Weather warnings
Aviso Meteorológico Informativo-IMN-080324-845 a.m.
Mar
08
Weather Warning
Extreme heat in the country continues this weekend
March 8, 2024
8.45 am
Diagnosis: The usually hot conditions of the month of March in our country are still present and, together with the absence of clouds and trade winds, as well as the presence of the El Niño phenomenon, continue to generate extreme maximum temperatures in Guanacaste and the Central Valley that have broken some records of the current month.
Forecast: Current analyzes indicate that these extreme heat conditions will continue into the weekend in the national territory. This Friday, we expect maximum temperatures close to 40°C during the day for the North Pacific, occasionally higher values could be recorded. While in the Central Valley the maximum temperature values close to 33°C will remain, especially in the west of the region. In the rest of the country, maximum temperatures between 33°C and 36°C are expected, the highest in the border sector with Panama and towards the plains of the northern border as well.
Starting Monday, we will have a decrease in extreme heat due to the increase in trade winds.
Due to the above, the IMN recommends:
• Stay hydrated regularly to avoid heat stroke.
• Use sunscreen at all times, avoiding exposure to solar radiation between 10 am and 2 pm.
• Information and recommendations on ultraviolet radiation index at: https://www.imn.ac.cr/indice-ultravioleta
• Map of current temperatures at: https://www.imn.ac.cr/web/imn/mapa
• Stay informed through social networks, Twitter: @IMNCR, Facebook: National Meteorological Institute CR and the WEB Page: www.imn.ac.cr
Weather warnings history
In this section you will find the weather warnings history.
Oct
25
Weather Warning
Downpours and storms this late afternoon and evening in the South Pacífic and coastal regions of Central Pacífic
October 25, 2026
10:45 a.m.
Diagnosis: Instability in the upper atmosphere, combined with a distinct transitional weather pattern, has led to the formation of a Convergence Zone south of the region (between Costa Rica...
Oct
21
Weather Warning
Downpours and storms in the center-south of the Pacific slope and isolated thundershowers in the Caribbean
October 21, 2026
10:30 a.m.
Diagnosis: The Intertropical Convergence Zone is positioned over our country this Wednesday. Additionally, Tropical Wave #52—located north of Panama in the western Caribbean Sea—is...
Oct
20
Weather Warning
Downpours with thunderstorms this Tuesday
20/10/2026
10:15 a.m.
Diagnosis: This Tuesday, high levels of atmospheric instability persist, linked to the activity of the Intertropical Convergence Zone and high moisture content over maritime areas. Combined with...
Oct
19
Weather Advisory
Favorable conditions for heavy downpours this afternoon
October 19, 2026
11:00 a.m
Diagnosis: This Monday, the continuous influx of moisture from both maritime regions, high temperatures, and the proximity of the Intertropical Convergence Zone—which brings atmospheric...
Oct
18
Aviso Meteorológico
Lluvias persistirían durante las primeras horas de la noche
18 de octubre de 2026
5 p.m.
Diagnóstico: Este domingo, el constante ingreso de humedad desde los sectores marítimos, en conjunto con las altas temperaturas registradas durante la mañana y la cercanía de la Zona de...
Oct
18
Weather Warning
Atmospheric conditions favorable for thunderstorms this afternoon
October 18, 2026
12 m
Diagnosis: This Sunday, the steady inflow of moisture from both maritime sectors, the high temperatures recorded during the morning, and the proximity of the Intertropical Convergence Zone—which...
Oct
16
Weather Warning
Unstable atmospheric conditions this Friday
16/10/2026
10:30 a.m.
Diagnosis: This Friday, an increase in atmospheric humidity—combined with daytime heating, sea and local breezes, and high atmospheric instability—will favor the occurrence of downpours of...
Oct
15
Weather Warning
Scattered, intense downpours this Thursday
15/10/2026
9:45 a.m.
Diagnosis: This Thursday, an increase in atmospheric humidity, combined with daytime heating and sea or local breezes, will favor the occurrence of scattered, intense downpours during the...
Oct
15
Aviso Meteorológico
Condiciones favorables para aguaceros dispersos pero intensos y tormentas eléctricas durante esta noche
14 de octubre del 2026
11:30 p.m.
Diagnóstico: Altos valores de humedad en conjunto con la Zona de Convergencia Intertropical son factores que facilitan la formación nubosa sobre el país, generando lluvias con tormenta eléctrica...
Oct
14
Aviso Meteorológico
Condiciones favorables para aguaceros dispersos pero intensos y tormentas eléctricas este miércoles
14 de octubre de 2026
11:00 a.m.
Diagnóstico: Este miércoles, se prevé una mayor inestabilidad atmosférica y disponibilidad de humedad durante el resto del día, debido a las altas temperaturas registradas en las últimas horas,...
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