (100°F) and overnight lows of 25°C (77°F). Around 59 mm (2.3 in) of rainfall is typical, so a light rain jacket is a sensible addition to your bag.
Rainfall in Hermosillo in September
Historically, September sees about 4 days of rain, with a monthly average of 59 mm (2.3 in). Rainfall tends to arrive in short, intense showers this month. Rain days are few, but the showers can be surprisingly heavy.
Temperature in Hermosillo in September
If you're visiting Hermosillo in September, expect highs of 38°C (100°F) and overnight lows around 25°C (77°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights stay warm at around 25°C (77°F), so light bedding and good ventilation are worth thinking about.
Sunshine in Hermosillo in September
Expect a lot of sunshine this month, with about 238 hours of sun. These sunny conditions add to the overall experience.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Hermosillo. Our weather planner can help you explore destinations with more pleasant weather conditions.
Hermosillo Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
38°C (100°F)
Chance of Rain
12%
Precipitation
59 mm (2.3 in)
Rainy days
4 days
Humidity
48%
Sunshine
238 hours
Percentage Sunshine
Hermosillo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Hermosillo - and find the best time to visit.
Daily Historical Temperatures
47-year average (1976-2025)
Based on our historical records, temperatures in Hermosillo typically stay consistent throughout September, with daily highs averaging around 38°C (100°F). Nights are warm, with lows typically ranging from 24°C (75°F) to 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
47-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Hermosillo in September
Browse day-by-day weather records for Hermosillo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Hermosillo historical weather extremes in September
Based on 20 years of weather observations (2006-2026), these are the most extreme conditions recorded in Hermosillo.
- On September 28, 2024, temperatures climbed to 46°C (115°F), marking the warmest September day on record.
- On September 25, 2019, Hermosillo saw its coldest September day with temperatures maxing out at 27°C (81°F).
- Nighttime temperatures dropped to 16°C (61°F) on September 26, 2017, marking the coldest September night on record.
Best Places in Mexico in September
Find out more about the weather in Mexico and which places have the best travel conditions in this month. See all of Mexico in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Hermosillo in September
Pack for serious heat in Hermosillo in September. Prioritize clothing that breathes and doesn't cling or stick. Lightweight cotton, linen, and moisture-wicking fabrics are ideal. A wide hat provides welcome shade. Wet weather is likely, so pack waterproof gear for multiple rainy days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Hermosillo in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming10/10 -
Camping8/10
Hermosillo 3-Day Forecast
More climate data for Hermosillo
Temperature Rainfall Sunshine Humidity
See the full Hermosillo climate overview or explore weather in Mexico.
Popular in September
Where to go in September - average daytime high across popular destinations.
Puerto Peñasco
34°C (93°F) Los Cabos
32°C (90°F) Tulum31°C (88°F) Cancún30°C (86°F) Playa del Carmen31°C (88°F) Puerto Vallarta29°C (84°F) San Miguel de Allende
27°C (81°F) Mexico City23°C (73°F) Bucket list
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