Let’s first preface this forecast by saying that even with the recent wet weather we have been experiencing, there have still been some amazingly beautiful days to enjoy. Remember as you read that the increased rains are usually in the afternoons and at night. This week we could see a little more morning activity, but it should be temporary. Get out and enjoy! And remember an umbrella!
Costa Rica is entering another unstable weather pattern this week, driven by several converging meteorological factors. The Intertropical Convergence Zone (ITCZ) will remain very active, while Tropical Wave #5 is expected to pass through tomorrow (Friday). Combine that with high atmospheric humidity levels and a low-pressure system that is anticipated to strengthen near the country over the Pacific Ocean during the weekend.
This weather setup will generate a moist airflow from the west, bringing increased cloudiness, noticeably cooler temperatures, and variable rainfall across different regions. What’s different this week is that rainfall will begin in a scattered pattern during the mornings, especially in coastal areas, rather than the typical clear morning starts we’re used to.
The Pacific regions are expected to be most affected by these conditions, with afternoon downpours accompanied by thunderstorms likely across the Pacific, Central Valley, Caribbean mountains, and Northern Zone. Some precipitation may extend into the nighttime period, particularly in Pacific coastal areas and mountainous sections of the Central Valley.
An interesting thing happening this week: occasional fog banks are anticipated to form in the Greater Metropolitan Area (GAM), which could affect morning flights and commutes.
Expect partly to mostly cloudy skies with scattered showers, mainly affecting coastal areas. Temperatures will be cooler than average – a welcome relief from recent heat. The fog banks possible in the Central Valley may impact visibility for drivers and the SJO airport.
Partly to mostly cloudy conditions will dominate with variable rainfall chances across most of the country. The Pacific slope, Central Valley, and mountainous areas of the Caribbean and Northern Zone should prepare for isolated downpours. Fog banks could also form in the Central Valley during afternoon hours.
Partly to mostly cloudy skies will cover the entire country. Mountainous areas of the Central Valley and Pacific coastal regions can expect scattered showers and downpours during the early evening hours. The Caribbean may see occasional rainfall, while fog banks could develop again in the Central Valley.
Notice the cooler daytime temperatures in the Central and South Pacific regions – a result of increased cloud cover and the low-pressure system’s influence. These cooler temperatures could make outdoor activities more comfortable, even with the increased rainfall chances.
High: 34° (93.2°) | Low: 15° (59°)
High: 36° (96.8°) | Low: 19° (66.2°)
High: 30° (86°) | Low: 14° (57.2°)
High: 30° (86°) | Low: 16° (60.8°)
High: 32° (89.6°) | Low: 18° (64.4°)
High: 32° (89.6°) | Low: 18° (64.4°)
The silver lining: Cooler temperatures throughout the week will make outdoor activities more comfortable. It’s been hot and sticky lately!
Best strategies for different regions:
Central Valley: The fog banks could create some stunning photographic opportunities in the mornings, though drivers should allow extra time for commutes. Afternoon and evening showers are likely, so plan indoor activities or covered outdoor venues for later in the day.
Caribbean & Northern Zone: These areas will see the most predictible conditions, with typical rainy season patterns. Mountain areas may experience more rainfall, but lowland and coastal areas remain good options for activities.
Pacific Regions: While these areas are expected to be most affected, the cooler temperatures could make walks or hikes more pleasant during clear periods. Morning coastal showers are possible, so mid-day beach visits might work better.
Weekend Focus: With the low-pressure system strengthening over the Pacific during the weekend, Saturday and Sunday may see the most significant weather impacts. Consider planning major outdoor activities for earlier in the week.
This forecast is based on the weekly outlook shared by Costa Rica’s National Meteorological Institute (IMN).
