Next open dayWed 12 Aug2,166 mgondola

Grindelwald First

PEAK91/100

Medium confidence

Conditions line up tomorrow. Best window 08:00–11:00 — go.

Live reading · 17:00 UTC

Instrument reading

Best time tomorrow

08:00–11:0091/100

Evidence for the window

The verdict above is for tomorrow — these are tomorrow's hours, the ones the engine actually scored, with the recommended window lit below.

Rows: local time · temp °C · wind km/h · precip chance % · cloud base m

Cloud base over tomorrow's hours (Wed 12 Aug), 05:00–22:00 local time, against the 2,166 m summit; 11 of 18 hours are clear above it.
Local time	Operating	Temperature (°C)	Wind (km/h)	Precipitation chance (%)	Cloud base (m)	In recommended window
05:00	closed	13	5	0	clear above the summit	no
06:00	closed	12	5	0	clear above the summit	no
07:00	closed	13	4	0	clear above the summit	no
08:00	open	14	3	0	clear above the summit	yes
09:00	open	16	1	0	clear above the summit	yes
10:00	open	17	1	0	clear above the summit	yes
11:00	open	17	2	0	clear above the summit	no
12:00	open	18	3	0	clear above the summit	no
13:00	open	18	4	0	clear above the summit	no
14:00	open	18	6	0	not reported	no
15:00	open	19	9	0	3280 m	no
16:00	open	18	14	0	2900 m	no
17:00	open	17	10	38	not reported	no
18:00	closed	17	7	43	3220 m	no
19:00	closed	17	5	10	3020 m	no
20:00	closed	16	3	0	not reported	no
21:00	closed	15	5	0	clear above the summit	no
22:00	closed	15	5	0	clear above the summit	no

The signature reading

The question a forecast percentage cannot answer: is the viewpoint above the cloud, or inside it, right now?

The verdict above is for the next day — this reading is what the sky looks like right now, not then.

Cloud base is around 2900 m, above the 2,166 m viewpoint. The air at the top should be clear, under an overcast sky.

The reasoning, audited

5-day shape