Winters in Grigny, France are quite chilly, with average temperatures ranging from freezing to mild, and occasional cold snaps. As the seasons shift into spring, temperatures gradually warm up, with April marking a significant increase in averages, reaching around 8°C. Summer months bring pleasant warmth, with July and August averaging around 19°C, but with occasional highs of over 30°C. Autumn sees a return to cooler temperatures, with October experiencing a slight drop in averages before the onset of winter's chill.