Monterrey weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: October – April
What is the weather like in Monterrey in September?
In September, Monterrey is hot: daytime highs average 29 °C, and even at night it stays warm at around 21 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 113 mm in total. On about 12 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a good month for a holiday in Monterrey.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 61 | 65 | 83 |
| Day | 33° | 29° | 26° |
| Night | 23° | 21° | 18° |
| Sun | 8 h | 6 h | 6 h |
| Rain days | 4 | 10 | 7 |
More details for September
- Daylight
- 12 h 20 min06:26 – 18:47
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 19 daysdew point 18 °C or moreAll months
- Wind
- 12 km/haverage daily peakAll months
- Cloud cover
- 49 %on averageAll months
- Hot days
- 12 days30 °C or moreAll months
- Time zone
- UTC−6America/Monterrey
How the score comes together
- Temperatureweight 50 %75 %
- Sunshineweight 20 %52 %
- Few rainy daysweight 30 %56 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Monterrey in September: quick answers
Is Monterrey hot in September?
Yes. In September, Monterrey is hot: daytime highs average 29 °C and nights stay around 21 °C. On about 12 days the thermometer climbs to 30 °C or more.
Does it rain much in Monterrey in September?
Rain is frequent, with about 10 rainy days and 113 mm in total.
Monterrey month by month
The whole year in MonterreyAll destinations: MexicoWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences