Puerto Rico · 17.98° N · 66.11° W
Solar position in Guayama
Sun position, daylight and the best solar panel angle for Guayama — computed for 17.98° N, 66.11° W, 73 m above sea level.
The sun right now
Sun in Guayama today
Saturday, 24 October 2026 · local time UTC−4
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:07 | sun 18° below horizon |
| Nautical dawn | 05:32 | 12° below |
| Civil dawn | 05:58 | 6° below |
| Sunrise | 06:20 | 102° ESE |
| Golden hour ends | 06:50 | sun 6° up |
| Solar noon | 12:08 | 60.1° high |
| Golden hour starts | 17:26 | sun 6° up |
| Sunset | 17:56 | 258° WSW |
| Civil dusk | 18:18 | 6° below |
| Nautical dusk | 18:44 | 12° below |
| Astronomical dusk | 19:09 | 18° below |
| Day length | 11 h 36 min | |
Sun path diagram for Guayama
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 84.5° at solar noon in Guayama; on the December solstice only 48.6°. 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 | 06:58 | 12:35 | 18:12 | 11 h 14 min | 52.2° |
| February | 06:48 | 12:38 | 18:28 | 11 h 40 min | 61.6° |
| March | 06:27 | 12:31 | 18:35 | 12 h 08 min | 72.4° |
| April | 06:03 | 12:23 | 18:42 | 12 h 39 min | 84.0° |
| May | 05:49 | 12:21 | 18:52 | 13 h 03 min | 87.7° |
| June | 05:50 | 12:26 | 19:02 | 13 h 13 min | 84.5° |
| July | 05:59 | 12:30 | 19:02 | 13 h 03 min | 87.6° |
| August | 06:08 | 12:27 | 18:46 | 12 h 39 min | 84.0° |
| September | 06:13 | 12:17 | 18:21 | 12 h 08 min | 72.5° |
| October | 06:19 | 12:08 | 17:58 | 11 h 38 min | 61.2° |
| November | 06:33 | 12:10 | 17:46 | 11 h 13 min | 52.0° |
| December | 06:51 | 12:22 | 17:54 | 11 h 03 min | 48.6° |
A year of daylight in Guayama
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 Guayama
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
17°collects the most energy over a year: 1668 kWh per kWp.
23°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° | 1604 | 96% | 3.54 | 1.5× |
| 15° | 1667 | 100% | 4.09 | 1.2× |
| 17° year-round best | 1668 | 100% | 4.14 | 1.2× |
| 18° = latitude | 1668 | 100% | 4.17 | 1.2× |
| 23° off-grid best | 1662 | 100% | 4.28 | 1.2× |
| 30° | 1635 | 98% | 4.39 | 1.3× |
| 45° | 1509 | 90% | 4.43 | 1.5× |
| 60° | 1301 | 78% | 4.22 | 2.0× |
| 70° | 1125 | 67% | 3.93 | 2.5× |
| 90° | 762 | 46% | 3.05 | 3.2× |
A fixed array in Guayama produces the most over a year at 17°. The design month for an off-grid system is November: at 23° it makes 4.28 kWh per kWp a day, 3% more than at 17°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Guayama at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 17° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 17° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.66 | 5.37 | 4.39 | 4.40 | 25.8 °C |
| February | 5.44 | 5.14 | 4.21 | 4.88 | 25.6 °C |
| March | 6.01 | 4.31 | 3.52 | 5.05 | 25.7 °C |
| April | 6.36 | 3.21 | 2.59 | 4.99 | 26.3 °C |
| May | 6.11 | 2.42 | 1.93 | 4.56 | 27.1 °C |
| June | 6.15 | 2.18 | 1.73 | 4.49 | 27.8 °C |
| July | 6.20 | 2.28 | 1.81 | 4.55 | 28.1 °C |
| August | 6.11 | 2.80 | 2.24 | 4.65 | 28.4 °C |
| September | 5.72 | 3.63 | 2.92 | 4.61 | 28.5 °C |
| October | 5.10 | 4.30 | 3.48 | 4.38 | 28.2 °C |
| November | 4.52 | 4.83 | 3.93 | 4.14 | 27.4 °C |
| December | 4.36 | 5.28 | 4.30 | 4.17 | 26.5 °C |
| Year | 5.56 avg | 3.81 avg | 1125 kWh | 1668 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 17°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Guayama
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 17°
How Guayama compares in Puerto Rico
Against the other 20 places in Puerto Rico with climate data, for a fixed array at its best angle.
1stof 21 places in Puerto Rico for sunshine: 5.56 peak sun hours a day on flat ground.
+3%solar energy a year compared with the average place in Puerto Rico: 1,668 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.
17°best year-round tilt here; across Puerto Rico it runs from 17° in San Juan to 18° in Arecibo.
Guayama gets the most sun of the 21 places in Puerto Rico (5.56 peak sun hours a day); the least sunny are Barceloneta and one other place with 5.26. 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 Guayama, 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 Guayama
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Places near Guayama
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A free, live card for Guayama: 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.