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.
Aviso Meteorológico-IMN-090920-500pm
Sep
09
Weather Warning
Tropical wave # 36 will cross Costa Rica tonight
September 09, 2020
5 p.m.
Diagnosis: Tropical wave # 36 is located at the beginning of the night near the border between Costa Rica / Panama; therefore, she will be crossing the country in the course of tonight. The instability generated by this wave would be reinforcing the rains mainly at night in the regions of the Central Pacific and the South Pacific. Until this time, the accumulated amounts in these regions vary between 10-20mm and maximums of 50mm in the canton of Corridors.
Forecast: Tonight, moderate to strong rains are forecast, with estimated amounts between 10-20mm and maximum estimated between 30-40mm on a specific basis.
In the North Pacific, scattered showers will continue over the Nicoya Peninsula later this afternoon, with maximums of up to 30mm in the next 6 hours.
Both in the Central Valley and the North Zone, as there could be scattered showers with electrical storms, with amounts that do not exceed 10mm.
No significant rains are expected in the Caribbean regions during this period.
Warning: Caution near the coast of the Central Pacific and the South Pacific, mainly in the cantons of Osa, Golfito and Corredores in the next few hours.
Due to the above, the IMN recommends:
• Caution in areas vulnerable to flooding due to sewerage saturation.
• Take shelter in a safe place in case you hear 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
Juan Diego Naranjo Diaz
Meteorologist
DMSA-IMN
