Monterrey Weather in September
In September, Monterrey averages a high of 32°C (90°F) and a low of 21°C (70°F), from 38 years of daily records (1971–2025).
32°C
Average high
90°F
21°C
Average low
70°F
41°C
Record high
106°F · September 27, 2011
13°C
Record low
55°F · September 20, 1971
What September Is Like in Monterrey
- 5 of the 10 warmest Septembers on record in Monterrey have come since 2011.
- A typical September brings 9.3 days above 35°C (95°F).
- The coldest September reading, 13°C (55°F) on September 20, 1971, has not been matched in 54 years.
- September is the wettest month of the year in Monterrey, averaging 142 mm of rain.
At least 1 mm of rain falls on 24% of September days, and the month averages 142 mm in total.
Warmest: 2023 (38.6°C)Latest: 2023 (38.6°C)10-year averageLong-run average (32.2°C)
Look Up a Day in September
See the weather in Monterrey on any September date, year by year.
Source: NOAA GHCN-Daily, Topo Chico (1971–2005); Monterrey (City) (1982–2025). Averages cover 1971–2025. How we compute this