sunset over Corcovado National Park

OSA PENINSULA WEATHER

Osa Peninsula Weather – the sunrise is around 5:15am and the sunsets are at about 5:45pm consistently throughout the year.

Why? We are only about 1,000 kms from the equator.

The lunar cycle will also effect a lot of natural things on the Osa Peninsula from tides to animal habits. You will definitely the efects of the full moon on the Osa Peninsula. 

OsaTourism Osa Peninsula Tourist Information

THE OSA WEATHER

TWO MAIN SEASONS

DRY AND RAINY

DRY SEASON

The weather on the Osa Peninsula Costa Rica has 3 relatively distinct seasons; the Dry Season (High Season); the Green Season; and the Wet Season. Each has its colourful characteristics. 

The dry season is from December – April. Temperatures vary depending on elevation. EcoLodges in the higher elevation have cooler nights. This temperature variation can be felt in the rivers that flow from the mountain tops…as the water cascades down to sea level it warms. The waterfalls on the Osa Peninsula, which there are many, are cooler than the surface of the Pacific Ocean. You can see this effect on the surface of the Golfo Dulce…as rivers of fresh cooler water float on the surface of the warmer seawater, making smooth and shiny trails on the surface of the gulf.

sa Peninsula rivers

kms from the Equator

Sunsets over Osa

GREEN SEASON WITH RAINY MONTHS

The rainy season is from May – November. The rains bring cooler temperatures with them. But May to September is beautiful here with the rivers flowing, waterfalls pumping and things beginning to grow. The storms are incredible to experience. The thunder can be intense, yet is another unique Osa characteristic. The tunes of nature here are magical. And the wildlife reacts to the changes. 

We feel it is important for everyone to know that October and November can be intense. Normally, the most rain we get is in late October and early November. A lot of the ecolodges close during this time for their yearly maintenance. There are still some river crossings that can be dangerous to cross during the rains. 

EcoSystems on the Osa Peninsula

Storm over Corcovado on the Osa

Highest Point on the Osa (meters)

Longest hours of sunlight are in June

Shortest hours of sunlight are in December

Most days with some rain is in October

Least days with some rain is in February

Storm over the Golfo Dulce
Big Storm over the golfo dulce
Storm over the golfo dulce

JUST THE FACTS

The Weather of the Osa Peninsula

December to April

Averge Daily HIGH Temperature

91 Degrees Fahrenheit

32 Degrees Celsius

Average Monthly Rainfall – 8.6 cms

May to September

Averge Daily HIGH Temperature

89 Degrees Fahrenheit

31 Degrees Celsius

Average Monthly Rainfall – 50  cms

October and November

Averge Daily HIGH Temperature

89 Degrees Fahrenheit

31 Degrees Celsius

Average Monthly Rainfall – 63.5 cms

WEATHER ON THE OSA

The sunniest days on the Osa Peninsula are in February which has the most hours of sunshine per day with an average of 7.8 hours of sunshine per day. October has the least sunshine with an average of 4.7 hours of sunshine per day.

The wettest month on the peninsula is October with the most days of rain (18.5 days with some rain).
The driest month on the Osa is February with the least days of rain (2.3 days with some rain).

The ultraviolet index is the highest in April (15.1) and lowest in December (10.7).
A reading above 11 indicates an extreme risk of harm from unprotected sun exposure.

Osa Peninsula Map Beaches

THE OSA TOURIST INFORMATION CENTER

Up-To-Date Tourist Information from the Osa Peninsula

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