There is no such thing as one weather pattern in all of October in Costa Rica. Along the Pacific Coast, it is one of the wettest times of the year. While temperatures might make it to the 80s each day, there is also daily rain. In fact, many smaller hotels and tourist businesses on the Pacific Coast close down completely in October. Head across the country to the Caribbean Coast, and it’s a completely different story. October on the Caribbean Coast means temperatures of 90 degrees and sunny days.
If you’re along the Caribbean Coast in October, don’t miss Carnival in Limon. This is one of the most exciting, vibrant and festive days of the year in the region.
All this means exactly what you might expect: It’s affordable by the Pacific, and more expensive closer to the Caribbean. One option is to split the difference head inland to cities like Heredia. Although Heredia is just outside of San Jose, it has a completely different vibe. As a university town, Heredia is progressive, youthful and full of nightlife options. Head to the city’s central plaza to see the 18th century Iglesia de la Inmaculada Concepción, and then venture out to see the remains of the 19th century fort known as El Fortín. Bring comfortable shoes, because the whole city is walkable and you’ll probably spend a lot of time on your feet.
Just outside of Heredia is the Hotel Chalet Tirol, a group of small, colorful buildings that look like they could be in the Alps rather than Costa Rica. Although the hotel is very affordable, you can look forward to mountain views from every single room. While you’re in Heredia, check out Soda Paco Alfaro, a local restaurant serving up delicious, authentic and simple Costa Rican meals.
For more information about when to travel to Costa Rica, we recommend reading the following articles:
Travel 
Map 
Destinations 
Vacation 
Hotels 
Tours 
Transportation 
Blog