June weather forecast
San Antonio, TX

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Buildings in San Antonio, Texas, with a calm view of the bridges across the waterfront
Buildings in San Antonio, Texas, with a calm view of the bridges across the waterfront

Weather in June

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.
Updated: Feb 14, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

How hot is it in San Antonio in June?

In San Antonio, in June, the average high-temperature is 92.1°F (33.4°C), and the average low-temperature is 72.7°F (22.6°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, in June is estimated at 113°F (45°C).

What is the average humidity in June in San Antonio?

The average relative humidity in June is 70%.

How much does it rain in San Antonio in June?

In San Antonio, Texas, in June, it is raining for 13.1 days, with typically 2.09" (53mm) of accumulated precipitation.

When it does not snow in San Antonio?

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

When are the longest days in San Antonio?

With an average of 14h and 0min of daylight, June has the longest days of the year.

What is the average length of the day in June in San Antonio?

The average day length in June in San Antonio is 14h and 0min.

When are sunrise and sunset in June in San Antonio?

On the first day of June in San Antonio, Texas, 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.

How long on average sun shines in June in San Antonio?

The average sunshine duration in June in San Antonio is 9.3h.

What is the month with the highest UV index in San Antonio?

June through August, with an average maximum UV index of 7, are months with the highest UV index in San Antonio.

What is the UV index reading in June in San Antonio?

In June, the average daily maximum UV index in San Antonio is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in June
San Antonio, TX

Average temperature in June - San Antonio, TX
  • Average high temperature in June: 92.1°F

The warmest month (with the highest average high temperature) is August (96.6°F).
The month with the lowest average high temperature is January (61.7°F).

  • Average low temperature in June: 72.7°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).

Average pressure in June
San Antonio, TX

Average pressure in June - San Antonio, TX
  • Average pressure in June: 29.89"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in June
San Antonio, TX

Average wind speed in June - San Antonio, TX
  • Average wind speed in June: 8mph

The windiest month (with the highest average wind speed) is May (9mph).
The calmest month (with the lowest average wind speed) is September (6.5mph).

Average humidity in June
San Antonio, TX

Average humidity in June - San Antonio, TX
  • Average humidity in June: 70%

The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (59%).

Average rainfall in June
San Antonio, TX

Average rainfall in June - San Antonio, TX
  • Average rainfall in June: 2.09"

The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is February (0.98").

Average rainfall days in June
San Antonio, TX

Average rainfall days in June - San Antonio, TX
  • Average rainfall days in June: 13.1 days

The month with the highest number of rainy days is September (17 days).
The month with the least rainy days is January (9.1 days).

Average snowfall in June
San Antonio, TX

Average snowfall in June - San Antonio, TX
  • Average snowfall in June: 0"

The months with the highest snowfall are January and February (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").

Average snowfall days in June
San Antonio, TX

Average snowfall days in June - San Antonio, TX
  • Average snowfall days in June: 0 days

The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average daylight in June /
Average sunshine in June
San Antonio, TX

Average daylight in June / Average sunshine in June - San Antonio, TX
  • Average daylight in June: 14h and 0min

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

  • Average sunshine in June: 9h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

Average sunshine days in June
San Antonio, TX

Average sunshine days in June - San Antonio, TX
  • Average sunshine days in June: 14.2 days

The month with the most sunshine days is January (20.3 days).
The months with the least sunshine days are May and September (11.8 days).

Average UV index in June
San Antonio, TX

Average UV index in June - San Antonio, TX
  • Average UV index in June: 7

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in June
San Antonio, TX

Average cloud cover in June - San Antonio, TX
  • Average cloud cover in June: 37

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 23).

Average visibility in June
San Antonio, TX

Average visibility in June - San Antonio, TX
  • Average visibility in June: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

San Antonio, Texas, USA

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