San Isidro, Costa Rica - Weather and Climate
The weather in San Isidro, San José Province, Costa Rica, is characterized by a steady average temperature throughout the year.
It is also known for its heavy rainfall.
Now, let’s break down all the climate details for a clearer picture.
Average maximum day and minimum night temperature
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 in April to a comfortable 23°C in the coolest month, January.
Nights are cooler, with lows often dropping to around 16°C during the colder months.Check out our detailed temperature page for more information.
Temperature ranges by month
Precipitation and rainy days
San Isidro is known for its substantial rainfall, with annual precipitation reaching 5207 mm. The climate in San Isidro shows significant variation throughout the year. Expect heavy rainfall in October, with an average of 737 mm of precipitation over 23 rainy days.
In contrast, February offers drier and sunnier days, with around 104 mm 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 over the year
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
Average monthly humidity
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
Forecast for San Isidro
Select a Month of Interest
Check the conditions for any month of the year.
The best time of year to visit San Isidro in Costa Rica
Other facts from our historical weather data:April has an average maximum temperature of 25°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 23°C.
October tops the wettest month list with 737 mm of rainfall.
February is the driest month with 104 mm of precipitation.
March is the sunniest month with an average of 270 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
