Monterrey weather in September
September is one of the least pleasant months in Monterrey: highs of 25°C (77°F) and about 132 mm (5.2 in) of rain on average. Nights average 14°C (57°F) and cloud cover 52% (NASA POWER, 2001–2025 averages). It is the wettest month of the year and the 6th warmest. Compared with August, it is cooler and wetter; October brings highs of 24°C (76°F) and 43 mm (1.7 in) of rain.
Is September a good time to visit Monterrey?
least pleasant month Weather score 68/100.
September is one of the least pleasant months for weather in Monterrey. For better conditions, consider Feb–May, Oct–Dec.
Does it rain a lot in Monterrey in September?
Some rain is normal: about 132 mm (5.2 in) falls in an average September. It is the wettest month of the year.
How warm is Monterrey in September?
Days average 25°C (77°F) and nights 14°C (57°F).
Monterrey weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 18°C (65°F) | 3°C (38°F) | 17 mm | 48% | fair |
| February | 21°C (70°F) | 5°C (41°F) | 15 mm | 45% | best |
| March | 24°C (76°F) | 8°C (46°F) | 23 mm | 45% | best |
| April | 28°C (83°F) | 12°C (53°F) | 23 mm | 47% | best |
| May | 30°C (85°F) | 14°C (57°F) | 44 mm | 46% | best |
| June | 30°C (85°F) | 15°C (60°F) | 55 mm | 42% | fair |
| July | 29°C (83°F) | 15°C (59°F) | 86 mm | 47% | fair |
| August | 28°C (83°F) | 15°C (59°F) | 58 mm | 41% | fair |
| September | 25°C (77°F) | 14°C (57°F) | 132 mm | 52% | least pleasant |
| October | 24°C (76°F) | 11°C (51°F) | 43 mm | 37% | best |
| November | 21°C (70°F) | 7°C (44°F) | 20 mm | 38% | best |
| December | 19°C (66°F) | 4°C (39°F) | 15 mm | 44% | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months