Mazatlán weather in September
September in Mazatlán: hot, soaked, with clean air — fine if you can take 19 rainy days.
#11 of 12 months in Mazatlán · #498 of 897 destinations to visit in September · comfort 81/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Mazatlán in September
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Mazatlán climate normals — September
| Daytime high | 31°C / 87°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Rainfall | 156 mm / 6.1 in | ⛈ soaked |
| Rainy days | 19 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 26°C / 78°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 12.3 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Mazatlán in September — FAQ
- Is September a good time to visit Mazatlán?
- September in Mazatlán: hot, soaked, with clean air — fine if you can take 19 rainy days. It ranks #11 of 12 months for Mazatlán on SeasonMap's comfort score (81/100).
- What is the weather like in Mazatlán in September?
- In September, Mazatlán averages a daily high of 30.5°C and a low of 25.8°C, with about 155.5 mm of rain over roughly 19.2 rainy days.
- What is the air quality in Mazatlán in September?
- Mazatlán has a mean US Air Quality Index of about 34 in September.