Puerto Rico · 18.03° N · 66.85° W
Solar position in Yauco
Sun position, daylight and the best solar panel angle for Yauco — computed for 18.03° N, 66.85° W, 40 m above sea level.
The sun right now
Sun in Yauco today
Saturday, 24 October 2026 · local time UTC−4
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:10 | sun 18° below horizon |
| Nautical dawn | 05:35 | 12° below |
| Civil dawn | 06:01 | 6° below |
| Sunrise | 06:23 | 102° ESE |
| Golden hour ends | 06:53 | sun 6° up |
| Solar noon | 12:11 | 60.1° high |
| Golden hour starts | 17:29 | sun 6° up |
| Sunset | 17:59 | 258° WSW |
| Civil dusk | 18:21 | 6° below |
| Nautical dusk | 18:47 | 12° below |
| Astronomical dusk | 19:12 | 18° below |
| Day length | 11 h 36 min | |
Sun path diagram for Yauco
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 84.6° at solar noon in Yauco; on the December solstice only 48.5°. Sunrise swings from 65° ENE in June to 114° ESE in December — a 49° arc along the horizon.
Sunrise, sunset and sun height by month
Values for the 21st of each month, local clock time including daylight saving time.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 07:01 | 12:38 | 18:15 | 11 h 14 min | 52.2° |
| February | 06:51 | 12:41 | 18:30 | 11 h 40 min | 61.6° |
| March | 06:30 | 12:34 | 18:38 | 12 h 08 min | 72.4° |
| April | 06:06 | 12:26 | 18:45 | 12 h 39 min | 84.0° |
| May | 05:52 | 12:24 | 18:55 | 13 h 03 min | 87.8° |
| June | 05:52 | 12:29 | 19:05 | 13 h 13 min | 84.6° |
| July | 06:02 | 12:33 | 19:05 | 13 h 03 min | 87.7° |
| August | 06:11 | 12:30 | 18:49 | 12 h 39 min | 83.9° |
| September | 06:16 | 12:20 | 18:24 | 12 h 08 min | 72.5° |
| October | 06:22 | 12:11 | 18:01 | 11 h 38 min | 61.1° |
| November | 06:36 | 12:13 | 17:49 | 11 h 13 min | 52.0° |
| December | 06:54 | 12:25 | 17:57 | 11 h 03 min | 48.5° |
A year of daylight in Yauco
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Yauco
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
18°collects the most energy over a year: 1664 kWh per kWp.
22°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | November kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1599 | 96% | 3.55 | 1.5× |
| 15° | 1662 | 100% | 4.10 | 1.2× |
| 18° year-round best = latitude | 1664 | 100% | 4.18 | 1.2× |
| 22° off-grid best | 1659 | 100% | 4.27 | 1.2× |
| 30° | 1631 | 98% | 4.41 | 1.3× |
| 45° | 1507 | 91% | 4.45 | 1.5× |
| 60° | 1300 | 78% | 4.23 | 2.0× |
| 70° | 1125 | 68% | 3.94 | 2.5× |
| 90° | 763 | 46% | 3.06 | 3.2× |
A fixed array in Yauco produces the most over a year at 18°. The design month for an off-grid system is November: at 22° it makes 4.27 kWh per kWp a day, 2% more than at 18°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Yauco at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 18° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 18° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.64 | 5.35 | 4.37 | 4.42 | 25.8 °C |
| February | 5.40 | 5.10 | 4.18 | 4.87 | 25.6 °C |
| March | 5.99 | 4.30 | 3.51 | 5.03 | 25.7 °C |
| April | 6.35 | 3.20 | 2.59 | 4.96 | 26.3 °C |
| May | 6.09 | 2.43 | 1.94 | 4.52 | 27.1 °C |
| June | 6.12 | 2.19 | 1.73 | 4.43 | 27.8 °C |
| July | 6.15 | 2.28 | 1.80 | 4.49 | 28.1 °C |
| August | 6.07 | 2.80 | 2.24 | 4.61 | 28.4 °C |
| September | 5.70 | 3.62 | 2.91 | 4.59 | 28.5 °C |
| October | 5.11 | 4.31 | 3.49 | 4.40 | 28.2 °C |
| November | 4.53 | 4.85 | 3.94 | 4.18 | 27.4 °C |
| December | 4.38 | 5.31 | 4.33 | 4.22 | 26.5 °C |
| Year | 5.54 avg | 3.80 avg | 1125 kWh | 1664 kWh |
Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 680 Wp of panels at 70°, versus 280 Wp at 18°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Yauco
Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.
2.5 mrow pitch at 70°
2.5 mrow pitch at 18°
How Yauco compares in Puerto Rico
Against the other 20 places in Puerto Rico with climate data, for a fixed array at its best angle.
4thof 21 places in Puerto Rico for sunshine: 5.54 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Puerto Rico: 1,664 against 1,627 kWh per kWp.
−2 mindaylight on the longest day, compared with San Juan: 13 h 13 min against 13 h 14 min.
18°best year-round tilt here; across Puerto Rico it runs from 17° in San Juan to 18° in Arecibo.
Of the 21 places in Puerto Rico, Guayama gets the most sun (5.56 peak sun hours a day) and Barceloneta and one other place the least (5.26); Yauco ranks 4th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.73 kWh a day here, against 1.75 kWh on average in Puerto Rico. The shortest day lasts 11 h 03 min, +2 min compared with San Juan.
Solar forecast for Yauco, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Yauco
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A free, live card for Yauco: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.