What is the weather like in Chamonix vs Lyon in September?

In September, Chamonix averages 19°C high / 10°C low with about 130 mm of rain; Lyon averages 25°C high / 14°C low with about 67 mm.

Chamonix vs Lyon in September

Lyon is the better pick in September — 93 vs 21 on SeasonMap's comfort score. Lyon is warm, a little rain, clean air, while Chamonix is nice, rainy, clean air.

Chamonix vs Lyon — September climate, side by side

	Chamonix	Lyon
Comfort score	21/100 (F)	93/100 (S)
Feels-like high	19°C	24°C
Avg high / low	19° / 10°	25° / 14°
Rainfall	130 mm	67 mm
Rainy days	16	7
Humidity	82%	69%
Air quality (AQI)	37	40

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

Chamonix vs Lyon in September — FAQ

Is September better in Chamonix or Lyon?: Lyon is the better pick in September — 93 vs 21 on SeasonMap's comfort score. Lyon is warm, a little rain, clean air, while Chamonix is nice, rainy, clean air.
What is the weather like in Chamonix vs Lyon in September?: In September, Chamonix averages 19°C high / 10°C low with about 130 mm of rain; Lyon averages 25°C high / 14°C low with about 67 mm.