Hermosillo weather in September
September is a fair month to visit Hermosillo: highs of 36°C (97°F) and about 80 mm (3.1 in) of rain on average. Nights average 23°C (74°F) and cloud cover 33% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 4th warmest. Compared with August, it is cooler and drier; October brings highs of 33°C (91°F) and 14 mm (0.6 in) of rain.
Is September a good time to visit Hermosillo?
fair month Weather score 60/100.
September is a fair month in Hermosillo. The weather is usually best in Oct–May.
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Does it rain a lot in Hermosillo in September?
Some rain is normal: about 80 mm (3.1 in) falls in an average September. It is the 3rd wettest month of the year.
How warm is Hermosillo in September?
Days average 36°C (97°F) and nights 23°C (74°F).
Hermosillo weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 24°C (74°F) | 9°C (47°F) | 16 mm | 32% | best |
| February | 25°C (77°F) | 9°C (49°F) | 13 mm | 36% | best |
| March | 29°C (84°F) | 12°C (53°F) | 9 mm | 30% | best |
| April | 32°C (89°F) | 14°C (58°F) | 2 mm | 26% | best |
| May | 35°C (96°F) | 18°C (64°F) | 1 mm | 17% | best |
| June | 40°C (103°F) | 23°C (74°F) | 12 mm | 24% | least pleasant |
| July | 37°C (99°F) | 26°C (79°F) | 110 mm | 59% | least pleasant |
| August | 37°C (98°F) | 26°C (78°F) | 99 mm | 51% | least pleasant |
| September | 36°C (97°F) | 23°C (74°F) | 80 mm | 33% | fair |
| October | 33°C (91°F) | 18°C (65°F) | 14 mm | 20% | best |
| November | 28°C (82°F) | 13°C (56°F) | 15 mm | 28% | best |
| December | 23°C (73°F) | 9°C (47°F) | 12 mm | 32% | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
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