San Isidro Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit San Isidro.
Climate overview of San Isidro
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 November.
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.
San Isidro Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Isidro - and find the best time to visit.
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, November.
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
Best Time to Visit San Isidro
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, February and March
- Warmest weather: all year round
- Most sunshine: January, February and March
- Fewest rainy days: February, March and April
Frequently asked questions about the climate in San Isidro
What is the best time to visit San Isidro?
January, February and March typically offer the most optimal weather in San Isidro. In contrast, May, June, July, August, September, October and November tend to have less optimal conditions.
What temperatures can I expect in San Isidro?
Daytime highs range from 23°C (73°F) in November to 25°C (77°F) in April. Nighttime lows range from 16°C (61°F) to 18°C (64°F). Temperatures stay relatively stable year-round.
How much rain does San Isidro get?
Annual rainfall is around 5207 mm (205 in). October is the wettest month with 737 mm (29 in), while February is the driest with 104 mm (4.1 in).
How sunny is San Isidro?
San Isidro receives around 2,412 hours of sunshine per year. January is the sunniest month with 270 hours, while June is the cloudiest with just 148 hours. Overall, San Isidro enjoys abundant sunshine.
San Isidro 3-Day Forecast
San Isidro on the map
San Isidro is highlighted - select any city to see its climate.
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