15-day forecast for Grindelwald

From 27 Sep to 12 Oct in Grindelwald: 2 day(s) of clear skies expected, highs from 11 to 23 °C and 115.0 mm of precipitation in total. Day-by-day table (Open-Meteo model).

Day	Weather	Min	Max	Precip.	Wind	Confidence
Today	sunny	9 °C	23 °C	0.0 mm	5 km/h	medium
Tomorrow	overcast	11 °C	23 °C	0.0 mm	5 km/h	medium
Tue 29 Sep	overcast	17 °C	23 °C	0.0 mm	8 km/h	low
Wed 30 Sep	fog	16 °C	22 °C	0.1 mm	5 km/h	low
Thu 1 Oct	light rain	13 °C	16 °C	6.2 mm	3 km/h	medium
Fri 2 Oct	overcast	13 °C	17 °C	0.0 mm	8 km/h	medium
Sat 3 Oct	thunderstorms	14 °C	19 °C	2.4 mm	8 km/h	low

Day	Weather	Min	Max	Precip.	Wind	Confidence
Sun 4 Oct	thunderstorms	14 °C	18 °C	36.6 mm	6 km/h
Mon 5 Oct	showers	11 °C	14 °C	23.7 mm	6 km/h
Tue 6 Oct	showers	9 °C	11 °C	18.6 mm	4 km/h
Wed 7 Oct	light drizzle	7 °C	15 °C	1.8 mm	5 km/h
Thu 8 Oct	light drizzle	8 °C	16 °C	3.0 mm	5 km/h
Fri 9 Oct	light drizzle	9 °C	14 °C	3.3 mm	4 km/h
Sat 10 Oct	heavy drizzle	8 °C	13 °C	9.9 mm	5 km/h
Sun 11 Oct	heavy drizzle	6 °C	12 °C	9.4 mm	10 km/h
Mon 12 Oct	overcast	– °C	– °C	– mm	– km/h

Confidence index: agreement of 4 independent models (ICON, GFS, IFS, ARPEGE) on the daily high and on rain. High = highs within 2 °C and the same rain verdict; low = more than 4 °C apart or models split on rain.

And at 20, 25 or 30 days? No model seriously forecasts that far. Climatology takes over: the October norm is 7.7 °C in Grindelwald, the November norm 2.8 °C (MeteoSwiss 1991–2020, monthly means measured nearby).

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