Hermosillo weather in September
September in Hermosillo: sweltering, a little rain, with clean air — a gamble, with 37°C afternoons.
#9 of 12 months in Hermosillo · #808 of 897 destinations to visit in September · comfort 58/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Hermosillo in September
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Hermosillo climate normals — September
| Daytime high | 37°C / 98°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Rainfall | 30 mm / 1.2 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 53% | 🍃 comfortable |
| Dew point | 18°C / 64°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 12.3 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Hermosillo in September — FAQ
- Is September a good time to visit Hermosillo?
- September in Hermosillo: sweltering, a little rain, with clean air — a gamble, with 37°C afternoons. It ranks #9 of 12 months for Hermosillo on SeasonMap's comfort score (58/100).
- What is the weather like in Hermosillo in September?
- In September, Hermosillo averages a daily high of 36.8°C and a low of 24.9°C, with about 30.1 mm of rain over roughly 5.6 rainy days.
- What is the air quality in Hermosillo in September?
- Hermosillo has a mean US Air Quality Index of about 35 in September.