Monthly climate guide
Monterrey weather in September
September in Monterrey is typically warm, with average daytime highs around 27°C (80°F) and night-time lows near 15°C (59°F). The month usually brings about 126 mm of rain (wet) and is a mix of sun and cloud. Daytime highs are 3°C cooler than August and about the same as October.
What stands out in September
- Just 70 km apart, but Monterrey runs about 2°C cooler than Saltillo this month.
- September brings early autumn to Monterrey.
- Rain is above Monterrey's usual level, by about 201%.
- Expect more cloud than at any other time of year.
It's usually the wettest month of the year.
Avg high
27°C
80°F
Avg low
15°C
59°F
Rainfall
126 mm
wet
Humidity
71%
relative
Sky
50%
cloud · a mix of sun and cloud
Monterrey weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 19°C / 67°F | 4°C / 40°F | 18 mm | 57% | 47% |
| February | 23°C / 73°F | 7°C / 44°F | 13 mm | 51% | 44% |
| March | 25°C / 77°F | 9°C / 49°F | 32 mm | 50% | 45% |
| April | 29°C / 84°F | 12°C / 54°F | 22 mm | 45% | 45% |
| May | 30°C / 86°F | 15°C / 59°F | 45 mm | 55% | 46% |
| June | 30°C / 86°F | 16°C / 60°F | 58 mm | 61% | 42% |
| July | 29°C / 85°F | 16°C / 60°F | 63 mm | 62% | 45% |
| August | 30°C / 85°F | 16°C / 60°F | 47 mm | 63% | 37% |
| September | 27°C / 80°F | 15°C / 59°F | 126 mm | 71% | 50% |
| October | 26°C / 78°F | 12°C / 53°F | 33 mm | 67% | 34% |
| November | 22°C / 72°F | 8°C / 47°F | 26 mm | 65% | 42% |
| December | 21°C / 69°F | 6°C / 42°F | 19 mm | 58% | 46% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- An extra layer — evenings are noticeably cooler than afternoons
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Monterrey?
Compare the months in the chart above to find your ideal window.
Best time to visit Monterrey →Other Mexico cities in September
Cite or embed this data
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Monterrey weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/mexico/monterrey/september
<a href="https://weathercompare.eu/weather/mexico/monterrey/september">Monterrey weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/mexico/monterrey" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Monterrey weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/mexico/monterrey/september">Monterrey weather in September</a> – WeatherCompare</p>
Monterrey in September: quick answers
Is September a good time to visit Monterrey?
September is one of the wetter months in Monterrey, with about 126 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Monterrey in September?
Average highs are about 27°C (80°F) and average lows about 15°C (59°F), based on 10 years of daily data.
Does it rain a lot in Monterrey in September?
Monterrey typically gets around 126 mm of rain in September — wet. It's usually the wettest month of the year.
Figures are long-term averages for the area around Monterrey (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.