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 Juana Díaz Today
The live calculator above computes sunrise, sunset, solar noon, day length, golden hour, and each twilight boundary for the current calendar date in Juana Díaz, Puerto Rico. It runs in your browser from the city-center coordinates and the America/Puerto_Rico 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 Juana Díaz
Juana Díaz lies at just 18.05°N, close enough to the tropics that day length stays relatively even year-round. The difference between the longest and shortest day here is only 2h 10m.
On the summer solstice around June 21, Juana Díaz receives 13h 13m of daylight — the longest day of the year. By the winter solstice around December 21, that shrinks to 11h 3m, the shortest day. At the spring and autumn equinoxes, day and night are nearly equal at about 12h 7m, 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 Juana Díaz 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 Juana Díaz 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 Juana Díaz
Where the Sun sits in the sky over Juana Díaz depends on the season, and the contrast between summer and winter is set by the city's latitude of 18.05°N. On the summer solstice the midday Sun climbs to 84.6° above the horizon in Juana Díaz — nearly straight overhead, leaving objects almost no shadow at solar noon. On the winter solstice the midday Sun only reaches 48.5°, sitting much lower in the southern sky and casting long shadows even at noon.
Those roughly 36 degrees separating the summer and winter midday Sun are exactly what give Juana Díaz 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 Juana Díaz
It is natural to assume Juana Díaz sees its latest sunset on the longest day of the year, but it does not. The latest sunset actually falls around July 6 at about 7:06 PM, while the earliest sunset comes around November 23 at roughly 5:48 PM — noticeably before the December solstice.
On the morning side, the earliest sunrise in Juana Díaz is around June 4 at 5:50 AM, and the latest sunrise around January 18 at 7:01 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 Juana Díaz 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.
No Clock Changes in Juana Díaz
Unlike most of the United States, Juana Díaz, Puerto Rico does not observe daylight saving time. Puerto Rico stays on Atlantic Standard Time all year. At tropical latitudes the difference between the longest and shortest day is small, so there is little evening daylight to "save."
In practice this means no jarring one-hour jump in sunrise and sunset twice a year. Across the whole year, sunset in Juana Díaz only ranges from about 5:48 PM at the earliest to 7:06 PM at the latest — the change residents notice is gradual and driven purely by the Sun, never by the clock.
One side effect worth knowing: the time difference between Juana Díaz and cities that do change their clocks shifts twice a year. A place that is normally in the same hour can be an hour off from mid-March to early November, which matters for calls, broadcasts, and travel schedules.
Golden Hour & Blue Hour Photography in Juana Díaz
For photographers in Juana Díaz, Puerto Rico, 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 Juana Díaz's local timezone.
Golden "hour" is a misnomer — its length in Juana Díaz 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 29 minutes; near the June solstice, when the Sun rises and sets at a shallower angle, it stretches to roughly 31 minutes, and near the December solstice it lasts about 32 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 Juana Díaz: the air is usually calmer and clearer than at sunset, and locations are emptier.
Solar Energy Potential in Juana Díaz
Under clear skies, Juana Díaz, Puerto Rico receives about 6.5 peak sun hours per day averaged across the year — from roughly 4.6 in December up to 7.8 in May. One peak sun hour equals one hour of sunlight at full intensity (1 kW/m²), the standard unit for estimating solar panel output.
Because Juana Díaz sits at 18.1°N, a fixed, south-facing panel captures the most energy over the year when tilted at roughly 18° from horizontal — about equal to the latitude. If you adjust the tilt seasonally, flatten to about 3° in summer, when the Sun rides high, and steepen to about 33° in winter, when it stays low.
These are theoretical clear-sky values computed from Juana Díaz'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 Juana Díaz Compares
Daylight in Juana Díaz swings 2h 10m between the June and December solstices. The median across the 1,847 cities on this site is 5h 16m, so Juana Díaz has a 3h 6m gentler seasonal swing than a typical American city. By that measure Juana Díaz ranks 1846th of 1,847 nationally, and 12th of the 13 Puerto Rico cities listed here — counting from the largest swing down.
Juana Díaz sits about 6.5° west of 60°W — the meridian Atlantic Time (no daylight saving) is built around. Longitude alone therefore puts mean solar noon roughly 26 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 Juana Díaz
Juana Díaz, Puerto Rico, has an estimated urban-area population of 66,308. Its primary county or equivalent is Juana Díaz; its center is at 18.05°N, 66.50°W. Clocks here follow Atlantic Time (no daylight saving), which is the timezone all sunrise, sunset, golden-hour and twilight times on this page are shown in.
Because these times are computed from Juana Díaz'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 Juana Díaz area.