San Antonio weather in April: San Antonio, Texas: normal highs, lows, rain and records for April
San Antonio in April has a normal high of 80°F and a normal low of 58°F, a daily mean of 69°F, rising from 78°F on the 1st to 83°F by the 30th. Measurable precipitation falls on 6 days in a normal April, 2.42 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 15°C, 61 mm of precipitation in April.
- NOAA stationSan Antonio International Airport
- Station IDUSW00012921
- Location29.54°N 98.48°W
- Elevation789 ft (241 m)
- From the center6 miles
- Population1,526,656
- Jan 63° 41°
- Feb 68° 45°
- Mar 74° 52°
- Apr 80° 58°
- May 87° 66°
- Jun 92° 73°
- Jul 95° 75°
- Aug 96° 75°
- Sep 90° 70°
- Oct 82° 60°
- Nov 72° 50°
- Dec 65° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Antonio in April?
The normal high is 80°F and the normal low 58°F, for a daily mean of 69.4°F. April is 6.6°F warmer than March and 7.1°F cooler than May. April is the 7th warmest month of the year in San Antonio and the 5th wettest. Across the month the normal high rises 5°F, from 78°F on April 1 to 83°F on April 30. From one year to the next April's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Aprils in three average between 67°F and 72°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 78°F | 55°F | 24% | 13% |
| April 8 | 79°F | 57°F | 23% | 12% |
| April 15 | 80°F | 58°F | 22% | 12% |
| April 22 | 81°F | 60°F | 23% | 13% |
| April 30 | 83°F | 62°F | 24% | 14% |
Every day of April: normal high, low and chance of precipitation (warmest afternoon April 30, coldest night April 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| April 1 | 78°F | 55°F | 24% | 13% | 12 h 30 min |
| April 2 | 78°F | 56°F | 24% | 13% | 12 h 30 min |
| April 3 | 78°F | 56°F | 24% | 12% | 12 h 30 min |
| April 4 | 78°F | 56°F | 24% | 12% | 12 h 30 min |
| April 5 | 79°F | 56°F | 23% | 12% | 12 h 30 min |
| April 6 | 79°F | 56°F | 23% | 12% | 12 h 40 min |
| April 7 | 79°F | 57°F | 23% | 12% | 12 h 40 min |
| April 8 | 79°F | 57°F | 23% | 12% | 12 h 40 min |
| April 9 | 79°F | 57°F | 23% | 12% | 12 h 40 min |
| April 10 | 79°F | 57°F | 23% | 12% | 12 h 40 min |
| April 11 | 80°F | 57°F | 23% | 12% | 12 h 40 min |
| April 12 | 80°F | 58°F | 23% | 12% | 12 h 50 min |
| April 13 | 80°F | 58°F | 23% | 12% | 12 h 50 min |
| April 14 | 80°F | 58°F | 23% | 12% | 12 h 50 min |
| April 15 | 80°F | 58°F | 22% | 12% | 12 h 50 min |
| April 16 | 80°F | 58°F | 22% | 12% | 12 h 50 min |
| April 17 | 81°F | 59°F | 23% | 12% | 12 h 50 min |
| April 18 | 81°F | 59°F | 23% | 12% | 13 h |
| April 19 | 81°F | 59°F | 23% | 13% | 13 h |
| April 20 | 81°F | 59°F | 23% | 13% | 13 h |
| April 21 | 81°F | 60°F | 23% | 13% | 13 h |
| April 22 | 81°F | 60°F | 23% | 13% | 13 h |
| April 23 | 82°F | 60°F | 23% | 13% | 13 h |
| April 24 | 82°F | 60°F | 23% | 13% | 13 h 10 min |
| April 25 | 82°F | 61°F | 23% | 13% | 13 h 10 min |
| April 26 | 82°F | 61°F | 23% | 13% | 13 h 10 min |
| April 27 | 82°F | 61°F | 23% | 13% | 13 h 10 min |
| April 28 | 82°F | 61°F | 23% | 14% | 13 h 10 min |
| April 29 | 83°F | 62°F | 24% | 14% | 13 h 10 min |
| April 30 | 83°F | 62°F | 24% | 14% | 13 h 20 min |
- Normal high
- 80°FApril average
- Normal low
- 58°FApril average
- Precipitation
- 2.42 inmonth total
- Days with precipitation
- 60.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 12 h 30 min to 13 h 20 minApril 1 to April 30
- Days at 70°F or more
- 28
- Days at 80°F or more
- 19
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012921; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Antonio in April?
On a given April day the chance of 0.01 inch or more is 23% on average, highest around April 1 (24%). In all, 2.42 in falls on 6 days of a normal April, 1 of them with an inch or more.
In a normal April in San Antonio, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012921.
How humid and windy is San Antonio in April?
At 3 p.m. the normal temperature is 82°F with 45% relative humidity and a dew point of 59°F; at 6 a.m. it is 65°F with 83% humidity. The wind averages 9.8 mph, most often from the southeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 65°F | 59°F | 83% | 7.4 mph | 23% |
| 9 a.m. | 71°F | 60°F | 68% | 10.1 mph | 24% |
| noon | 78°F | 59°F | 52% | 10.9 mph | 29% |
| 3 p.m. | 82°F | 59°F | 45% | 11.4 mph | 32% |
| 6 p.m. | 80°F | 58°F | 46% | 12.0 mph | 36% |
| 9 p.m. | 73°F | 59°F | 63% | 10.4 mph | 40% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00012921. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for April in San Antonio?
The warmest April temperature on San Antonio's official record (since 1885) is 101°F, on April 19, 1996; the coldest is 31°F, on April 3, 1987. The wettest April brought 11.64 in (1915).
The April mean against the 1991-2020 normal of 69.4°F: 2021 70.6°F (+1.2), 2022 74.3°F (+4.9), 2023 69.2°F (−0.2), 2024 72.5°F (+3.1), 2025 74.6°F (+5.2), 2026 73.2°F (+3.8). 5 of 6 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 70.6°F | +1.2°F | 6.05 in |
| 2022 | 74.3°F | +4.9°F | 1.24 in |
| 2023 | 69.2°F | −0.2°F | 4.75 in |
| 2024 | 72.5°F | +3.1°F | 3.07 in |
| 2025 | 74.6°F | +5.2°F | 1.91 in |
| 2026 | 73.2°F | +3.8°F | 7.46 in |
Source: records: ACIS, NWS threaded record SATthr; recent months: ACIS, station USW00012921. Records and recent months use complete months only.
How does April in San Antonio compare across Texas?
Across the 321 places PlainClimate covers in Texas, April normal highs run from 70°F in Hartley to 90°F in Terlingua; San Antonio's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.