Loreto · Peru · 3.78° S · 73.28° W
Solar position in San Juan
Sun position, daylight and the best solar panel angle for San Juan — computed for 3.78° S, 73.28° W, 99 m above sea level.
The sun right now
Sun in San Juan today
Saturday, 24 October 2026 · local time UTC−5
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:20 | sun 18° below horizon |
| Nautical dawn | 04:44 | 12° below |
| Civil dawn | 05:09 | 6° below |
| Sunrise | 05:30 | 102° ESE |
| Golden hour ends | 05:58 | sun 6° up |
| Solar noon | 11:37 | 81.9° high |
| Golden hour starts | 17:15 | sun 6° up |
| Sunset | 17:43 | 258° WSW |
| Civil dusk | 18:05 | 6° below |
| Nautical dusk | 18:29 | 12° below |
| Astronomical dusk | 18:54 | 18° below |
| Day length | 12 h 13 min | |
Sun path diagram for San Juan
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 62.8° at solar noon in San Juan; on the December solstice only 70.3°. 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 | 05:55 | 12:04 | 18:13 | 12 h 18 min | 74.0° |
| February | 06:00 | 12:06 | 18:12 | 12 h 12 min | 83.4° |
| March | 05:57 | 12:00 | 18:03 | 12 h 06 min | 85.8° |
| April | 05:51 | 11:51 | 17:51 | 12 h 00 min | 74.2° |
| May | 05:51 | 11:49 | 17:47 | 11 h 56 min | 65.9° |
| June | 05:57 | 11:54 | 17:52 | 11 h 54 min | 62.8° |
| July | 06:01 | 11:59 | 17:57 | 11 h 56 min | 65.9° |
| August | 05:56 | 11:56 | 17:56 | 12 h 00 min | 74.3° |
| September | 05:43 | 11:46 | 17:49 | 12 h 06 min | 85.7° |
| October | 05:31 | 11:37 | 17:44 | 12 h 13 min | 82.9° |
| November | 05:29 | 11:38 | 17:48 | 12 h 18 min | 73.8° |
| December | 05:40 | 11:51 | 18:01 | 12 h 21 min | 70.3° |
A year of daylight in San Juan
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 San Juan
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
4°collects the most energy over a year: 1318 kWh per kWp.
8°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° | 1315 | 100% | 3.27 | 1.2× |
| 4° year-round best = latitude | 1318 | 100% | 3.36 | 1.2× |
| 8° off-grid best | 1316 | 100% | 3.44 | 1.2× |
| 15° | 1301 | 99% | 3.54 | 1.2× |
| 30° | 1218 | 92% | 3.62 | 1.4× |
| 45° | 1073 | 81% | 3.51 | 1.7× |
| 60° | 880 | 67% | 3.20 | 2.3× |
| 70° | 742 | 56% | 2.90 | 2.5× |
| 90° | 512 | 39% | 2.11 | 2.1× |
A fixed array in San Juan produces the most over a year at 4°. The design month for an off-grid system is June: at 8° it makes 3.44 kWh per kWp a day, 2% more than at 4°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in San Juan at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 4° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 4° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.53 | 1.48 | 1.16 | 3.53 | 25.6 °C |
| February | 4.50 | 1.83 | 1.45 | 3.54 | 25.7 °C |
| March | 4.48 | 2.35 | 1.89 | 3.56 | 25.6 °C |
| April | 4.40 | 2.93 | 2.37 | 3.54 | 25.5 °C |
| May | 4.16 | 3.28 | 2.67 | 3.37 | 25.3 °C |
| June | 4.12 | 3.55 | 2.90 | 3.36 | 24.9 °C |
| July | 4.27 | 3.58 | 2.93 | 3.49 | 24.8 °C |
| August | 4.67 | 3.37 | 2.75 | 3.79 | 25.3 °C |
| September | 5.02 | 2.80 | 2.26 | 4.02 | 25.7 °C |
| October | 4.93 | 2.03 | 1.62 | 3.90 | 25.8 °C |
| November | 4.74 | 1.51 | 1.19 | 3.70 | 25.8 °C |
| December | 4.56 | 1.48 | 1.16 | 3.54 | 25.6 °C |
| Year | 4.53 avg | 2.52 avg | 742 kWh | 1318 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 1,020 Wp of panels at 70°, versus 350 Wp at 4°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in San Juan
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.
1.8 mrow pitch at 70°
2.1 mrow pitch at 4°
How San Juan compares in Peru
Against the other 135 places in Peru with climate data, for a fixed array at its best angle.
117thof 136 places in Peru for sunshine, shared: 4.53 peak sun hours a day on flat ground.
−18%solar energy a year compared with the average place in Peru: 1,318 against 1,605 kWh per kWp.
−30 mindaylight on the longest day, compared with Lima: 12 h 21 min against 12 h 50 min.
4°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); San Juan ranks joint 117th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.16 kWh a day here, against 1.33 kWh on average in Peru. The shortest day lasts 11 h 54 min, +29 min compared with Lima.
Solar forecast for San Juan, 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 San Juan
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Places near San Juan
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A free, live card for San Juan: 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.