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June Weather in San Marcos, Costa Rica

Last updated: August 23, 2025

In San Marcos, Costa Rica, the average temperature in June hovers around 18°C (66°F), with a range between a cool 14°C (57°F) and a warm 25°C (76°F). Expect considerable rain, with 399 mm (15.7 in) of precipitation spread over 29 days, contributing to an average humidity of 84%.

June Temperature in San Marcos

In June in San Marcos, the average temperature is 18°C (66°F). The maximum can reach 25°C (76°F), and the minimum can be as low as 14°C (57°F). This climate makes it an ideal destination for travelers seeking mild and pleasant weather.

June Weather in San Marcos: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, June typically has an average temperature of 18°C (66°F), with highs reaching up to 25°C (76°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec636464656565656564646463
Data source: Temperature data for San Marcos generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

June Precipitation in San Marcos

In San Marcos in June, the total precipitation amount is 399 mm (15.7 in) spread over 29 days.

June Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In San Marcos, June typically receives around 399 mm (15.7 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec35192815553239931540350860127278
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in San Marcos

In San Marcos in June humidity is 84%. With an average temperature of 18°C (66°F), this humidity feels like a warm wrap around your skin, making even short excursions feel heavy and sticky, requiring frequent breaks for hydration and relief from the muggy atmosphere.

June Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in San Marcos is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec68%68%66%67%69%84%85%82%81%80%80%73%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in San Marcos

In San Marcos 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 Marcos, you can check here.

Maximum UV Index Levels in San Marcos for June

The chart shows the monthly maximum UV Index (UVI) for San Marcos in June, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In June, the maximum UV index in San Marcos typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121415161514151414141211
Data source: San Marcos June UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How June Weather in San Marcos Compares to Other Months

Weather in San Marcos varies notably across the year, with each month offering distinct climate conditions. This page compares June’s weather to other months in San Marcos, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Marcos, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)35 mm (1.4 inches)68%extreme
February Weather18°C (64°F)19 mm (0.8 inches)68%extreme
March Weather18°C (65°F)28 mm (1.1 inches)66%extreme
April Weather18°C (65°F)155 mm (6.1 inches)67%extreme
May Weather18°C (65°F)532 mm (21.0 inches)69%extreme
June Weather18°C (66°F)399 mm (15.7 inches)84%extreme
July Weather18°C (65°F)315 mm (12.4 inches)85%extreme
August Weather18°C (65°F)403 mm (15.9 inches)82%extreme
September Weather18°C (65°F)508 mm (20.0 inches)81%extreme
October Weather18°C (64°F)601 mm (23.7 inches)80%extreme
November Weather18°C (64°F)272 mm (10.7 inches)80%extreme
December Weather17°C (64°F)78 mm (3.1 inches)72%extreme

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