June weather forecast
San Antonio, TX

June offers the first taste of summer in San Antonio. From May to June, daylight hours extend further, reaching their highest value at 14 hours. However, despite the hot days, rainfall lessens to 2.09in in June compared to May. Characterized by more sunshine and fewer clouds, San Antonio indeed starts reflecting the summer season. Residents start to enjoy water activities as the city's famous rivers provide a fun and cool escape from the heat.

Temperature

June in San Antonio signals a minor shift in the average high-temperature, moving from May's moderately hot 85.6°F (29.8°C) to a tropical 92.1°F (33.4°C). In San Antonio, in June, the average low-temperature is an agreeable 72.7°F (22.6°C).

Heat index

The average heat index in June is estimated at a burning hot 113°F (45°C). Stay wary: Heat exhaustion and heat cramps are possible. Heatstroke can ensue from extended effort.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The average relative humidity in June in San Antonio is 70%.

Rainfall

In San Antonio, Texas, during June, the rain falls for 13.1 days and regularly aggregates up to 2.09" (53mm) of precipitation. In San Antonio, during the entire year, the rain falls for 144.5 days and collects up to 22.6" (574mm) of precipitation.

Snowfall

In San Antonio, snow does not fall in March through November.

Daylight

With an average of 14h and 0min of daylight, June has the longest days of the year in San Antonio.
On the first day of June in San Antonio, sunrise is at 6:34 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 8:37 pm CDT.

Sunshine

In San Antonio, the average sunshine in June is 9.3h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 7 in June translates into this advice:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.