Saint-Arnoult-en-Yvelines

What is the climate like in Saint-Arnoult-en-Yvelines?

The best time to visit Saint-Arnoult-en-Yvelines is typically June – September, with trip comfort peaking in July (7.7/10). Saint-Arnoult-en-Yvelines is warmest in July, when daily highs average 78°F (26°C), and coolest in January, when lows fall to about 36°F (2°C). The wettest month is typically October and the driest is July; the year sees roughly 30 in (753 mm) of precipitation.

• Best time to visitJune – September — comfort peaks in July (7.7/10)
• Warmest monthJuly — average high 78°F (26°C)
• Coolest monthJanuary — average low 36°F (2°C)
• Wettest monthOctober (3.2 in (82 mm))
• Driest monthJuly (1.8 in (45 mm))
• Annual precipitation30 in (753 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromOrly, 36 km away (1921-2026)