Sunrise & Sunset Times in San Marcos, TX
Today's exact sunrise, sunset, and daylight hours for San Marcos, Texas. Plus solar noon, civil twilight, and golden hour times — calculated from San Marcos's coordinates (29.88° N, 97.94° W).
About sunrise and sunset in San Marcos
San Marcos, TX sits at 29.88° N latitude in the subtropical zone. The longest day of the year here lasts about 13h 54m (around the summer solstice in June), while the shortest day shrinks to 10h 6m — a year-round swing of 3h 48m. Because San Marcos is in the eastern part of the Chicago time zone, solar noon arrives roughly 32 minutes after clock noon.
Subtropical — distinct but mild seasonal swing. The sun rises roughly east, swinging northeast in summer and southeast in winter, and sets roughly west, swinging northwest in summer and southwest in winter. Civil twilight (the period when the sun is between 0° and 6° below the horizon) lasts approximately 32 minutes around the equinoxes — a noticeable extended dawn and dusk window.
Quick facts for San Marcos
Solar noon offset reflects San Marcos's position in its time zone — the further from the time zone's standard meridian, the further the actual midday drifts from 12:00 on the clock.
Sunrise & Sunset in San Marcos
Today's sunrise and sunset times in San Marcos, TX. See exact sunrise, sunset, and daylight hours for San Marcos. Updated daily.
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Sunrise and sunset FAQ for San Marcos
How accurate are the San Marcos sunrise and sunset times?
Times are calculated using NOAA-grade astronomical algorithms based on San Marcos's exact coordinates (29.8833, -97.9414) and time zone (America/Chicago). Accuracy is typically within 1 minute. Local horizon obstructions (mountains, tall buildings) can shift the visible sunrise/sunset by a few minutes compared to the calculated value.
How long is the longest day of the year in San Marcos?
At San Marcos's latitude of 29.88° N, the longest day stretches to about 13h 54m on the June solstice. The shortest day, on the December solstice, is around 10h 6m — a year-round swing of roughly 3h 48m.
When is golden hour in San Marcos?
Golden hour in San Marcos occurs in the ~60-minute window after sunrise and before sunset, when the sun is low (typically below 6° elevation) and light is softer and warmer. Photographers favour this window for portraits and landscapes. The exact start/end depends on the season — golden hour is shorter near the equinoxes and longer in winter when the sun travels at a shallower angle.
Do San Marcos sunrise times change with daylight saving time?
Yes. All times shown here use San Marcos's local clock, which switches between standard time and daylight saving time on the dates set by US federal law (second Sunday in March, first Sunday in November). The actual position of the sun does not change — only the clock face does. See our Daylight Saving Time guide for the next change date.
In which direction does the sun rise and set in San Marcos?
In San Marcos, the sun rises in the east, swinging northeast in summer and southeast in winter, and sets in the west, swinging northwest in summer and southwest in winter. On the equinoxes (around 20 March and 22 September), the sun rises due east and sets due west. Between those dates, the sunrise/sunset points shift along the horizon as Earth's axial tilt changes the sun's declination.
What is solar noon, and when does it happen in San Marcos?
Solar noon is the moment the sun is at its highest point in the sky for the day. In San Marcos, solar noon arrives roughly 32 minutes after clock noon, because San Marcos sits in the eastern partof its time zone. The exact offset shifts a few minutes through the year due to Earth's elliptical orbit (the "equation of time").