Weather warnings

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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Jun

26

Weather Warning | Update

Rainfall activity of varying intensity this afternoon in the Pacific and Northern Zone

June 26, 2025
5:00 p.m.

Diagnostic: The passage of Tropical Wave #9, in combination with the Intertropical Convergence Zone, maintains atmospheric instability over the country. This has generated rain showers and...

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Weather warnings history

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Aviso Meteorológico-IMN-080924-1130am

Sep

08

Weather Warning

Rainy activity of variable intensity this afternoon and night

September 08, 2024
11.30 a.m.

Discussion: The Intertropical Convergence Zone remains active near the national territory, in addition to instability in the upper atmosphere; they create a very humid environment and ideal for the formation of cloudiness and the occurrence of rains of variable intensity during the afternoon and early evening.

Forecast: Rains of variable intensity and isolated showers with thunderstorms are expected during this afternoon and the first part of the night period, starting in the mountainous areas and progressively extending towards the lower areas of the Pacific, Northern Zone and Central Valley regions. For its part, in the Caribbean, the probability of precipitation will remain in the mountainous areas. Estimated accumulations between 40-80 mm, in periods of 6-12 hours, higher accumulations are possible in a localized manner. In addition, fog banks are possible at the beginning of the night in GAM and mountainous areas.

Warning: Soils remain highly saturated in the North Zone, South Pacific and Nicoya Peninsula, regions where rain will be frequent on this day; therefore, these areas are highly vulnerable. Also, the rains expected in urban areas may cause congestion in the sewer system and flash floods.

Due to the above, the IMN recommends:

  • Be careful due to sewer saturation in places prone to this type of flooding.
  • Prevention in the event of an electrical storm and seek shelter in a safe place in the event of strong gusts of wind occurring or perceived near the storm clouds, due to the possible fall of tree branches, power lines, among others. These gusts can reach 80 km/h in some isolated cases.
  • 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