Paris is strongest in the Mar–May and Sep–Oct windows, when the verified forecast points to mild 10–21°C conditions for walking between the Louvre, the Seine, and Le Marais. The city earns 3 scores for cultural, foodie, aspirational, luxury, and city-break travel, so a compact itinerary can mix Musée d’Orsay galleries, Saint-Germain cafés, and Montmartre evenings without feeling one-note. US citizens can stay visa-free for up to 90 days within any 180-day Schengen period, making Paris easy to combine with Versailles or another French rail stop.