What is the hottest city in Isère?

Grenoble, at 35.3 days, ahead of Saint-Martin-d'Hères (35.3 days).

What is the coolest city in Isère?

Voiron, at 21.3 days. 16 cities of Isère are measured here.

Where does Grenoble stand in France?

114 of the 1,040 French cities measured on days above 30 °c. The national ranking is on its own page.

Which cities lead in Isère?

Grenoble (35.3 days), Saint-Martin-d'Hères (35.3 days), Échirolles (35.3 days), Fontaine (35.3 days), Meylan (35.3 days). The whole table is on this page.

Le Bon Rang

In Isère · Météo-France, fiches climatologiques

The hottest cities in Isère

Grenoble is the hottest city in Isère, at 35.3 days, ahead of Saint-Martin-d'Hères (35.3 days) and Échirolles (35.3 days). At the other end, Voiron is the coolest city, at 21.3 days.

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The 16 cities of Isère ranked on days above 30 °c
Rank	City	Days above 30 °C	Population
1	Grenoble	35.3 days	156,140
2	Saint-Martin-d'Hères	35.3 days	37,695
3	Échirolles	35.3 days	37,491
4	Fontaine	35.3 days	22,020
5	Meylan	35.3 days	18,770
6	Saint-Égrève	35.3 days	17,986
7	Seyssinet-Pariset	35.3 days	11,739
8	Sassenage	35.3 days	11,646
9	Le Pont-de-Claix	35.3 days	10,956
10	Eybens	35.3 days	10,493
11	Vienne	30.6 days	31,778
12	Charvieu-Chavagneux	26.3 days	10,547
13	Bourgoin-Jallieu	25.0 days	30,151
14	Villefontaine	25.0 days	19,445
15	L'Isle-d'Abeau	25.0 days	17,515
16	Voiron	21.3 days	21,847

Every city of Isère →

The same ranking for the whole of France : The hottest cities in France · The coolest cities in France in summer

The hottest cities in, elsewhere

The other rankings of Isère

Scope, method and sources

Scope: France, metropolitan and overseas, Corsica and the DROM included. This dataset holds every commune of 10,000 inhabitants or more, plus smaller communes famous enough to be household names, 1,131 in all. It is not the full list of 35,000 French communes, so a village can sit outside a ranking whose extreme it would otherwise hold. This particular ranking is metropolitan only: the distance to the coast is measured against the coastlines of the Hexagon and Corsica, which would put an overseas port thousands of kilometres from a sea it sits on, so no value is published for overseas France rather than a wrong one.

Method and sources: populations are the INSEE legal populations, boundaries and coordinates come from the IGN commune registry, both served by geo.api.gouv.fr. Density is the population divided by the commune's area; distances are measured as the crow flies from the commune's centre. Data read on August 28, 2026.

4 questions about this ranking

What is the hottest city in Isère?: Grenoble, at 35.3 days, ahead of Saint-Martin-d'Hères (35.3 days).
What is the coolest city in Isère?: Voiron, at 21.3 days. 16 cities of Isère are measured here.
Where does Grenoble stand in France?: 114 of the 1,040 French cities measured on days above 30 °c. The national ranking is on its own page.
Which cities lead in Isère?: Grenoble (35.3 days), Saint-Martin-d'Hères (35.3 days), Échirolles (35.3 days), Fontaine (35.3 days), Meylan (35.3 days). The whole table is on this page.