May weather forecast
San Antonio, TX

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 May

The last month of the spring, May, is another warm month in San Antonio, Texas, with an average temperature varying between 85.6°F (29.8°C) and 67.3°F (19.6°C).

Temperature

In San Antonio, the average high-temperature in May slightly increases from a warm 79.7°F (26.5°C) in April to a still moderately hot 85.6°F (29.8°C). In San Antonio, in May, the average low-temperature is 67.3°F (19.6°C).

Heat index

In May, the average heat index is computed to be a torrid 95°F (35°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like metabolic differences, wind, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

May is the most humid month, with an average relative humidity of 73%.

Rainfall

May is the month with the most rainfall in San Antonio. Rain falls for 16.4 days and accumulates 3.66" (93mm) of precipitation.

Snowfall

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

Daylight

In San Antonio, the average length of the day in May is 13h and 38min.
On the first day of the month, sunrise is at 6:51 am and sunset at 8:10 pm. On the last day of May, sunrise is at 6:34 am and sunset at 8:28 pm CDT.

Sunshine

The average sunshine in May in San Antonio is 8h.

UV index

In May, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 in May interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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.
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FAQ

What is the temperature in May in San Antonio?

The average high-temperature, in May, is 85.6°F (29.8°C), while the average low-temperature is 67.3°F (19.6°C). in May, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is computed to be 95°F (35°C).

What is the most humid month in San Antonio?

May is the most humid month, with an average relative humidity of 73%.

What is the average humidity in May in San Antonio?

The average relative humidity in May in San Antonio, Texas, is 73%.

What is the wettest month in San Antonio?

May is the month with the most rainfall in San Antonio, Texas. Rain falls for 16.4 days and accumulates 3.66" (93mm) of precipitation.

How many days does it rain in May in San Antonio?

In San Antonio, in May, it is raining for 16.4 days, with typically 3.66" (93mm) of accumulated precipitation.

When it does not snow in San Antonio?

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

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

In May, the average day length is 13h and 38min.

What time are sunrise and sunset in May in San Antonio?

On the first day of May in San Antonio, sunrise is at 6:51 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:34 am and sunset at 8:28 pm CDT.

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

In May, the average sunshine duration in San Antonio is 8h.

What is the UV index intensity in May in San Antonio?

The average daily maximum UV index in May in San Antonio is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
San Antonio, TX

Average temperature in May - San Antonio, TX
  • Average high temperature in May: 85.6°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 May: 67.3°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).

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Average pressure in May
San Antonio, TX

Average pressure in May - San Antonio, TX
  • Average pressure in May: 29.9"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).

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Average wind speed in May
San Antonio, TX

Average wind speed in May - San Antonio, TX
  • Average wind speed in May: 9mph

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).

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Average humidity in May
San Antonio, TX

Average humidity in May - San Antonio, TX
  • Average humidity in May: 73%

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

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Average rainfall in May
San Antonio, TX

Average rainfall in May - San Antonio, TX
  • Average rainfall in May: 3.66"

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

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Average rainfall days in May
San Antonio, TX

Average rainfall days in May - San Antonio, TX
  • Average rainfall days in May: 16.4 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).

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Average snowfall in May
San Antonio, TX

Average snowfall in May - San Antonio, TX
  • Average snowfall in May: 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").

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Average snowfall days in May
San Antonio, TX

Average snowfall days in May - San Antonio, TX
  • Average snowfall days in May: 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).

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

Average daylight in May / Average sunshine in May - San Antonio, TX
  • Average daylight in May: 13h and 38min

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 May: 8h and 0min

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).

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Average sunshine days in May
San Antonio, TX

Average sunshine days in May - San Antonio, TX
  • Average sunshine days in May: 11.8 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).

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Average UV index in May
San Antonio, TX

Average UV index in May - San Antonio, TX
  • Average UV index in May: 6

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).

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Average cloud cover in May
San Antonio, TX

Average cloud cover in May - San Antonio, TX
  • Average cloud cover in May: 46

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

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Average visibility in May
San Antonio, TX

Average visibility in May - San Antonio, TX
  • Average visibility in May: 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).

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