Weather warnings
Jul
10
Weather Warning
Tropical Wave 14 to Pass Over Costa Rica This Friday
July 10, 2025
04.30 p.m.
Discussion: A change in the weather pattern toward more humid and unstable atmospheric conditions over Costa Rica and surrounding areas will increase the occurrence of rainfall in various parts...
Jul
08
Informative Weather Notice
Sahara dust over the country
July 08th, 2025
9:50 a.m.
Diagnosis: Increases in atmospheric pressure in the Caribbean Sea accelerate the trade winds over the basin, as well as over central and northern Spain. Furthermore, a dry, stable air mass...
Jul
07
Weather Warning
Heavy downpours during the afternoon in the Pacific and northern regions
July 07th, 2025
10.40 a.m.
Discussion: Tropical Wave 13 is located in western Costa Rica, close to entering the Pacific Ocean. Although it is a weak wave, its interaction with the Intertropical Convergence Zone increases...
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...
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...
Weather warnings history
In this section you will find the weather warnings history.
Meteorological Warning-IMN-070920-Tropical wave # 35 continues its passage over Costa Rica this Monday
Sep
07
Weather Warning Update
Tropical wave # 35 continues its passage over Costa Rica this Monday
September 7, 2020
2:45 p.m.
Diagnosis: Since the morning, the contribution of humidity from the Pacific due to the Intertropical Convergence Zone which is located over Costa Rica, together with atmospheric instability caused by the passage of tropical wave # 35 and morning evaporation in the country, have generated downpours with an electrical storm this afternoon in much of the national territory. So far, amounts between 10-25mm have been recorded in the South Pacific; in the North Pacific 10-20mm, and in the Central Valley 10-40mm.
Forecast: In the remainder of the afternoon and the night period, it is expected that the rainfall in the Central Valley will remain intermittent with estimated amounts between 20-35mm and possible maximums of 40mm. On the Pacific slope, it is anticipated that rainfall will be scattered with a possible electrical storm with amounts between 35-50mm and possible very specific maximums of 60mm
In addition, in the Caribbean and North Zone regions, partial cloudiness is expected with localized rains that reach amounts of 15-30mm.
Warning: Be very cautious around the Río Cañas in the North Pacific, South Pacific and mountains of the Central Valley and the Caribbean due to possible small landslides and floods of both rivers and streams.
Due to the above, the IMN recommends:
- Caution in areas vulnerable to flooding due to sewer saturation.
- Take shelter in a safe place in case of hearing an electrical storm or perceive strong gusts of wind near the storm clouds, as well as caution against possible falling tree branches, power lines, among others.
- Stay informed through social networks, Twitter: @IMNCR, Facebook: Instituto Meteorológico Nacional CR and the WEB Page: www.imn.ac.cr
Daniel Chacon Fernandez
Meteorologist
DMSA-IMN
