Sonora weather in September
September is a fair month to visit Sonora: 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.
Figures are long-term averages for Hermosillo, the largest city in Sonora. See below for other places.
Is September a good time to visit Sonora?
fair month Weather score 60/100.
September is a fair month in Sonora. The weather is usually best in Oct–May.
Does it rain a lot in Sonora 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 Sonora in September?
Days average 36°C (97°F) and nights 23°C (74°F).
Sonora 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
Weather across Sonora in September
Weather can differ a lot within Sonora: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Hermosillo | 36°C (97°F) | 23°C (74°F) | 80 mm | fair |
| Ciudad Obregón | 35°C (94°F) | 25°C (77°F) | 99 mm | least pleasant |
| Nogales | 32°C (89°F) | 18°C (64°F) | 51 mm | fair |
| San Luis Río Colorado | 40°C (103°F) | 23°C (74°F) | 11 mm | least pleasant |
| Heroica Guaymas | 35°C (95°F) | 25°C (76°F) | 89 mm | least pleasant |
| Navojoa | 34°C (92°F) | 24°C (76°F) | 113 mm | fair |
| Agua Prieta | 30°C (86°F) | 16°C (61°F) | 43 mm | best |
| Puerto Peñasco | 34°C (94°F) | 26°C (79°F) | 19 mm | least pleasant |
| Heroica Caborca | 35°C (96°F) | 22°C (71°F) | 59 mm | fair |
| Empalme | 35°C (95°F) | 25°C (76°F) | 89 mm | least pleasant |
| Esperanza | 35°C (94°F) | 25°C (77°F) | 99 mm | least pleasant |
| Cananea | 29°C (85°F) | 16°C (60°F) | 52 mm | fair |