Stage 1 · 1 August 2026

Lausanne → Lausanne

138 kmFlat

Observed conditions from the ERA5 reanalysis archive.

Observed heat snapshot

+7.0°Cvs the 1974-2023 average at this location (ERA5): 23.1°C

30.1°Cpeak in the race window

Moderate high-risk · 27°C WBGT (est.)

Schematic — real elevation, approximate route between known points, not survey-accurate. Fill colored by temperature.

+10°C26°C+42°C

Decade trend — deviation from the 50-year mean at this location

22.2°C'74–'83

22.5°C'84–'93

23.3°C'94–'03

22.8°C'04–'13

24.8°C'14–'23

-2°C50-yr avg+2°C

A day this hot (≥30.1°C, ERA5 at this location) occurred 4× in 1974-1983 vs. 25× in 2014-2023.

WBGT is an estimate — see methodology. Data as of 2026-08-13T12:21:21.256Z.