Arosa -Weisshorn
📍 Grisons , Plessur District · Nearest city: Arosa (3 km)
59 XC score / 100 · takeoff at 2623 m · 📍 View on map
Coordinates and external links
46.78920, 9.63770Forecast next days
Updated: 2026-04-21 01:20 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Flyable day, decent conditions, cloud base ~518 m, wind 16 km/h.
base ~518m · wind 16 km/hFlyable day, decent conditions, cloud base ~1056 m, wind 15 km/h.
base ~1056m · wind 15 km/hFlyable day, decent conditions, cloud base ~1263 m, wind 14 km/h.
base ~1263m · wind 14 km/hComposite flyability score (CAPE + LI + wind + precip + low clouds). Cross-check with local pilots before flying.
Detailed hourly weather
2026-04-21⚠️ Marginal · peak 68 at 16h
- High cloud suck (97/100) — base below freezing with CU
⏰ Useful window: 16:00 – 17:00
| 08 25 ☁️⚠️ | 09 45 ☁️⚠️ | 10 45 ☁️⚠️ | 11 40 ☁️⚠️ | 12 55 ☁️⚠️ | 13 60 ☁️⚠️ | 14 60 ☁️⚠️ | 15 60 ☁️⚠️ | 16 68 ☁️⚠️ | 17 60 ☁️⚠️ | 18 60 ☁️⚠️ | 19 60 ☁️⚠️ | 20 55 ☁️⚠️ |
Peak 16h: CAPE 90 J/kg · LI -0.1 · BL top 1420 m · w* 8.0 m/s · cloud base 3473 m · 0°C at 1900 m · Pro score 58/100 · sun 24° over slope
Hourly flyability (0–100). ⛈️ = storm risk · ☁️⚠️ = cloud suck · 🏔️ = active ridge lift. CAPE = convective energy, LI = stability, BL top = thermal ceiling, w* = estimated dry thermal velocity. Source: Open-Meteo (ECMWF/GFS/ICON blend model).
Estimated vertical profile (Sounding)
Reference time: 16:00 (peak of the day)
Surface T: 2.6°C · Td: -4.2°C
LCL (cloud base): 850 m
BL top: 1420 m
0°C level: 1900 m
Approximate profile from surface variables + synoptic levels. Red lines = temperature, dashed blue = dew point. Orange bands = detected inversions.
🌬 Daily wind (next days)
Daily summary (10m wind). Full hour × altitude chart is being added progressively.
Takeoff orientations
Green = good orientation · Yellow = possible · Gray = not suitable
Why this site has thermal potential
| Factor | Value | Interpretation |
|---|---|---|
| Hotspot density (5 km) | 6 | Medium |
| Avg thermal probability | 0.80 | Based on thousands of aggregated IGC flights |
| Solar orientation | 0.44 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Upcoming competitions in this country
- PWCA Italy Gemona 2026 · 2026-07-25 – 2026-08-01 · PWCA
Copa del Mundo en Gemona del Friuli, Italia
Takeoff description
TO's are on top of the 'Weisshorn' (>> see pictures). In Summer the only direction available is SW, in Winter it's also possible to TO towards NE. In Winter TO is performed on the (groomed) ski slopes. Theoretically this is not allowed in Switzerland. On the Weisshorn it's tolerated, as long as one leaves enough space for the skiers/ snowboardes to pass... TO to the NNW: VERY short, there is NO space for an aborted TO!!! (see picture).
Rules and notes
Airspaces in Switzerland are a tough subject, get all the info you can get before flying: http://www.flyland.ch. DABS (active danger areas etc): http://www.skybriefing.com/portal/home For flights to Chur (and North towards Landquart): Heliport Untervaz becomes a factor (> see pix).
Pilot comments
Cable car to Weisshorn: Summer 2024: 8.june -20.october
Nearby sites
Arosa -Brueggerhorn (54) · Arosa - Hoernli / Hörnli (54) · Urdenfürkli / Urdenfürggli (47) · Guergaletsch -2400 (30) · Parpaner Rothorn -2800 (54) · Churer Joch (8)