What is the hottest city in Yvelines?

Sartrouville, at 15.8 days, ahead of Saint-Germain-en-Laye (15.8 days).

What is the coolest city in Yvelines?

Voisins-le-Bretonneux, at 9.0 days. 42 cities of Yvelines are measured here.

Where does Sartrouville stand in France?

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

Which cities lead in Yvelines?

Sartrouville (15.8 days), Saint-Germain-en-Laye (15.8 days), Houilles (15.8 days), Chatou (15.8 days), Maisons-Laffitte (15.8 days). The whole table is on this page.

Le Bon Rang

In Yvelines · Météo-France, fiches climatologiques

The hottest cities in Yvelines

Sartrouville is the hottest city in Yvelines, at 15.8 days, ahead of Saint-Germain-en-Laye (15.8 days) and Houilles (15.8 days). At the other end, Voisins-le-Bretonneux is the coolest city, at 9.0 days.

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The 42 cities of Yvelines ranked on days above 30 °c
Rank	City	Days above 30 °C	Population
1	Sartrouville	15.8 days	52,763
2	Saint-Germain-en-Laye	15.8 days	45,931
3	Houilles	15.8 days	33,983
4	Chatou	15.8 days	30,598
5	Maisons-Laffitte	15.8 days	23,093
6	La Celle-Saint-Cloud	15.8 days	20,460
7	Marly-le-Roi	15.8 days	16,756
8	Le Pecq	15.8 days	16,059
9	Le Vésinet	15.8 days	15,554
10	Carrières-sur-Seine	15.8 days	14,791
11	Montesson	15.8 days	14,549
12	Croissy-sur-Seine	15.8 days	11,013
13	Mantes-la-Jolie	12.3 days	43,526
14	Mantes-la-Ville	12.3 days	22,332
15	Limay	12.3 days	17,885
16	Aubergenville	12.3 days	12,723
17	Versailles	11.3 days	84,095
18	Le Chesnay-Rocquencourt	11.3 days	30,689
19	Guyancourt	11.3 days	29,778
20	Vélizy-Villacoublay	11.3 days	23,011
21	Viroflay	11.3 days	17,237
22	Conflans-Sainte-Honorine	9.7 days	36,958
23	Les Mureaux	9.7 days	34,632
24	Achères	9.7 days	22,241
25	Carrières-sous-Poissy	9.7 days	20,825
26	Verneuil-sur-Seine	9.7 days	16,280
27	Andrésy	9.7 days	13,834
28	Triel-sur-Seine	9.7 days	12,206
29	Chanteloup-les-Vignes	9.7 days	10,861
30	Poissy	9.0 days	40,983
31	Trappes	9.0 days	34,689
32	Montigny-le-Bretonneux	9.0 days	32,465
33	Plaisir	9.0 days	31,811
34	Rambouillet	9.0 days	27,724
35	Élancourt	9.0 days	26,365
36	Saint-Cyr-l'École	9.0 days	21,268
37	Maurepas	9.0 days	20,629
38	Les Clayes-sous-Bois	9.0 days	16,804
39	Bois-d'Arcy	9.0 days	16,586
40	Fontenay-le-Fleury	9.0 days	13,680
41	Villepreux	9.0 days	11,931
42	Voisins-le-Bretonneux	9.0 days	10,624

Every city of Yvelines →

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 Yvelines

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 Yvelines?: Sartrouville, at 15.8 days, ahead of Saint-Germain-en-Laye (15.8 days).
What is the coolest city in Yvelines?: Voisins-le-Bretonneux, at 9.0 days. 42 cities of Yvelines are measured here.
Where does Sartrouville stand in France?: 415 of the 1,040 French cities measured on days above 30 °c. The national ranking is on its own page.
Which cities lead in Yvelines?: Sartrouville (15.8 days), Saint-Germain-en-Laye (15.8 days), Houilles (15.8 days), Chatou (15.8 days), Maisons-Laffitte (15.8 days). The whole table is on this page.