Monterey weather in September
September in Monterey: nice, dry, with clean air — one of the best months to visit.
#2 of 12 months in Monterey · #310 of 897 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Monterey in September
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Monterey climate normals — September
| Daytime high | 20°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 58°F | |
| Rainfall | 4 mm / 0.1 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 14°C / 56°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 12.4 h | |
| Wind | 14 km/h / 8 mph | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Monterey in September — FAQ
- Is September a good time to visit Monterey?
- September in Monterey: nice, dry, with clean air — one of the best months to visit. It ranks #2 of 12 months for Monterey on SeasonMap's comfort score (87/100).
- What is the weather like in Monterey in September?
- In September, Monterey averages a daily high of 19.6°C and a low of 14.3°C, with about 3.6 mm of rain over roughly 0.8 rainy days.
- What is the air quality in Monterey in September?
- Monterey has a mean US Air Quality Index of about 33 in September.