Piura · Peru · 5.40° S · 80.74° W
Solar position in La Unión
Sun position, daylight and the best solar panel angle for La Unión — computed for 5.40° S, 80.74° W, 15 m above sea level.
The sun right now
Sun in La Unión today
Saturday, 24 October 2026 · local time UTC−5
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:48 | sun 18° below horizon |
| Nautical dawn | 05:13 | 12° below |
| Civil dawn | 05:37 | 6° below |
| Sunrise | 05:59 | 102° ESE |
| Golden hour ends | 06:27 | sun 6° up |
| Solar noon | 12:07 | 83.5° high |
| Golden hour starts | 17:47 | sun 6° up |
| Sunset | 18:15 | 258° WSW |
| Civil dusk | 18:36 | 6° below |
| Nautical dusk | 19:01 | 12° below |
| Astronomical dusk | 19:25 | 18° below |
| Day length | 12 h 16 min | |
Sun path diagram for La Unión
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 61.2° at solar noon in La Unión; on the December solstice only 72.0°. Sunrise swings from 67° ENE in June to 114° ESE in December — a 47° 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 | 06:22 | 12:34 | 18:45 | 12 h 23 min | 75.6° |
| February | 06:29 | 12:36 | 18:43 | 12 h 15 min | 85.0° |
| March | 06:26 | 12:30 | 18:33 | 12 h 06 min | 84.2° |
| April | 06:22 | 12:21 | 18:20 | 11 h 57 min | 72.6° |
| May | 06:23 | 12:19 | 18:15 | 11 h 51 min | 64.3° |
| June | 06:30 | 12:24 | 18:19 | 11 h 49 min | 61.2° |
| July | 06:33 | 12:29 | 18:24 | 11 h 51 min | 64.2° |
| August | 06:27 | 12:26 | 18:24 | 11 h 58 min | 72.7° |
| September | 06:12 | 12:15 | 18:19 | 12 h 06 min | 84.1° |
| October | 06:00 | 12:07 | 18:15 | 12 h 15 min | 84.5° |
| November | 05:57 | 12:08 | 18:20 | 12 h 23 min | 75.4° |
| December | 06:07 | 12:21 | 18:34 | 12 h 26 min | 72.0° |
A year of daylight in La Unión
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 La Unión
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
5°collects the most energy over a year: 1644 kWh per kWp.
16°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 | June kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1639 | 100% | 3.73 | 1.3× |
| 5° year-round best = latitude | 1644 | 100% | 3.90 | 1.2× |
| 15° | 1622 | 99% | 4.15 | 1.2× |
| 16° off-grid best | 1618 | 98% | 4.17 | 1.2× |
| 30° | 1513 | 92% | 4.33 | 1.4× |
| 45° | 1319 | 80% | 4.25 | 1.9× |
| 60° | 1059 | 64% | 3.93 | 2.9× |
| 70° | 873 | 53% | 3.59 | 3.7× |
| 90° | 579 | 35% | 2.63 | 2.7× |
A fixed array in La Unión produces the most over a year at 5°. The design month for an off-grid system is June: at 16° it makes 4.17 kWh per kWp a day, 7% more than at 5°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in La Unión at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 5° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 5° | Mean temp. |
|---|---|---|---|---|---|
| January | 5.88 | 1.35 | 1.05 | 4.55 | 25.7 °C |
| February | 5.63 | 1.89 | 1.50 | 4.40 | 26.9 °C |
| March | 5.81 | 2.83 | 2.28 | 4.62 | 26.9 °C |
| April | 5.87 | 4.01 | 3.27 | 4.78 | 25.6 °C |
| May | 5.26 | 4.47 | 3.68 | 4.36 | 24.1 °C |
| June | 4.65 | 4.33 | 3.59 | 3.90 | 22.6 °C |
| July | 4.65 | 4.16 | 3.45 | 3.90 | 21.7 °C |
| August | 5.13 | 3.87 | 3.21 | 4.27 | 21.4 °C |
| September | 5.84 | 3.24 | 2.68 | 4.79 | 21.5 °C |
| October | 6.07 | 2.20 | 1.79 | 4.87 | 21.9 °C |
| November | 6.19 | 1.44 | 1.14 | 4.86 | 22.7 °C |
| December | 6.12 | 1.28 | 1.00 | 4.74 | 24.1 °C |
| Year | 5.59 avg | 2.93 avg | 873 kWh | 1644 kWh |
Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 1,170 Wp of panels at 70°, versus 300 Wp at 5°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in La Unión
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.
1.9 mrow pitch at 70°
2.1 mrow pitch at 5°
How La Unión compares in Peru
Against the other 135 places in Peru with climate data, for a fixed array at its best angle.
27thof 136 places in Peru for sunshine: 5.59 peak sun hours a day on flat ground.
+2%solar energy a year compared with the average place in Peru: 1,644 against 1,605 kWh per kWp.
−24 mindaylight on the longest day, compared with Lima: 12 h 26 min against 12 h 50 min.
5°best year-round tilt here; across Peru it runs from 3° in Tumbes to 19° in Arequipa.
Of the 136 places in Peru, Ciudad Satelite and one other place get the most sun (6.60 peak sun hours a day) and La Peca the least (4.16); La Unión ranks 27th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.00 kWh a day here, against 1.33 kWh on average in Peru. The shortest day lasts 11 h 49 min, +24 min compared with Lima.
Solar forecast for La Unión, 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 La Unión
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Places near La Unión
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A free, live card for La Unión: 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.