Last updated: August 23, 2025
In August, the average temperature in San Isidro, Costa Rica is a pleasant 22°C (73°F), with minimums dipping to 19°C (67°F) and maximums reaching up to 26°C (78°F). Expect high humidity, averaging 82%, paired with a significant precipitation amount of 838 mm (33.0 in) over the month’s 31 days. This blend of warmth and moisture creates a unique atmosphere in this charming locale.
In August in San Isidro, the average temperature is 22°C (73°F). Maximums can reach 26°C (78°F), while minimums can drop as low as 19°C (67°F). This mild and pleasant weather makes it an ideal time for travelers to explore and enjoy outdoor activities.
In San Isidro in August, the total precipitation amount is 838 mm (33.0 in) over the course of 31 days.
In San Isidro in August, humidity is 82%. With an average temperature of 22°C (73°F), this humidity feels like a warm, heavy embrace, making traveling feel sticky and draining, but the tropical atmosphere also brings a lush vibrancy to the surroundings.
In San Isidro in August, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Isidro, you can check here.
UV Risk Categories
Weather in San Isidro varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in San Isidro, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 22°C (72°F) | 194 mm (7.6 inches) | 68% | extreme |
| February Weather | 22°C (73°F) | 99 mm (3.9 inches) | 68% | extreme |
| March Weather | 23°C (73°F) | 120 mm (4.7 inches) | 66% | extreme |
| April Weather | 23°C (73°F) | 350 mm (13.8 inches) | 67% | extreme |
| May Weather | 23°C (73°F) | 742 mm (29.2 inches) | 69% | extreme |
| June Weather | 23°C (73°F) | 663 mm (26.1 inches) | 84% | extreme |
| July Weather | 22°C (73°F) | 784 mm (30.8 inches) | 85% | extreme |
| August Weather | 22°C (73°F) | 838 mm (33.0 inches) | 82% | extreme |
| September Weather | 22°C (72°F) | 766 mm (30.1 inches) | 81% | extreme |
| October Weather | 22°C (72°F) | 937 mm (36.9 inches) | 80% | extreme |
| November Weather | 22°C (72°F) | 885 mm (34.8 inches) | 80% | extreme |
| December Weather | 22°C (72°F) | 354 mm (13.9 inches) | 72% | extreme |