Puerto Rico · 18.20° N · 67.14° W
Solar position in Mayagüez
Sun position, daylight and the best solar panel angle for Mayagüez — computed for 18.20° N, 67.14° W, 21 m above sea level.
The sun right now
Sun in Mayagüez today
Saturday, 24 October 2026 · local time UTC−4
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:11 | sun 18° below horizon |
| Nautical dawn | 05:37 | 12° below |
| Civil dawn | 06:02 | 6° below |
| Sunrise | 06:24 | 102° ESE |
| Golden hour ends | 06:54 | sun 6° up |
| Solar noon | 12:12 | 59.9° high |
| Golden hour starts | 17:30 | sun 6° up |
| Sunset | 18:00 | 258° WSW |
| Civil dusk | 18:22 | 6° below |
| Nautical dusk | 18:48 | 12° below |
| Astronomical dusk | 19:13 | 18° below |
| Day length | 11 h 35 min | |
Sun path diagram for Mayagüez
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 84.8° at solar noon in Mayagüez; on the December solstice only 48.4°. Sunrise swings from 65° ENE in June to 114° ESE in December — a 50° 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 | 07:03 | 12:40 | 18:16 | 11 h 13 min | 52.0° |
| February | 06:52 | 12:42 | 18:31 | 11 h 39 min | 61.4° |
| March | 06:31 | 12:35 | 18:39 | 12 h 08 min | 72.2° |
| April | 06:07 | 12:27 | 18:46 | 12 h 39 min | 83.8° |
| May | 05:53 | 12:25 | 18:56 | 13 h 03 min | 87.9° |
| June | 05:53 | 12:30 | 19:07 | 13 h 13 min | 84.8° |
| July | 06:03 | 12:35 | 19:06 | 13 h 04 min | 87.8° |
| August | 06:12 | 12:31 | 18:51 | 12 h 39 min | 83.7° |
| September | 06:17 | 12:21 | 18:25 | 12 h 08 min | 72.3° |
| October | 06:23 | 12:13 | 18:02 | 11 h 38 min | 60.9° |
| November | 06:38 | 12:14 | 17:50 | 11 h 13 min | 51.8° |
| December | 06:55 | 12:26 | 17:57 | 11 h 02 min | 48.4° |
A year of daylight in Mayagüez
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 Mayagüez
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: 1667 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% | 3.56 | 1.5× |
| 15° | 1665 | 100% | 4.12 | 1.2× |
| 18° year-round best = latitude | 1667 | 100% | 4.20 | 1.2× |
| 22° off-grid best | 1663 | 100% | 4.29 | 1.2× |
| 30° | 1635 | 98% | 4.43 | 1.3× |
| 45° | 1512 | 91% | 4.48 | 1.5× |
| 60° | 1305 | 78% | 4.26 | 2.0× |
| 70° | 1131 | 68% | 3.97 | 2.5× |
| 90° | 767 | 46% | 3.09 | 3.2× |
A fixed array in Mayagüez produces the most over a year at 18°. The design month for an off-grid system is November: at 22° it makes 4.29 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 Mayagüez 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 | 4.63 | 5.36 | 4.39 | 4.42 | 25.8 °C |
| February | 5.39 | 5.11 | 4.18 | 4.86 | 25.6 °C |
| March | 5.99 | 4.32 | 3.53 | 5.04 | 25.7 °C |
| April | 6.36 | 3.22 | 2.61 | 4.97 | 26.3 °C |
| May | 6.09 | 2.44 | 1.94 | 4.52 | 27.1 °C |
| June | 6.11 | 2.20 | 1.74 | 4.43 | 27.9 °C |
| July | 6.13 | 2.28 | 1.81 | 4.48 | 28.2 °C |
| August | 6.08 | 2.81 | 2.25 | 4.62 | 28.5 °C |
| September | 5.72 | 3.64 | 2.93 | 4.61 | 28.5 °C |
| October | 5.14 | 4.36 | 3.52 | 4.43 | 28.3 °C |
| November | 4.54 | 4.89 | 3.97 | 4.20 | 27.4 °C |
| December | 4.38 | 5.36 | 4.37 | 4.24 | 26.6 °C |
| Year | 5.55 avg | 3.83 avg | 1131 kWh | 1667 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 Mayagüez
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.
2.6 mrow pitch at 70°
2.5 mrow pitch at 18°
How Mayagüez compares in Puerto Rico
Against the other 20 places in Puerto Rico with climate data, for a fixed array at its best angle.
2ndof 21 places in Puerto Rico for sunshine, shared: 5.55 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Puerto Rico: 1,667 against 1,627 kWh per kWp.
−1 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); Mayagüez ranks joint 2nd. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.74 kWh a day here, against 1.75 kWh on average in Puerto Rico. The shortest day lasts 11 h 02 min, +1 min compared with San Juan.
Solar forecast for Mayagüez, 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 Mayagüez
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Places near Mayagüez
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A free, live card for Mayagüez: 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.