Argentina · 33.29° S · 66.32° W
Solar position in San Luis
Sun position, daylight and the best solar panel angle for San Luis — computed for 33.29° S, 66.32° W, 729 m above sea level.
The sun right now
Sun in San Luis today
Saturday, 24 October 2026 · local time UTC−3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:05 | sun 18° below horizon |
| Nautical dawn | 05:37 | 12° below |
| Civil dawn | 06:08 | 6° below |
| Sunrise | 06:33 | 105° ESE |
| Golden hour ends | 07:07 | sun 6° up |
| Solar noon | 13:09 | 68.6° high |
| Golden hour starts | 19:12 | sun 6° up |
| Sunset | 19:45 | 255° WSW |
| Civil dusk | 20:11 | 6° below |
| Nautical dusk | 20:42 | 12° below |
| Astronomical dusk | 21:14 | 18° below |
| Day length | 13 h 12 min | |
Sun path diagram for San Luis
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 33.3° at solar noon in San Luis; on the December solstice only 80.1°. Sunrise swings from 62° ENE in June to 119° ESE in December — a 57° 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 | 06:37 | 13:36 | 20:35 | 13 h 58 min | 76.5° |
| February | 07:06 | 13:38 | 20:10 | 13 h 03 min | 67.1° |
| March | 07:29 | 13:32 | 19:34 | 12 h 06 min | 56.3° |
| April | 07:51 | 13:23 | 18:55 | 11 h 04 min | 44.7° |
| May | 08:13 | 13:21 | 18:29 | 10 h 16 min | 36.4° |
| June | 08:28 | 13:27 | 18:25 | 9 h 57 min | 33.3° |
| July | 08:23 | 13:31 | 18:39 | 10 h 16 min | 36.4° |
| August | 07:56 | 13:28 | 19:00 | 11 h 04 min | 44.8° |
| September | 07:16 | 13:18 | 19:21 | 12 h 05 min | 56.2° |
| October | 06:37 | 13:10 | 19:43 | 13 h 06 min | 67.6° |
| November | 06:11 | 13:11 | 20:11 | 14 h 00 min | 76.7° |
| December | 06:12 | 13:23 | 20:34 | 14 h 22 min | 80.1° |
A year of daylight in San Luis
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 Luis
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
30°collects the most energy over a year: 1781 kWh per kWp.
55°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 | May kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1564 | 88% | 2.43 | 2.8× |
| 15° | 1725 | 97% | 3.13 | 2.0× |
| 30° year-round best | 1781 | 100% | 3.64 | 1.6× |
| 33° = latitude | 1779 | 100% | 3.71 | 1.5× |
| 45° | 1729 | 97% | 3.92 | 1.3× |
| 55° off-grid best | 1637 | 92% | 3.97 | 1.3× |
| 60° | 1575 | 88% | 3.96 | 1.3× |
| 70° | 1421 | 80% | 3.84 | 1.7× |
| 90° | 1022 | 57% | 3.30 | 3.0× |
A fixed array in San Luis produces the most over a year at 30°. The design month for an off-grid system is May: at 55° it makes 3.97 kWh per kWp a day, 9% more than at 30°, and costs 8% of the yearly total. Why steep panels win winter.
Off-grid solar in San Luis at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 30° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 30° | Mean temp. |
|---|---|---|---|---|---|
| January | 7.69 | 3.72 | 3.03 | 5.58 | 25.2 °C |
| February | 6.67 | 4.33 | 3.56 | 5.40 | 23.8 °C |
| March | 5.44 | 4.86 | 4.05 | 5.05 | 21.1 °C |
| April | 4.04 | 4.94 | 4.19 | 4.39 | 16.7 °C |
| May | 2.99 | 4.45 | 3.84 | 3.64 | 12.4 °C |
| June | 2.77 | 4.88 | 4.27 | 3.77 | 9.2 °C |
| July | 3.01 | 5.04 | 4.41 | 3.99 | 8.5 °C |
| August | 3.99 | 5.51 | 4.78 | 4.73 | 11.0 °C |
| September | 5.19 | 5.31 | 4.54 | 5.24 | 14.4 °C |
| October | 6.34 | 4.63 | 3.90 | 5.48 | 18.5 °C |
| November | 7.48 | 3.94 | 3.26 | 5.67 | 21.9 °C |
| December | 7.96 | 3.53 | 2.89 | 5.64 | 24.1 °C |
| Year | 5.29 avg | 4.60 avg | 1421 kWh | 1781 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 410 Wp of panels at 70°, versus 320 Wp at 30°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in San Luis
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.
3.9 mrow pitch at 70°
3.5 mrow pitch at 30°
How San Luis compares in Argentina
Against the other 313 places in Argentina with climate data, for a fixed array at its best angle.
32ndof 314 places in Argentina for sunshine, shared: 5.29 peak sun hours a day on flat ground.
+9%solar energy a year compared with the average place in Argentina: 1,781 against 1,639 kWh per kWp.
−7 mindaylight on the longest day, compared with Buenos Aires: 14 h 22 min against 14 h 29 min.
30°best year-round tilt here; across Argentina it runs from 21° in Tartagal to 44° in Río Gallegos.
Of the 314 places in Argentina, Belén gets the most sun (6.11 peak sun hours a day) and Ushuaia the least (2.59); San Luis ranks joint 32nd. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.89 kWh a day here, against 2.68 kWh on average in Argentina. The shortest day lasts 9 h 57 min, +7 min compared with Buenos Aires.
Solar forecast for San Luis, 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 Luis
What is the best solar panel angle in San Luis?
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Places near San Luis
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A free, live card for San Luis: 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.