The best time to visit Lisbon and Porto is during the spring (March to May) and autumn (September to November). During these months, the weather is pleasant, with mild temperatures and less rainfall compared to winter, making it ideal for sightseeing. The summer months (June to August) can be quite hot and crowded, especially in Lisbon, while the winter months (December to February) are cooler and may have more rain, particularly in Porto, though still a great time for a quieter visit. 

Choosing between Porto and Lisbon depends on what you're looking for. Lisbon, the vibrant capital, offers a cosmopolitan atmosphere with a mix of historic sites, modern attractions, and lively nightlife. It’s larger, more diverse, and bustling with tourists, making it ideal for those seeking a dynamic city experience. Porto, on the other hand, is smaller, more relaxed, and known for its charming, historic feel and scenic river views. It’s perfect for those who prefer a more intimate, traditional atmosphere and enjoy wine culture. Both cities have their unique appeal, and many travelers opt to visit both for a full Portuguese experience.

The train ride from Lisbon to Porto typically takes around 2.5 to 3 hours, depending on the type of train you choose. The Alfa Pendular, which is the fastest and most comfortable option, takes about 2 hours and 30 minutes. The Intercidades (intercity) trains take slightly longer, usually around 3 hours. Both options offer comfortable seating, free Wi-Fi on some services, and scenic views of the Portuguese countryside.

Yes, Fátima is located between Lisbon and Porto, though it is closer to Lisbon. Situated about 130 km (81 miles) north of Lisbon and around 200 km (124 miles) south of Porto, it makes for a popular stop for travelers journeying between the two cities. Fátima is renowned for its Sanctuary of Our Lady of Fátima, a major pilgrimage site for Catholics. If you’re traveling by car or bus, it takes around 1.5 to 2 hours to reach Fátima from Lisbon, and about 2.5 to 3 hours from Porto. It's an ideal place to visit if you're interested in religious tourism or looking for a peaceful, spiritual stop along your route.