Seasonal figures below use a 2025 reference year. Choose a date in the planner above for that day’s times, golden hour, twilight, and daylight milestones.
Sunrise & Sunset in Palo Alto Today
The live calculator above computes sunrise, sunset, solar noon, day length, golden hour, and each twilight boundary for the current calendar date in Palo Alto, California. It runs in your browser from the city-center coordinates and the America/Los_Angeles timezone, so the answer stays current even though this page is a permanent static file.
Times are rounded to the nearest minute. They model a standard, unobstructed horizon; mountains, buildings, elevation, weather, and unusual atmospheric refraction can move the sunrise or sunset you actually observe by a few minutes.
Daylight Through the Year in Palo Alto
Palo Alto sits at 37.39°N, a mid-latitude position that gives it a balanced but noticeable seasonal rhythm. The difference between its longest and shortest day is 5h 10m.
On the summer solstice around June 21, Palo Alto receives 14h 45m of daylight — the longest day of the year. By the winter solstice around December 21, that shrinks to 9h 35m, the shortest day. At the spring and autumn equinoxes, day and night are nearly equal at about 12h 9m, as they are everywhere on Earth.
The reason is the Earth's axial tilt of roughly 23.44 degrees. In summer the Northern Hemisphere leans toward the Sun, so Palo Alto sees the Sun climb high and trace a long arc across the sky. In winter the hemisphere leans away, the Sun stays low, and the days are short. The change is fastest near the equinoxes — in Palo Alto the sunset can shift by two to three minutes per day in March and September — and slowest near the solstices, when it barely moves for weeks.
The Sun's Path Over Palo Alto
Where the Sun sits in the sky over Palo Alto depends on the season, and the contrast between summer and winter is set by the city's latitude of 37.39°N. On the summer solstice the midday Sun reaches 76.1° above the horizon in Palo Alto, its highest point of the year. On the winter solstice the midday Sun only reaches 29.2°, sitting much lower in the southern sky and casting long shadows even at noon.
Those roughly 47 degrees separating the summer and winter midday Sun are exactly what give Palo Alto its seasons. A high summer Sun delivers its energy almost straight down, warming the ground efficiently and producing intense midday light. A low winter Sun spreads the same energy across a wider area and filters it through more atmosphere, which is why winters are cooler and the light feels softer and warmer in tone.
Through the day the Sun rises in the east, swings through the southern sky, and sets in the west. Around the summer solstice it rises and sets well to the north of due east and west; around the winter solstice it rises and sets to the south. The exact bearing for any moment — along with the Sun's current altitude and ESE-to-WSW arc — is shown live in the tracker at the top of this page.
Earliest and Latest Sunrises and Sunsets in Palo Alto
It is natural to assume Palo Alto sees its latest sunset on the longest day of the year, but it does not. The latest sunset actually falls around June 28 at about 8:33 PM, while the earliest sunset comes around December 6 at roughly 4:50 PM — noticeably before the December solstice.
On the morning side, the earliest sunrise in Palo Alto is around June 13 at 5:47 AM, and the latest sunrise around November 1 at 7:34 AM. These dates drift away from the solstices because of two effects working together: the equation of time, which comes from the Earth's tilt and its slightly elliptical orbit, and the clock shift of daylight saving time. The result is that solar noon itself wanders earlier and later by up to about 16 minutes over the year, pulling the sunrise and sunset extremes onto dates that surprise most people.
Below the Sun's path, twilight extends the usable light at each end of the day. Civil twilight (Sun 0–6° below the horizon) keeps Palo Alto bright enough for most outdoor activity; nautical twilight (6–12°) is when the brighter stars and the sea horizon are both visible; and astronomical twilight (12–18°) is the final fade to true darkness. The live calculator above lists today's calculated boundaries for all three.
How Daylight Saving Time Moves Sunrise and Sunset in Palo Alto
Palo Alto, California changes its clocks twice a year, and both changes are visible in this page's numbers. On the second Sunday in March, Palo Alto springs forward and the evening changes overnight: sunset jumps from about 6:10 PM on Saturday to about 7:11 PM on Sunday. The price is paid at dawn — sunrise slips from around 6:29 AM back to 7:28 AM, so mornings turn dark again just as they were brightening.
The reverse comes on the first Sunday in November, when clocks fall back: sunset drops from about 6:10 PM to 5:09 PM in a single day — the abrupt start of the early-dusk season — while sunrise brightens from around 7:34 AM to 6:35 AM.
Nothing astronomical happens on either date — the Sun keeps its slow seasonal drift, and only the clock label shifts. But because the change lands all at once instead of a minute or two a day, these two Sundays produce the most noticeable "sunset whiplash" of the year in Palo Alto. (Times shown are for a typical year; the exact clock times vary by a few minutes depending on where the statutory Sunday falls.)
Golden Hour & Blue Hour Photography in Palo Alto
For photographers in Palo Alto, California, the planner shows your selected date's morning and evening golden-hour and blue-hour windows. Choose Today, Tomorrow, or a date in the calendar; all clock times are calculated in Palo Alto's local timezone.
Golden "hour" is a misnomer — its length in Palo Alto depends on the season, because it lasts as long as the Sun takes to climb from the horizon to 6° (or descend back). Around the equinoxes it runs about 34 minutes; near the June solstice, when the Sun rises and sets at a shallower angle, it stretches to roughly 39 minutes, and near the December solstice it lasts about 41 minutes.
Golden hour gives warm tones, long soft shadows, and directional light that flatters landscapes and portraits alike. Blue hour — when the Sun sits 4–6° below the horizon — delivers an even, cool-toned sky that balances beautifully against artificial lights, which is why it's the classic window for cityscape and architecture shots. Sunrise sessions have a practical edge in Palo Alto: the air is usually calmer and clearer than at sunset, and locations are emptier.
Solar Energy Potential in Palo Alto
Under clear skies, Palo Alto, California receives about 5.3 peak sun hours per day averaged across the year — from roughly 2.2 in December up to 8.3 in June. One peak sun hour equals one hour of sunlight at full intensity (1 kW/m²), the standard unit for estimating solar panel output.
Because Palo Alto sits at 37.4°N, a fixed, south-facing panel captures the most energy over the year when tilted at roughly 37° from horizontal — about equal to the latitude. If you adjust the tilt seasonally, flatten to about 22° in summer, when the Sun rides high, and steepen to about 52° in winter, when it stays low.
These are theoretical clear-sky values computed from Palo Alto's solar geometry — they show the shape of the year and the ceiling on production, not a forecast. Actual output depends on local cloud cover, temperature, shading, and equipment, so treat the figures as an upper bound and the month-to-month pattern as the reliable part. The seasonal swing is real and unavoidable: in December the Sun is above the horizon for fewer hours and sits lower in the sky, spreading its energy across more atmosphere and more ground.
How Palo Alto Compares
Daylight in Palo Alto swings 5h 10m between the June and December solstices. That is within a quarter-hour of the median of 5h 16m across the 1,847 cities on this site, making Palo Alto close to typical for the United States. By that measure Palo Alto ranks 983rd of 1,847 nationally, and 92nd of the 307 California cities listed here — counting from the largest swing down.
Palo Alto sits about 2.1° west of 120°W — the meridian Pacific Time is built around. Longitude alone therefore puts mean solar noon roughly 9 minutes after clock noon in standard time, so the Sun runs behind the clock here, which is why evenings hold light later than the time zone would suggest. This offset is fixed by geography, but it is not the whole story: the equation of time moves true solar noon up to about 16 minutes either side of the mean across the year, which is why the solar-noon figure at the top of this page drifts from month to month.
About Sun Times in Palo Alto
Palo Alto, California, has an estimated urban-area population of 67,237. Its primary county or equivalent is Santa Clara; its center is at 37.39°N, 122.15°W. Clocks here follow Pacific Time, which is the timezone all sunrise, sunset, golden-hour and twilight times on this page are shown in.
Because these times are computed from Palo Alto's city-center coordinates rather than a regional average, they can differ by a few minutes from a neighboring town to the east or west — the Sun reaches places farther east first. For planning away from the city center, compare the nearby-city pages and allow for the local terrain and horizon in the Santa Clara area.