San Juan Weather Forecast
Current Conditions & 10-Day Outlook
Current Weather Conditions in San Juan
San Juan
Alajuela Province, Costa Rica
OvercastHourly San Juan Weather Forecast
21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°21°Very gentle wind.
Moderate chance of precipitation.
San Juan 10-Day Weather Outlook
Meteorologia de hoje em San Juan, Alajuela Province, Costa Rica
Fri, Aug 14
Sat, Aug 15
Sun, Aug 16
Mon, Aug 17
Tue, Aug 18
Wed, Aug 19
Thu, Aug 20
Fri, Aug 21
Sat, Aug 22
Sensação térmica
Feels warmer than actual temperature.
Pressão
Expect unstable weather conditions.
Humidade
High humidity.
UV
Take precautions.
Rajadas
Velocidade máxima das rajadas de vento hoje.
Nebulosidade
Overcast, expect cloudy conditions.
Luz do dia
Long days, short nights.
Chuva
No rain, dry conditions expected.
Queda de neve
No snowfall expected.
Current Air Quality in San Juan
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About San Juan Weather
General
This page provides the current weather forecast for San Juan, Alajuela Province, Costa Rica, including hourly conditions, a 10-day outlook, wind speed and direction, precipitation, UV index, and air quality - giving you everything you need to plan your day in one view.
Forecast & Methodology
The forecast data on this page is sourced from the ECMWF open-source model - a reliable global model used widely across weather services worldwide. For sailors, boaters, and mariners who need greater accuracy and higher resolution, PredictWind's proprietary forecast models deliver precision down to 1km resolution, updated multiple times daily and validated against real-world observations. Sign up free to access PredictWind's advanced forecasts.
Sailing & Marine Conditions
San Juan weather forecasts on PredictWind are optimised for sailors and boaters who need precise, reliable wind and wave data for passage planning and day sailing. PredictWind is used by ocean racers, cruising sailors, and commercial vessel operators across Costa Rica and worldwide. For detailed marine conditions including wave height, swell period, and offshore wind forecasts, sign up free to access PredictWind's full marine forecast suite.
Units
Wind speed is displayed in knots - the standard unit used by sailors, weather services, and maritime authorities. Temperature is shown in degrees Celsius. Use the toggle at the top of the page to switch between Celsius and Fahrenheit. Pressure is shown in hPa, rainfall in millimetres, and air quality is available in both US and EU AQI standards.