September travel to Costa Rica is best spent on the Caribbean coast instead of the Pacific. Here you’ll find more pleasant weather and more activities. If you plan your trip during the month of September, be sure to check out our guide and tips for the best areas to visit.

September Weather

The weather in Costa Rica during the month of September is one of extremes.  Generally the Pacific side is at its rainiest, while the Caribbean side is experiencing the best weather of the year.

The Northwest Pacific is the driest area on the Pacific side.  Temperatures will be in the low to mid 80s during the day and a little cooler in the evening.  Though it can rain at any time, the vast majority of rain will be in the late afternoon. Sunny mornings are more common than not and early afternoons are often nice as well.

The Central Pacific is fairly wet during the month of September.  Rains occur almost every day with hard rains in the afternoons and occasional rains in the morning.  Temperatures will be a little cooler than normal, in the low 80s during the day.

The South Pacific is very rainy during the month of September.  Down on the Osa Peninsula, rain is measured in feet versus inches! Temperatures dip a little to the mid to upper 80s, so it will be hot and steamy. Travel to the Osa Peninsula is not advisable during this month as many places are closed.

The Caribbean side is experiencing the best weather of the year in September. Daytime temperatures are usually in the lower 90s.  Rain can occur, but is rare and usually only at night when it does happen.

The Central Valley and Arenal are similar to the Central Pacific beaches with the rain season in full swing.  Daytime temps will usually be in the lower to mid 70s.


It is the heart of the green season and therefore easier to get a good room at a good price on the Pacific side than it is in other seasons. Quality Caribbean side hotels are generally booked solid several months in advance.  Even on the Pacific side, the best hotels and those that offer great Early Booking Specials are almost always at full occupancy even though it is the lowest travel period. 


Many Pacific side hotels offer great green season pricing at 20-30 percent off high season prices.  Many even offer Early Booking Bonuses with free nights or additional discounts for advance reservations.  Please contact us if you would like further information on some of these deals.

Holidays and Festivals

September 15- Independence Day- from Spain in 1821 – Marked with parades, dancers, street parties and the arrival of the Freedom Torch carried from Nicaragua by relay runners. Everyone in the country stops and simultaneously sings the national anthem. In the evening children carry lanterns thru the streets of their town.


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