What is the weather like in Las Vegas vs San Diego in September?

In September, Las Vegas averages 36°C high / 23°C low with about 6 mm of rain; San Diego averages 26°C high / 19°C low with about 6 mm.

Las Vegas vs San Diego in September

San Diego is the better pick in September — 91 vs 61 on SeasonMap's comfort score. San Diego is warm, dry, muggy air, while Las Vegas is sweltering, dry, clean air.

Las Vegas vs San Diego — September climate, side by side

	Las Vegas	San Diego
Comfort score	61/100 (C)	91/100 (S)
Feels-like high	34°C	27°C
Avg high / low	36° / 23°	26° / 19°
Rainfall	6 mm	6 mm
Rainy days	1	1
Humidity	25%	77%
Air quality (AQI)	44	53

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Las Vegas vs San Diego in September — FAQ

Is September better in Las Vegas or San Diego?: San Diego is the better pick in September — 91 vs 61 on SeasonMap's comfort score. San Diego is warm, dry, muggy air, while Las Vegas is sweltering, dry, clean air.
What is the weather like in Las Vegas vs San Diego in September?: In September, Las Vegas averages 36°C high / 23°C low with about 6 mm of rain; San Diego averages 26°C high / 19°C low with about 6 mm.