April weather forecastSan Antonio, TX
April
Weather in April
April experiences more dynamic and occasionally unpredictable weather conditions. Following March, San Antonio becomes warmer and experiences a more humid atmosphere. The rise in temperature goes hand in hand with an increase in the number of rainfall days, spiking from 14.1 days in March to 14.7 days in April. This month sees a further mild uptick in wind speed, reaching a monthly maximum of 9.6mph (15.4km/h). The longer, warmer days and increased rainfall combine to enhance the city's green spaces, offering a visual treat during this period.Temperature
The start of April signals a slight increase in the average high-temperature, moving from a pleasant 72.7°F (22.6°C) in March to a warm 79.7°F (26.5°C). April nights are marked by an average temperature drop to a moderate 60.6°F (15.9°C).Humidity
In April, the average relative humidity is 70%.Rainfall
In San Antonio, during April, the rain falls for 14.7 days and regularly aggregates up to 1.85" (47mm) of precipitation. Throughout the year, there are 144.5 rainfall days, and 22.6" (574mm) of precipitation is accumulated.Snowfall
In San Antonio, snow does not fall in March through November.Daylight
The average length of the day in April is 12h and 54min.On the first day of the month, sunrise is at 7:22 am and sunset at 7:52 pm. On the last day of April, sunrise is at 6:52 am and sunset at 8:10 pm CDT.
Sunshine
In April, the average sunshine in San Antonio is 7.4h.UV index
In San Antonio, the average daily maximum UV index in April is 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 6 during April leads to these instructions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
San Antonio, TX
- Average high temperature in April: 79.7°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 April: 60.6°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 April
San Antonio, TX
- Average pressure in April: 29.91"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 April
San Antonio, TX
- Average wind speed in April: 8.9mph
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).
Average humidity in April
San Antonio, TX
- Average humidity in April: 70%
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (59%).
Average rainfall in April
San Antonio, TX
- Average rainfall in April: 1.85"
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 April
San Antonio, TX
- Average rainfall days in April: 14.7 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 April
San Antonio, TX
- Average snowfall in April: 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 April
San Antonio, TX
- Average snowfall days in April: 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 April /
Average sunshine in April
San Antonio, TX
- Average daylight in April: 12h and 54min
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 April: 7h and 24min
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 April
San Antonio, TX
- Average sunshine days in April: 12.9 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 April
San Antonio, TX
- Average UV index in April: 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).
Average cloud cover in April
San Antonio, TX
- Average cloud cover in April: 44
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 April
San Antonio, TX
- Average visibility in April: 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).
