Weather warnings

Jul

06

Aviso Meteorológico

Efectos de la onda tropical #13 en el país este domingo y lunes

06 de julio de 2025
11.25 am

Diagnóstico: La onda tropical #13 se localiza este domingo al oeste de Panamá, generando inestabilidad en el mar Caribe frente a la costa costarricense, lo que favorece lluvias en el Caribe Sur...

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Jul

01

Weather Warning

Rainy conditions in the Caribbean and Northern Zone this Tuesday and Tropical Wave #12

Jul 01th, 2025
10 am

Diagnosis The strengthening of the trade winds over the central and northern regions of the country has produced wind gusts of up to 50 km/h in areas such as Alajuela this morning. This...

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Jun

28

Weather Warning

Tropical Wave #10 over Costa Rica

June 28th, 2025
10:30 a.m.

Diagnosis: Tropical wave #10 is over the country this Saturday, causing instability in maritime areas of the Caribbean and northern parts of the Northern Zone. There has been increasing...

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Jun

27

Weather Warning -Update-

Rainy Afternoon in Costa Rica

June 27th, 2025
05.40 p.m.

Forecast: After the passage of Tropical Wave 9 yesterday, Thursday, the atmosphere remains unstable over the country. Along with warm morning temperatures and high humidity from recent rains,...

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Jun

27

Weather Warning

Tarde lluviosa en Costa Rica

June 27th, 2025
10:00 am

Diagnosis: After the passage of tropical wave #9 on Thursday, the atmosphere continues to be unstable over the country, which, together with the warm temperatures of this morning and the high...

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Aviso Meteorológico-IMN-011224-1115am

Dec

01

Weather Warning

Influence of cold surge #3 in Costa Rica

December 01, 2024
11.15 a.m.

Discussion: Cold surge #3 has generated a gradual increase in atmospheric pressure in the Caribbean Basin and Central America and with it a gradual increase in the intensity of the winds in the country is experienced. Tomorrow, gusts ranging between 35-50 km/h are perceived in the north and east of the Central Valley; in the north of Guanacaste and the mountain ranges, maximums of up to 65 km/h in the north of Guanacaste. The projection of humidity due to wind drag favors cloud cover and rainy events in the Caribbean and the North Zone and occasionally extends towards the Central Valley generating accumulations between 15-50 mm in the last 6 hours.

Forecast: On Sunday, rains of varying intensity will continue in the North Zone and the Caribbean, with greater recurrence during Sunday night and early Monday morning, with amounts between 30-70 mm estimated in periods of 6-12 hours. Cloudiness will occasionally extend to the Central Valley and also to the North of Guanacaste, causing light rain and drizzle; accumulated between 5-15 mm in periods of 6-12 hours. In the South Pacific and the coasts of the Central Pacific, scattered showers are expected during the afternoon, with amounts varying between 10 and 35 mm in periods of 6 to 12 hours.

Regarding the winds, an increase in the frequency of gusts is anticipated in the North Pacific, the Central Valley and the mountain ranges. Speeds will range between 30 and 65 km/h in the lower areas, while in higher altitude areas, ranges between 70 and 90 km/h are expected, with greater accentuation starting on Monday.

The influence of cold surge #3 will extend into next week. A progressive increase in rainfall is expected in the Caribbean region and the North Zone from this Sunday to Wednesday; as well as in the intensity of the winds in the north and center of the national territory.


Warning: Special attention should be paid to mountainous areas of the Caribbean, Northern Zone and South Pacific, as the basins have saturation levels between 85% and 95%. Therefore, they are highly vulnerable to incidents.

Due to the above, the IMN recommends:

  • Caution due to sewer saturation in places prone to this type of flooding, as well as increased flow in rivers and streams.
  • Prevention due to gusts of wind and their possible damage to roofs, electrical wiring, signs, trees; as well as in the mountainous parts of the country and Guanacaste (national parks, volcanoes).
  • Caution in air navigation due to increased turbulence, as well as in maritime navigation due to increased rough seas, especially in the North Pacific, Gulf of Nicoya and northern Central Pacific.
  • Avoid fires of all kinds, as they can get out of control. Stay informed through social media: Twitter: @IMNCR, Facebook: Instituto Meteorológico Nacional CR and the WEBSITE: www.imn.ac.cr

Rebeca Morera R./Meteorologist/DMSA-IMN