Tamarindo Fishing Seasons by Species

http://www.travelcostaricaonline.com/tamarindo-fishing.html

Sailfish: The best months are from May through August. Bites are least frequent from late August throught November.

Marlin: Blue marlin are more common than black marlin, and the best time of year is from the middle of November to the beginning of March. Another peak time is from early June to the end of August or beginning of September.

Dorado (Mahi mahi): Late May through October is the best time of year for this tasty fish, during the rainy season when debris is being carried out to sea by the rivers. Dorado like to swim beneath floating debris, like logs and rafts of junk.

Roosterfish: This fish can be caught year round in the Gulf of Papagayo, depending on the water conditions. However November through March are the most productive months. The Bat Islands are a hot spot for this fish (and a great diving spot).

Tuna: August through October is the best time for Yellowfin, with the waters between Tamarindo and the Catalina Islands being the best spot, an area less than thirty minutes from Tamarindo beach.

Wahoo: The bite for wahoo is around the rainy season, like Dorado, starting in mid-May, with peak season from July through August. They're often caught around rocky marine topography like the Catalina and Bat Islands, but in season they can be found offshore too.