Scottsdale weather in September
September in Scottsdale: sweltering, a little rain, with clean air — a fair time to visit.
#9 of 12 months in Scottsdale · #527 of 604 destinations to visit in September · comfort 58/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Scottsdale climate normals — September
| Daytime high | 38°C / 100°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 24°C / 75°F | |
| Feels like (high) | 37°C / 99°F | |
| Rainfall | 34 mm / 1.3 in | 🌦 some rain |
| Rainy days | 4 days | |
| Humidity | 34% | 🌵 dry |
| Dew point | 11°C / 51°F | |
| Sunshine | 11.1 h/day | |
| Daylight | 12.4 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Scottsdale in September — FAQ
- Is September a good time to visit Scottsdale?
- September in Scottsdale: sweltering, a little rain, with clean air — a fair time to visit. It ranks #9 of 12 months for Scottsdale on SeasonMap's comfort score (58/100).
- What is the weather like in Scottsdale in September?
- In September, Scottsdale averages a daily high of 37.6°C and a low of 24.1°C, with about 34.1 mm of rain over roughly 3.8 rainy days.
- What is the air quality in Scottsdale in September?
- Scottsdale has a mean US Air Quality Index of about 45 in September.