June Weather in San Marcos, United States

Last updated: June 24, 2025

In June, the average temperature in San Marcos, United States is a pleasant 20°C (68°F), making it an ideal time to explore. Visitors can expect temperatures to range from a minimum of 12°C (54°F) to a maximum of 33°C (92°F). The month boasts a low precipitation level of just 3 mm (0.1 in), spread over 0 days, ensuring ample sunshine for outdoor activities. With an average humidity of 48%, the climate is comfortable and inviting.

June Temperature in San Marcos

In June in San Marcos, the average temperature is 20°C (68°F). Maximums can reach 33°C (92°F), and minimums can drop to as low as 12°C (54°F). This makes it an ideal time for travelers to enjoy a comfortable climate while exploring the area.

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 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 12°C (54°F).

Data source: Temperature data for San Marcos generated using information from the Copernicus Climate Change Service.

June Precipitation in San Marcos

In San Marcos in June, the precipitation amount is 3 mm (0.1 in) during a total of 0 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 3 mm (0.1 inches) of precipitation spread over approximately 0 days.

Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

June Humidity in San Marcos

In San Marcos in June humidity is 48%. With an average temperature of 20°C (68°F), this humidity feels like a pleasant and refreshing environment for traveling, creating an ideal atmosphere for exploring and enjoying outdoor activities.

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 48%, offering insight into how humid the weather typically is during this month.

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 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Marcos.

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 12, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	70 mm (2.8 inches)	72%	moderate
February Weather	13°C (56°F)	78 mm (3.1 inches)	77%	high
March Weather	14°C (58°F)	68 mm (2.7 inches)	67%	very high
April Weather	16°C (62°F)	32 mm (1.3 inches)	56%	very high
May Weather	17°C (63°F)	24 mm (0.9 inches)	46%	extreme
June Weather	20°C (68°F)	3 mm (0.1 inches)	48%	extreme
July Weather	23°C (73°F)	4 mm (0.2 inches)	46%	extreme
August Weather	24°C (75°F)	1 mm (0.1 inches)	42%	very high
September Weather	23°C (73°F)	5 mm (0.2 inches)	52%	very high
October Weather	20°C (69°F)	12 mm (0.5 inches)	58%	high
November Weather	17°C (63°F)	34 mm (1.4 inches)	66%	moderate
December Weather	14°C (57°F)	70 mm (2.7 inches)	74%	moderate