San Marcos weather in April: San Marcos, Texas: normal highs, lows, rain and records for April
San Marcos in April has a normal high of 80°F and a normal low of 56°F, a daily mean of 68°F, rising from 77°F on the 1st to 82°F by the 30th. Measurable precipitation falls on 7 days in a normal April, 3.20 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 13°C, 81 mm of precipitation in April.
- NOAA stationSan Marcos
- Station IDUSC00417983
- Location29.88°N 97.95°W
- Elevation665 ft (203 m)
- Population74,316
- Jan 62° 39°
- Feb 67° 42°
- Mar 73° 50°
- Apr 80° 56°
- May 86° 65°
- Jun 92° 72°
- Jul 96° 73°
- Aug 97° 74°
- Sep 91° 69°
- Oct 82° 58°
- Nov 72° 48°
- Dec 64° 41°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Marcos in April?
The normal high is 80°F and the normal low 56°F, for a daily mean of 68.0°F. April is 6.7°F warmer than March and 7.5°F cooler than May. April is the 7th warmest month of the year in San Marcos and the 5th wettest. Across the month the normal high rises 5°F, from 77°F on April 1 to 82°F on April 30. From one year to the next April's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Aprils in three average between 66°F and 70°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 25%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 77°F | 53°F | 25% | 14% |
| April 8 | 79°F | 55°F | 23% | 13% |
| April 15 | 80°F | 56°F | 22% | 13% |
| April 22 | 81°F | 58°F | 22% | 14% |
| April 30 | 82°F | 60°F | 22% | 15% |
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 | 77°F | 53°F | 25% | 14% | 12 h 30 min |
| April 2 | 77°F | 53°F | 25% | 13% | 12 h 30 min |
| April 3 | 78°F | 54°F | 24% | 13% | 12 h 30 min |
| April 4 | 78°F | 54°F | 24% | 13% | 12 h 30 min |
| April 5 | 78°F | 54°F | 24% | 13% | 12 h 30 min |
| April 6 | 78°F | 54°F | 24% | 13% | 12 h 40 min |
| April 7 | 78°F | 54°F | 24% | 13% | 12 h 40 min |
| April 8 | 79°F | 55°F | 23% | 13% | 12 h 40 min |
| April 9 | 79°F | 55°F | 23% | 13% | 12 h 40 min |
| April 10 | 79°F | 55°F | 23% | 13% | 12 h 40 min |
| April 11 | 79°F | 55°F | 23% | 13% | 12 h 40 min |
| April 12 | 79°F | 55°F | 23% | 13% | 12 h 50 min |
| April 13 | 79°F | 56°F | 23% | 13% | 12 h 50 min |
| April 14 | 80°F | 56°F | 22% | 13% | 12 h 50 min |
| April 15 | 80°F | 56°F | 22% | 13% | 12 h 50 min |
| April 16 | 80°F | 56°F | 22% | 13% | 12 h 50 min |
| April 17 | 80°F | 57°F | 22% | 13% | 13 h |
| April 18 | 80°F | 57°F | 22% | 13% | 13 h |
| April 19 | 80°F | 57°F | 22% | 13% | 13 h |
| April 20 | 81°F | 57°F | 22% | 13% | 13 h |
| April 21 | 81°F | 57°F | 22% | 13% | 13 h |
| April 22 | 81°F | 58°F | 22% | 14% | 13 h |
| April 23 | 81°F | 58°F | 22% | 14% | 13 h 10 min |
| April 24 | 81°F | 58°F | 22% | 14% | 13 h 10 min |
| April 25 | 82°F | 58°F | 22% | 14% | 13 h 10 min |
| April 26 | 82°F | 59°F | 22% | 14% | 13 h 10 min |
| April 27 | 82°F | 59°F | 22% | 14% | 13 h 10 min |
| April 28 | 82°F | 59°F | 22% | 14% | 13 h 10 min |
| April 29 | 82°F | 60°F | 22% | 15% | 13 h 10 min |
| April 30 | 82°F | 60°F | 22% | 15% | 13 h 20 min |
- Normal high
- 80°FApril average
- Normal low
- 56°FApril average
- Precipitation
- 3.20 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 2
- 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
- 18
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00417983; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Marcos in April?
On a given April day the chance of 0.01 inch or more is 23% on average, highest around April 1 (25%). In all, 3.20 in falls on 7 days of a normal April, 1 of them with an inch or more.
In a normal April in San Marcos, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00417983.
What are the records for April in San Marcos?
The warmest April temperature on this station's record (since 1895) is 102°F, on April 17, 1920; the coldest is 30°F, on April 5, 1920. The wettest April brought 10.30 in (1926).
The April mean against the 1991-2020 normal of 68.0°F: 2022 70.8°F (+2.8), 2023 66.0°F (−2.0), 2024 70.9°F (+2.9), 2025 72.8°F (+4.8), 2026 72.0°F (+4.0). 4 of 5 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 70.8°F | +2.8°F | 0.47 in |
| 2023 | 66.0°F | −2.0°F | 5.68 in |
| 2024 | 70.9°F | +2.9°F | 2.75 in |
| 2025 | 72.8°F | +4.8°F | 1.64 in |
| 2026 | 72.0°F | +4.0°F | 8.73 in |
Source: records: ACIS, station USC00417983; recent months: ACIS, station USC00417983. Records and recent months use complete months only.
How does April in San Marcos 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 Marcos's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.