The first few days of this week will be pretty active in terms of rainfall across the country. Nighttime and morning rains are forecast for the Caribbean and Northern Zone, as well as afternoon precipitation in the Pacific and Central Valley.
Starting Friday, a decrease in humidity is expected, which will increase temperatures and give us overall less rainfall. This represents another shift in the evolving weather patterns we’ve been tracking.
We’re tracking two tropical waves this week: Tropical Wave #19 will cross the country beginning early Tuesday morning, while Tropical Wave #20 will follow on Thursday. These systems will contribute to the active early-week weather/instability before conditions begin to settle.
Monday-Thursday’s active period: The most rainfall activity for the week, with both nighttime/morning rains in the Caribbean and Northern Zone, plus afternoon storms in Pacific and Central Valley regions. Thursday’s tropical wave provides one more round of enhanced rainfall potential across most regions.
Friday onward drying trend: Starting Friday, humidity decreases, temperatures rise, and rainfall becomes more scattered as drier air moves in.
Light to partly cloudy conditions in the North Pacific and Central Valley provide pleasant starts to the day early in the week. Possible showers in Limón and the northern region will be more frequent during the active period. The Central and South Pacific will see partly cloudy conditions.
Guanacaste will experience scattered showers during the active period. The Central Valley will range from partly cloudy to cloudy with variable showers and thunderstorms. The Caribbean and Northern Region will have partly to mostly cloudy conditions, with a greater presence of rain in the mountain ranges.
The Central and South Pacific will have showers and thunderstorms in the mountains during early afternoons, then spreading to the coast in the late afternoon.
Partly to mostly cloudy conditions in the North Pacific and Central Valley. Possible showers in Limón and the northern region will continue into evening hours during the active period. The Central and South Pacific will see partly to mostly cloudy conditions with showers on the coast.
Central Valley & North Pacific: Will experience the most noticeable change this week, starting with increased afternoon storm activity early in the week, then transitioning to drier, warmer conditions by Friday.
Caribbean & Northern Zone: These areas maintain more consistent rainfall patterns with nighttime and morning activity throughout the week, though intensity will decrease as humidity drops later in the week.
Central & South Pacific: Should continue their classic afternoon thunderstorm pattern, but expect enhanced activity during the early part of the week before things settle down.
Temperature patterns will shift this week, starting comfortable during the active period, then warming up as humidity decreases and drier air moves in by Friday.
Here’s what we are looking at for high and low temperatures across Costa Rica’s different regions:
High: 30° (86°) | Low: 13° (55.4°)
High: 35° (95°) | Low: 19° (66.2°)
High: 32° (89.6°) | Low: 14° (57.2°)
High: 32° (89.6°) | Low: 16° (60.8°)
High: 31° (87.8°) | Low: 18° (64.4°)
High: 33° (91.4°) | Low: 18° (64.4°)
This forecast is based on the weekly outlook shared by Costa Rica’s National Meteorological Institute (IMN).
