15-day forecast for Grenchen

From 27 Sep to 12 Oct in Grenchen: 1 day(s) of clear skies expected, highs from 12 to 26 °C and 27.7 mm of precipitation in total. Day-by-day table (Open-Meteo model).

Day	Weather	Min	Max	Precip.	Wind	Confidence
Today	partly cloudy	12 °C	25 °C	0.0 mm	9 km/h	medium
Tomorrow	overcast	14 °C	26 °C	0.0 mm	8 km/h	high
Tue 29 Sep	showers	15 °C	24 °C	0.2 mm	7 km/h	high
Wed 30 Sep	light rain	16 °C	21 °C	0.3 mm	9 km/h	low
Thu 1 Oct	light rain	14 °C	17 °C	4.8 mm	7 km/h	low
Fri 2 Oct	overcast	13 °C	20 °C	0.0 mm	12 km/h	medium
Sat 3 Oct	fog	14 °C	22 °C	0.0 mm	6 km/h	medium

Day	Weather	Min	Max	Precip.	Wind	Confidence
Sun 4 Oct	drizzle	13 °C	17 °C	11.4 mm	7 km/h
Mon 5 Oct	drizzle	10 °C	16 °C	5.4 mm	6 km/h
Tue 6 Oct	light drizzle	7 °C	15 °C	0.3 mm	6 km/h
Wed 7 Oct	light drizzle	6 °C	14 °C	0.6 mm	6 km/h
Thu 8 Oct	light drizzle	6 °C	14 °C	1.5 mm	5 km/h
Fri 9 Oct	light drizzle	8 °C	13 °C	0.3 mm	7 km/h
Sat 10 Oct	light drizzle	6 °C	12 °C	2.4 mm	11 km/h
Sun 11 Oct	light drizzle	7 °C	16 °C	0.5 mm	9 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 9.0 °C in Grenchen, the November norm 3.8 °C (MeteoSwiss 1991–2020, monthly means measured nearby).

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