← All stages
Stage 18 · 23 July 2026

Voiron → Orcières-Merlette

185.2 kmMountain — summit finish

Forecast — subject to change as the stage approaches.

Forecast heat snapshot

+3.1°Cvs the 1974-2023 average at this location (ERA5): 21.7°C

31.8°Cpeak in the race window

Moderate high-risk · 27°C WBGT (est.)
30.3°CVoiron31.8°CCol Bayard24.8°COrcières-Merlette

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

19.8°C'74–'83
21.5°C'84–'93
21.4°C'94–'03
21.5°C'04–'13
24.3°C'14–'23
-2°C50-yr avg+2°C

A day this hot (≥24.8°C, ERA5 at this location) occurred 11× in 1974-1983 vs. 66× in 2014-2023.The threshold here is a forecast, compared against the ERA5 historical record — forecast models and reanalysis can differ slightly even for the same date/location.

WBGT is an estimate — see methodology. Data as of 2026-07-22T06:01:13.577Z.

Climbs