San Isidro Weather & Climate: Best Time to Visit
With consistently stable weather, San Isidro, San José Province, Costa Rica, sees little seasonal temperature change. Daytime highs average 24°C (75°F), ranging from 25°C (77°F) in April to 23°C (73°F) in January.
The city receives considerable rainfall, with around 5207 mm (205 in) annually. October is the wettest month. The sunniest month is January, with 9.0 hours of sunshine per day on average.
Monthly Temperature in San Isidro
The climate in San Isidro remains fairly constant, offering comfortable temperatures throughout the year. Typically, average maximum daytime temperatures range from a comfortable 25°C (77°F) in April to a comfortable 23°C (73°F) in the coolest month, January.
Nights vary from 18°C (64°F) in April to around 16°C (61°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in San Isidro
San Isidro is known for its substantial rainfall, with annual precipitation reaching 5207 mm (205 in). The climate in San Isidro shows significant variation throughout the year. Expect heavy rainfall in October, the wettest month, with an average of 737 mm (29 in) of precipitation over 23 rainy days.
In contrast, the driest month February offers drier and sunnier days, with around 104 mm (4.1 in) of rainfall over 9 rainy days. For more details, please visit our San Isidro Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in San Isidro
For those who appreciate different seasons, San Isidro serves as an ideal destination. Expect longer, more sun-filled days in January with an average of 9.0 hours of sunshine daily, and embrace the darker days in June, offering only 4.9 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in San Isidro by Month
The city experiences its highest humidity in June, reaching 83%. In April, the humidity drops to its lowest level at 79%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
San Isidro 3-Day Forecast
Check the conditions for any month of the year.
Best Time to Visit San Isidro
During January, February and March, San Isidro experiences its most favorable weather, with temperatures between 24°C (75°F) and 25°C (76°F). These mild conditions make it an excellent time for a visit.The weather does bring rainfall during this period, between 104 mm (4.1 in) and 124 mm (4.9 in). Planning your next adventure but unsure where to go? Our climate tool suggests perfect locations tailored to your preferred weather conditions. Discover your ideal travel destination with our weather planner.
