With US stocks led by Apple, investors are starting to worry about new concerns about US-China trade negotiations and imminent US tariffs on European imports.
The European benchmark STOXX index closed 0.4 percent higher, its best monthly gain since June. The index rose about 2 percent in the third quarter, taking its year-to-date gains to around 16 percent.
"Equities are very positive with our denial of closing because traders are somewhat less concerned about the US-China trade situation," said David Madden, market analyst at CMC Markets UK, speaking shortly before the close.
The euro zone's leading stock index rose 0.7 percent as dollar-denominated companies were boosted by a drop in the euro on concerns about the single currency's growth.
Germany's DAX gained 0.4 percent, extending gains for the third straight session, according to Reuters.