Добрый день Gospodin Petrovski.
Welcome to Mt Swiss Alps.
I like your plan, You have set good priorities.
Weather is tough to predict, even 49 hours in advance, because the Alps make their. During October, the tourist facilities tend to shut down, due to lack of warm weather or, alternately, snow for skiing.
Check links within.
Also there are plenty of internet sites with average temperatures, such as :
Altitude is very important for weather.
www.jungfrau.ch/en/som mer/tourism/destinatio ns/kleine-scheidegg/hiking-trails/
Check cableways in the timetable for your dates, such as Wengen Wengiboden to Männlichen, to learn if they are running....probably OK in early October.
Use the timetable:
Best and most detailed map may be more than you need, but, start with the best. ;-)
Here it is:
map.geo.admin.ch/?topic=ech&lang=en&bgLa yer=ch.swisstopo.pixel karte-farbe&layers=ch.bav.ha ltestellen-oev,ch.swisstopo.swiss tlm3d-wanderwege&layers_visi bility=false,true&X=16 1450.00&Y=633625.00&zo om=4
You can turn off the trails overlay.