Costa Rica Weather

 Costa Rica is located geographically only about eight degrees of north latitude of the equatorial line, thus Costa Rican climate is tropical all year round. However, because of the extraordinarily diverse amount of involved factors, the resulting country climate is a set of regional sub-climates. Therefore, the tropical weather of Costa Rica is greatly affected by its geography at the very local level. These factors include the totally heterogeneous relief (ranging from 0 to 3,431 m in only 51,100 km²) and the way as all its components (mountains, volcanoes, plains, valleys and plateaus) are distributed; the situation in respect to the two continental masses as American isthmus; the influence of the Pacific and Atlantic Oceans (sea winds and ocean current with their own temperatures, besides low pressure systems, tropical depressions, tropical storms and hurricanes) and the general atmospheric circulation.

Current Weather of Costa Rica - Updated Satellite Image

Latest Image - GOES-13 1 km (only VISible, unavailable on night). Updates each ½h.
Based on Costa Rica satellite images thanks to RAMMB and CIRA programs (Colorado State University).

* As the image time is Universal Time Coordinated or UTC (as before with GMT), subtract 6 h to get Costa Rica time.

Costa Rica
Location: 9°55'N 84°4'W (At the center of America, in the American Isthmus).
Subdivisions: Provinces: 7, Cantons: 81, Districts: 473
Area: 51,100 km² (19,730 sq mi) | Population: 4,563,539 (2010)

Main Climatic Subdivisions:
Rainfall Regions (Drainage Basins Systems):
     Pacific: Dry and rainy period well defined. The dry one is from December to April.
     Caribbean: Dry period is not well defined (less rainy months have 100-200 mm of rainfall.
Climatic Regions:
     Northern Pacific, Central Pacific, Southern Pacific, Central Region, Northern Zone, Northern Caribbean and Southern Caribbean



The only Official Information and Current Weather Reports in Costa Rica are from Instituto Meteorológico Nacional (National Weather Institute)
See its Current Weather and Forecast Report (In spanish, but is a graphically eloquent flash-animated map report):
Tuesday 17 October 2017 ☼ | ☼☁| ✧☽☁
Partly cloudy
This Tuesday in Costa Rica will continue the few rainfall due to the accelerated trade winds in the country, the humidity that generates afternoon rain remains near the Pacific coast, making rainfall difficult both in the Central Valley and in the north of the North Pacific. In the afternoon the sea breeze will increase the cloudiness in the regions of the Central Pacific and South Pacific with possibility of occasional rains. In the Caribbean and the North Zone, humidity from the Caribbean Sea, along with daytime warming, can cause scattered and brief rains in the plains.

Early Morning:
Central Valley: Partly Cloudy.
North Pacific: Partly Cloudy.
Central Pacific: Partly Cloudy.
South Pacific: Partly Cloudy.
North Caribbean: Partly Cloudy.
South Caribbean: Partly Cloudy.
North Zone: Partly Cloudy.

Morning:
Central Valley: Partly Cloudy.
North Pacific: Variable Cloudiness.
Central Pacific: Partly Cloudy.
South Pacific: Partly Cloudy to Cloudy.
North Caribbean: Variable Cloudiness.
South Caribbean: Variable Cloudiness.
North Zone: Partly Cloudy.

Afternoon:
Central Valley: Cloudy. Rainfall. Thunderstorms.
North Pacific: Partly Cloudy to Cloudy. Possible rainfall.
Central Pacific: Cloudy. Rainfall. Thunderstorms.
South Pacific: Cloudy. Rainfall. Thunderstorms.
North Caribbean: Partly Cloudy. Rain on mountains.
South Caribbean: Partly Cloudy. Rain on mountains.
North Zone: Partly Cloudy. Rainfall. Thunderstorms.

Night:
Central Valley: Partly Cloudy. Early isolated rain.
North Pacific: Partly Cloudy. Rain. Thunderstorms.
Central Pacific: Partly Cloudy. Rain. Thunderstorms.
South Pacific: Partly Cloudy. Isolated rain. Thunderstorms.
North Caribbean: Partly Cloudy.
South Caribbean: Partly Cloudy.
North Zone: Partly Cloudy. Isolated rain. Thunderstorms.

Temperatures (Max/Min ºC):

San José 27/17 | Alajuela 28/20 | Cartago 21/15 | Heredia 27/17 | Puntarenas 35/20 | Liberia 35/21 | Nicoya 31/22 | Bagaces 32/17 | Quepos 28/23 | Parrita 31/18 | Golfito 33/24 | Isla del Coco 26/19 | San Isidro de El General 23/22 | Guápiles 24/17 | Tortuguero 30/24 | Limón 29/25 | Sixaola 30/23 | Ciudad Quesada 30/18 | Upala 34/21 | Sarapiquí 28/22 |

Source: Juan Diego Naranjo (Meteorologist) - Instituto Meteorológico Nacional (IMN)

Costa Rica Weekly Weather Forecast (18 - 24 September 2017)

Instituto Meteorológico Nacional (IMN)

Partly cloudy | Wind | Rain at Caribbean and Northern Zone | Low Temperatures
 This week there will be typical conditions of the rainy season, predominating evaporation in the mornings, while the rains will be in the afternoon. In addition, the Convergence Zone will be active and close to the country, which will reinforce rainfall in the country.

Source: Instituto Meteorológico Nacional (IMN) - (Costa Rica National Weather Institute)

Costa Rica Weather in the month of February 2017

Monthly Weather Characterization from IMN

 February is characterized by dry conditions in the Central Valley and the Pacific, as well as a pattern of recurrent rains in the Caribbean and the Northern Zone. The dry season in the Pacific produces the Tropical Dry Forest) at the northern area.

Source: Instituto Meteorológico Nacional (IMN) - (Costa Rica National Weather Institute)

Current Oceanic Influence (17 October 2017)

From USA National Hurricane Center Advisories

Costa Rica Weather, General Description

 The seasons of Costa Rica climate are defined by the amount of rain that falls during a particular period of time. The year can be easily divided into two main periods or seasons, named by the local residents as "Verano", summer and "Invierno", winter. The "Verano" season is from December to April, and is the time of the year when there are more blue skies and few rains. The "Invierno" is the rainy period, from May to November, and during this time, in most locations, it rains constantly; with sunny mornings, sometimes cool, sometimes sweltering, and the rain coming during the first hours of afternoon.

The maximum rain quantity received is at the Northeastern lowlands, the Caribbean, near the Orosi Valley, Arenal and Monteverde areas, Talamanca Range, Osa Peninsula and Golfito (Southern Pacific) (annual rainfall of over 5,000 mm). Humidity is also higher on the Caribbean side than on the Pacific. The mean annual temperature on the coastal lowlands is around 80 °F (27 °C), 69 °F (21 °C) in the main populated areas of the Central Cordillera, and below 50 °F (10 °C) on the summits of the highest mountains. In the highest areas of Irazú Volcano (3,431 m) and Chirripó (3,810 m), temperatures sometimes can drop below 0 ºC during the end and beginning of the year.

The driest season of Costa Rica in most places is from December to April, while the rainy season is from May to November. On the Caribbean coast, however, December is by far the more wet month. The highlands areas are always cooler. The lowest elevation level in the country is the Pacific Ocean at sea level, the highest point is Cerro Chirripó, a somewhen glaciated mountain with an elevation of 3,810 m (part of Chirripó National Park). Even on a clear day, it is possible to see both the Caribbean Sea and the Pacific Ocean from the top.

Weather related Books

This is a selection of recommended and suggested books for further reading and learning about weather and climate; which are available for look at their reader reviews and buying online if needed (* As a form to support this website, we are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites).

Books about Weather, Meteorology and Climate
• Bedford, D. & Cook, J. (2016). Climate Change: Examining the Facts. ABC-CLIO.
• Dunlop, S. (2003). The Weather Identification Handbook: The Ultimate Guide for Weather Watchers. Lyons Press.
• Lutgens, F., Tarbuck, E. J., & Tasa, D., F. (2015). The Atmosphere: An Introduction to Meteorology (13th Ed.). Pearson Prentice Hall.
• Ruddiman, W. F. (2013). Earth's Climate: Past and Future. Freeman.