La Diagonale des Fous, Grand Raid de La Réunion 2027: felt heat and shade along the course

La Diagonale des Fous, Grand Raid de La Réunion 2027: 175 km and 10,200 m of climbing, on 15 October 2027. Cut-off: 66 h.

For this race, SHADE (shaderoutes.com) computes the real shade along the official course (trees, terrain, buildings) and the felt temperature, in degrees, at every checkpoint, at the time you will be there at your own pace. While the race is more than two weeks away, the weather used is the ten-year normal for the same date (ERA5 reanalysis): it is not a forecast. Free, no account.

Reference course. It changes noticeably between editions: check the official roadbook.

Checkpoints

Checkpoint	km	Altitude (m)	Difference due to altitude, vs. the start
Saint-Pierre · départ	0	10	0 °C
Domaine Vidot	15	470	−3 °C
Notre-Dame-de-la-Paix	32	1,585	−10 °C
Nez de Bœuf	45	2,080	−13 °C
Mare à Boue	55	1,660	−11 °C
Cilaos	75	1,200	−8 °C
Col du Taïbit	86.5	2,082	−13 °C
Marla	88.5	1,620	−10 °C
Trois Roches	96	1,350	−9 °C
Grand Place les Hauts	104	1,050	−7 °C
Deux Bras	112	300	−2 °C
Îlet Alcide	121	850	−5 °C
Roche Plate	128	1,080	−7 °C
Sans Souci	140	340	−2 °C
Possession	150	20	0 °C
Colorado	163	810	−5 °C
Saint-Denis · arrivée	175	10	0 °C

Altitude alone: about 6.5 °C cooler per 1,000 m. Shade, sun, wind and humidity are added by SHADE.

Official race website · Version française · SHADE: loops in the shade · All races · Method · Run in the shade, city by city