This week Costa Rica will experience a split weather pattern. On Monday and Tuesday we’ll see warm temperatures with afternoon cloud buildup and possible rain spells along the Pacific coast and within the Central Valley. This is because of atmospheric heating, sea breezes, and lingering moisture, which combine to produce showers and thunderstorms.
Starting Wednesday, a cold front moving through the Yucatán Peninsula will trigger accelerated trade winds across the Caribbean basin. These strengthened trade winds will shift rainfall away from the Pacific and Central Valley toward the Caribbean and Northern Zone, with Friday marking the driest day nationwide. For the weekend, moisture will increase the precipitation levels in the Caribbean.
The accelerated trade winds will create cooler conditions in the eastern and central Central Valley and mountainous areas, though this represents typical trade wind effects rather than the dramatic temperature drops we’ve seen from stronger northern systems.
Warm mornings transition to cloudy afternoons with rain and thunderstorms, primarily in Pacific regions. Trade winds begin strengthening slightly in northern Guanacaste by Tuesday.
Mornings: Mostly clear across the country with warming temperatures as the day progresses.
Afternoons: Rain and showers develop in the Pacific and Central Valley, heaviest in the Central and South Pacific with some thunderstorms. Western Central Valley and Nicoya Peninsula may see isolated events.
Nights: Mostly clear conditions return.
A new period of accelerated trade winds in the Caribbean basin brings cloudiness and light rain to the Caribbean and Northern Zone while drying conditions in the Pacific and Central Valley.
Mornings: Partly to mostly cloudy skies with rain on the Caribbean Slope and its borders with the Central Valley. Occasional wind gusts in mountains, Central Valley, and North Pacific. Partly to mostly cloudy in Pacific regions.
Afternoons: Partly to mostly cloudy with drizzle and isolated showers on the Caribbean Slope and Central Valley borders. Wind gusts continue in mountains, Central Valley, and North Pacific. Partly cloudy in Pacific regions.
Nights: Partly to mostly cloudy with rain on the Caribbean Slope and Central Valley borders. Occasional gusts in mountains, Central Valley, and North Pacific. Partly to mostly cloudy in Pacific regions.
The most stable, dry conditions of the week as trade wind patterns fully establish across the country.
The weekend brings increased rainfall to the Caribbean and Northern Zone with moderate precipitation and occasional stronger events. Cloudiness from the Caribbean reaches the Central Valley and mountainous areas of the Central and South Pacific, potentially bringing some rain or at least cloudy skies.
Central & South Pacific: Active Monday-Tuesday with afternoon thunderstorms. Drier conditions Wednesday through weekend, though weekend cloudiness from Caribbean may reach mountainous areas.
Central Valley: Afternoon rain possible Monday-Tuesday, mainly in western areas. Wednesday-Thursday sees cloudiness and drizzle near Caribbean borders. Cooler conditions develop, especially in eastern and central valley and mountains. Weekend cloudiness possible from Caribbean moisture.
North Pacific/Guanacaste: Trade winds begin strengthening Tuesday in northern areas. Moderate to strong winds in elevated areas Wednesday through weekend. Mostly dry conditions prevail.
Caribbean & Northern Zone: Light rain Wednesday-Thursday. Weekend brings moderate rainfall with some stronger events as moisture increases.
Wind Pattern: Trade winds accelerate Wednesday, maintaining moderate intensity with stronger gusts in elevated areas, particularly northern Guanacaste.
Temperatures show cooling influence in affected regions as trade winds strengthen. Central Valley lows drop to 12°C (53.6°F), creating noticeably chilly mornings and evenings, particularly in eastern and central areas where trade wind effects are strongest.
| Region | High °C (°F) | Low °C (°F) |
|---|---|---|
| Central Valley | 29° (84.2°) | 12° (53.6°) |
| North Pacific | 34° (93.2°) | 19° (66.2°) |
| Central Pacific | 32° (89.6°) | 14° (57.2°) |
| South Pacific | 33° (91.4°) | 14° (57.2°) |
| Caribbean | 31° (87.8°) | 15° (59°) |
| Northern Zone | 31° (87.8°) | 12° (53.6°) |
This forecast is based on outlooks from Costa Rica’s National Meteorological Institute (IMN) and other meteorological analysis from sources like Meteorología CR.
