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Current Storms in Costa Rica

current storms | forecasts to avoid | best time to visit | useful forecasts | historical storms

After an exceptionally active and long hurricane season NOAA predicts that precipitation will be normal for the first half of 2021 in Costa Rica.  That means very dry on the Pacific side until May.

The Papagayo winds that began in mid-December typically continue with gusts up to 100 kph in the central valley and up to 120 kph in Guancaste and the north through January.

Typical afternoon and overnight rains on the Caribbean side mix with a few daytime showers in the “tropical” weather pattern that prevails there every month except September and October.

NOAA-tropical-weather-prediction-20191220
Precipitation prediction map for Costa Rica in the first part of 2021 – The tropical storms and cyclones seasons are over in both oceans but lingering low pressure systems may bring a bit more rainfall in the northern Caribbean.

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Costa Rica Weather Forecasts You Should Ignore

There are thousands of websites out there with links and embedded forecasts from weather servers and they’re all wrong. (skip to Useful Costa Rica Weather Forecasts)

Weather forecasts for Costa Rica are predictably monotonous
Weather forecasts for Costa Rica are predictably monotonous even in the middle of the dry season (like the cloud and rain prediction shown above from March)

Well sort of wrong anyway.  If what you’re trying to find out is “what will the weather be like next week when I visit,” then a forecast that’s unvarying – saying “chance of rain” for 15 days in a row – is pretty useless and will definitely give the wrong impression.

It’s the tropics, there’s always a “chance of rain.”

Weather.com and other sites serve weather maps based on current conditions and readings from a few automated weather sensing stations around the country.  Unfortunately based on that limited data except in the driest months in the driest regions the forecast is nearly always some rain.

I can’t count the number of times I’ve gotten phone calls from panicked travelers asking if they should cancel their trip because “there’s an 80% chance of rain every day.”

Then I have to explain that “Costa Rica is a country of micro-climates but those forecasts are for huge areas and for 24 hour periods,” and continue to explain that “it rains somewhere in Costa Rica every day (or night).”

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USEFUL Weather Forecasts for Costa Rica

The best “at a glance” prediction comes from the U.S. National Oceanic and Atmospheric Administration (NOAA) weather service Global Tropics Climate Prediction Center which updates a simple wetter/drier, warmer/cooler map every week.

Costa Rica Cyclones and Hurricanes

During hurricane season (June 1 through November 30) the U.S. National Weather Service and NOAA (National Oceanic and Atmospheric Administration) do an excellent job of observing, tracking and predicting the paths of low pressure systems, tropical storms and hurricanes as they develop.

NWS NOAA Costa Rica Storms
A typical map from NOAA showing a low pressure system with a 40-60% chance of organizing into a tropical storm in the next two days

In storm season the “Tropical Weather Outlook” webpage is updated with a new map, probabilities and projected movements every day at 2 am, 8 am, 2 pm, and 8 pm eastern time.

This is basically all the information used by weather website, television and newspaper meteorologists.  They add a few seconds of video of a reporter leaning into the wind with their jacket whipping and palm trees bending in the background but if you want the very latest information straight form the source this is where to get it.

National Emergency Alert System

The best source for weather related alerts from within Costa Rica is the Instituto Meteorológico Nacional web page where they also have an RSS feed version link.

The Comisión Nacional de Prevención de Riesgos y Atención de Emergencias – Costa Rican emergency alert system used to provide good information for ongoing weather related disasters.  In May of 2019 they introduced their fancy new website with a separate listing for current alerts but unfortunately a year later it’s still broken.  They also announced a phone app but it doesn’t appear to have any data feed.

Hour by Hour Predictions & Weather Conditions

The best simplified weather forecast we’ve found for Costa Rica, and the one to use in the dry season (when the NOAA/NWS hurricane page is not updating because there are no hurricanes from December through May) is the ten day hourly forecast on Weather Underground.

Costa Rica Ten Day Weather Forecast
A typical ten day weather forecast for Costa Rica. Note the blue bumps every day in the precipitation chart when the afternoon showers start!

We’ve found these reports quite reliable in the U.S. and Europe but they’ve only recently expanded to Costa Rica so we’ve only tested in a few of places a few times.  They seem pretty good as long as you’re aware of the limitations.

Below are links to regional forecasts.

San José and the Central Valley Region
Liberia, Guanacaste and the Nicoya Peninsula
Palmar Sur, Central Pacific and Northern Osa Peninsula
Osa Peninsula, Golfito, Burica and North Pacific Panama
Tortuguero, Barra Del Colorado and Southeast Nicaragua
Limón, Tortuguero and Caribbean
Caribbean, Puerto Viejo, Manzanillo, and Northern Panama

Some locales are listed twice and linked to two different stations because they are in between and checking both reports may be helpful.

Deceptions? & Limitations Alert

Costa Rica is a land of micro climates and the weather can vary dramatically in locations just a few miles apart.

If you click “change station” on the recommended ten day forecasts above weather underground shows you a map with over a hundred station location options for Costa Rica.  If you click on different locations it looks at first glance like there is a detailed report and prediction for each.  However, if you look closely you’ll see it’s actually the identical predicted precipitation patterns, temperature profiles and wind speed cloned from the main stations and displayed on each local station.

In other words, it looks like there are very detailed micro forecasts but there are not.  The local data (current and historical temp, wind etc.) is from an automated station located exactly where the dot is shown on the map but the forecast may not be.

I don’t think they are intentionally misleading – this is the best forecast they have for each of the little stations – but don’t be fooled into thinking that they collected and interpreted data then made a forecast specific to the microclimate your lodge is located in.  Be aware that if the main station is 20 miles away across the continental divide the upcoming weather could be utterly unrelated to what is displayed!

best time to visit | current storms | forecasts to avoid | useful forecasts | historical storms

Combining it all to Make Your Own Forecast

If you want a better idea of what sort of rainfall and sunshine patterns you can expect you’re better off making your own forecast.  I’ve always thought this was true and a while back it was confirmed by a couple of friends who own rafting companies.  Their livelihoods depend on making a call every day that the rivers won’t be dangerously high from excessive rain.  They both arrived independently at the same technique that I use.

 

Tropical storms and Hurricanes Costa Rica Map
The Weather Underground website has a great live interactive mapping tool – this is an example where we’ve chosen to overlay the IR cloud cover with tropical depression and hurricane tracking for the region around Costa Rica.

Okay so every weather forecast is a bit iffy but you can certainly do a better job than the little prediction pop-ups on the weather websites – at least for Costa Rica where they work with very limited information.

First you need a general knowledge of Costa Rica’s seasons and weather patterns.  That’s available on the handy drop down menu below (just select the month you are traveling for a summary).

Second you need some information on what is brewing off the Pacific and Caribbean coasts (or has already brewed and is landing).  That’s available by clicking on either the tropical storm map that we’ve set criteria for (click image above) or more in depth analysis at NOAA (click image below).

Third you combine the two to figure out that since you’re traveling in February and the Guanacaste beach resorts are bone dry then and since the map isn’t showing any huge rainy low pressure systems tracking towards Costa Rica you’re good to go!  No need to call Ray and Sue!

You don’t really care that there’s an 80% chance of it raining somewhere in the country (probably on the southern Caribbean or high in the Talamanca mountains).

Of course if there is a huge hurricane bearing down in the Gulf of Mexico or a giant tropical depression trying to collect itself off the Pacific coast you may want to get out your umbrella.

NOAA Tropical Storm Map for Costa Rica
NOAA maintains an excellent weather website with info on the latest storms.

Many travel websites have what looks like very detailed information for very specific parts of Costa Rica but they’re just putting different labels on the same info to try to make it look specific.  There are really only two fully, reliably and continuously functional METAR feed stations in Costa Rica (at SJO and LIR airports) with a dozen others that send very limited data.

There’s no big network of ground based Doppler Radar which is where a lot of the specifics in U.S., European and Canadian weather forecast come from.

So check out the monthly climate pattern, check out the hurricane and tropical storm map, and then relax!

forecasts to avoid | useful forecasts | current storms | historical storms

Recent Significant Storms

Below are the alerts and reports for some recent weather disasters in Costa Rica as they happened.  There’s also a comprehensive list of History of Natural Disasters in Costa Rica

November 2020 – Hurricanes Theta and Iota

2020 was a record setting year for hurricanes.  There were so many they ran out of names starting with the 26 letters of the alphabet and had to resort to the backup of naming storms after Greek letters.  The final two storms of the season clobbered Nicaragua, Guatemala and Honduras but didn’t hit Costa Rica directly.  The low pressure associated with the storms dragged warm moist air from the Pacific towards the Caribbean causing torrential rainfall and flooding reminiscent of Otto in 2016.

October 2017 – Tropical Storm Nate

Tropical Storm/Hurricane Nate Note: The eye of the storm was several hundred kilometers to the north of Costa Rica but the airflow patterns created by Nate caused major rainfall and flooding October 5, 2017 (See current road, travel and weather status).  The recent Western Caribbean Disturbance 93L seems to be heading north without organizing into a Tropical Storm or causing significant damage (October 27, 2017).

Tropical storm Nate formed in the Caribbean east and north of Costa Rica and never made landfall there but the wind patterns drew warm moist air from the Pacific across the country causing intense rains on the west coast and in the mountains.

Typical Costa Rica rainfall tropical depression
Typical rainfall pattern when warm moist air from the Pacific is pulled across Costa Rica from west to east by a rotating low pressure system in the Caribbean (a tropical storm or hurricane).

November 2016 – Tropical Storm (Hurricane) Otto

Tropical storm Otto is moving towards Costa Rica from the Caribbean (see current map).  It is predicted to briefly reach Hurricane strength (Category 1 – the weakest Hurricane) around the time it makes landfall later today.

Hurricane Otto Animation
Hurricane Otto Animation 11/24/17 10:15 am
Troppical storm Otto in the Caribbean develops into Hurricane Otto over Costa Rica
Tropical storm Otto is tracking west towards Costa Rica and is expected to strengthen to Hurricane Otto before making landfall

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Other General Weather and Predictions

The U.S. NOAA and National Weather Service Climate Prediction Center was spot on predicting low pressure systems and tropical storm Alvin would lead to higher than normal rainfall across Costa Rica through the first half of July 2019.  While there was no dramatic flooding there were consistently more thunderstorms and rain across most of the country.

Costa Rica weather prediction map 20190625
NOAA tropical weather prediction for the first half of July 2019 shows it will be wetter than average.

Costa Rica tropical storm map July 2019

The U.S. National Oceanic and Atmospheric Administration (NOAA) weather service predicts with “high confidence” that 2019 daily rainfall across most of Costa Rica will be normal compared to historical averages for January and February.

NOAA-tropical-weather-prediction-20190104
No variation from normal is predicted for early 2019. Should be sunny, hot and dry on the Pacific side and tropical on the Caribbean as dry season kicks off.

Despite a mild El Niño (sometimes causes drought on Costa Rica’s Pacific side) there no variations from normal dry season weather predicted.

NOAA tropical weather prediction 20181123
NOAA predicted two different patterns of variation from the normal rainfall in Costa Rica for late November and into mid December 2018.  Most of the country is expected to be drier than normal (yellow) but the far south Pacific will be wetter (green band). It’s still the rainy season so expect daily tropical rains across Costa Rica with increasing winds beginning to blow out the clouds.

Don’t make the mistake of assuming that “drier” is the same as dry.  December is still a rainy season month and although there will probably be less rain than average but that can still be pretty wet.

NOAA tropical weather prediction 2018 November
NOAA predicted (correctly) with a moderate degree of confidence it would be drier in the region (yellow stripes) compared to average rainfall for November 2018.

 

NOAA tropical weather prediction 20181024
NOAA (correctly) predicted with a high degree of confidence that the end of October would be wetter than normal in Costa Rica (the green zone).

 

Tuesday October 23, 2018 – one small low pressure system far out in the Atlantic with only a 20% chance of organizing into a storm… Should stay relatively sunny (for the middle of rainy season) through the remainder of October.

October 2018 got a fast start as the rainiest month of the year in Costa Rica collecting huge rainfall totals in the first two weeks.

hurricane tropical storm map
Last week’s system organized into hurricane Michael and headed north to land fall in Florida and was replaced by a new tropical low pressure system (shown in orange). The heavy rains and flooding on the Pacific side were caused indirectly by a low pressure system on the Atlantic side in much the same manner as last year’s devastating Tropical Storm Nate.
Costa RIca Hurricane and tropical storm map October 2018
The large tropical low pressure system is pulling warm wet air across Costa Rica and causing heavy rainfall on the Pacific (especially Nicoya) and in the central mountains.  It’s somewhat drier for the lucky travelers who headed to the southern Caribbean which is typically sunnier in September and October. The low pressure system marked in red may intensify in the next few days.
Hurricane Florence and Tropical Storm Isaac faded out at the end of September after causing rain, flight delays/cancellations at U.S. airports but Costa Rica stayed out of the storm path.

Ray & Sue

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