Last updated: August 23, 2025
In June, the average temperature in San Juan, Costa Rica is a pleasant 21°C (70°F), with lows of around 16°C (60°F) and highs reaching up to 27°C (81°F). However, visitors should be prepared for some rain, as 351 mm (13.8 in) of precipitation can occur over 27 days. The average humidity sits at a comfortable 84%, making it essential to stay hydrated while enjoying the sights!
In June in San Juan, the average temperature is 21°C (70°F), with a maximum reaching 27°C (81°F) and a minimum dropping as low as 16°C (60°F). This pleasant climate makes San Juan an ideal destination for outdoor activities and sightseeing during this time of year.
In San Juan in June, the precipitation amount is 351 mm (13.8 in) over a period of 27 days.
In San Juan in June, humidity is 84%. With an average temperature of 21°C (70°F), this humidity feels like thick, warm air wrapping around you, making outdoor activities quite uncomfortable and necessitating frequent hydration breaks for a more enjoyable travel experience.
In San Juan in June, 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 Juan, you can check here.
UV Risk Categories
Weather in San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares June’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 20°C (68°F) | 32 mm (1.3 inches) | 68% | extreme |
| February Weather | 20°C (69°F) | 13 mm (0.5 inches) | 68% | extreme |
| March Weather | 21°C (70°F) | 15 mm (0.6 inches) | 66% | extreme |
| April Weather | 21°C (70°F) | 79 mm (3.1 inches) | 67% | extreme |
| May Weather | 21°C (70°F) | 391 mm (15.4 inches) | 69% | extreme |
| June Weather | 21°C (70°F) | 351 mm (13.8 inches) | 84% | extreme |
| July Weather | 21°C (69°F) | 233 mm (9.2 inches) | 85% | extreme |
| August Weather | 20°C (69°F) | 331 mm (13.0 inches) | 82% | extreme |
| September Weather | 20°C (69°F) | 436 mm (17.2 inches) | 81% | extreme |
| October Weather | 20°C (68°F) | 570 mm (22.4 inches) | 80% | extreme |
| November Weather | 20°C (68°F) | 209 mm (8.2 inches) | 80% | extreme |
| December Weather | 20°C (68°F) | 63 mm (2.5 inches) | 72% | very high |