Arizona · United States · 32.49° N · 114.78° W
Solar position in San Luis
Sun position, daylight and the best solar panel angle for San Luis — computed for 32.49° N, 114.78° W, 40 m above sea level.
The sun right now
Sun in San Luis today
Saturday, 24 October 2026 · local time UTC−7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:27 | sun 18° below horizon |
| Nautical dawn | 05:56 | 12° below |
| Civil dawn | 06:24 | 6° below |
| Sunrise | 06:50 | 104° ESE |
| Golden hour ends | 07:23 | sun 6° up |
| Solar noon | 12:23 | 45.6° high |
| Golden hour starts | 17:22 | sun 6° up |
| Sunset | 17:56 | 256° WSW |
| Civil dusk | 18:21 | 6° below |
| Nautical dusk | 18:49 | 12° below |
| Astronomical dusk | 19:18 | 18° below |
| Day length | 11 h 06 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 81.0° at solar noon in San Luis; on the December solstice only 34.1°. Sunrise swings from 61° ENE in June to 118° ESE in December — a 56° 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 | 07:39 | 12:50 | 18:02 | 10 h 23 min | 37.8° |
| February | 07:15 | 12:52 | 18:30 | 11 h 15 min | 47.2° |
| March | 06:41 | 12:46 | 18:51 | 12 h 10 min | 58.0° |
| April | 06:02 | 12:37 | 19:13 | 13 h 11 min | 69.6° |
| May | 05:37 | 12:35 | 19:34 | 13 h 58 min | 77.8° |
| June | 05:32 | 12:41 | 19:49 | 14 h 17 min | 81.0° |
| July | 05:46 | 12:45 | 19:44 | 13 h 58 min | 77.9° |
| August | 06:07 | 12:42 | 19:16 | 13 h 10 min | 69.4° |
| September | 06:26 | 12:31 | 18:36 | 12 h 10 min | 58.0° |
| October | 06:47 | 12:23 | 17:59 | 11 h 12 min | 46.6° |
| November | 07:14 | 12:24 | 17:35 | 10 h 21 min | 37.5° |
| December | 07:36 | 12:37 | 17:37 | 10 h 01 min | 34.1° |
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 south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
30°collects the most energy over a year: 1966 kWh per kWp.
41°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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1721 | 88% | 2.61 | 2.5× |
| 15° | 1903 | 97% | 3.63 | 1.8× |
| 30° year-round best | 1966 | 100% | 4.40 | 1.4× |
| 32° = latitude | 1965 | 100% | 4.49 | 1.4× |
| 41° off-grid best | 1936 | 98% | 4.79 | 1.2× |
| 45° | 1910 | 97% | 4.89 | 1.3× |
| 60° | 1738 | 88% | 5.06 | 1.5× |
| 70° | 1566 | 80% | 4.99 | 1.9× |
| 90° | 1119 | 57% | 4.43 | 4.0× |
A fixed array in San Luis produces the most over a year at 30°. The design month for an off-grid system is December: at 41° it makes 4.79 kWh per kWp a day, 9% more than at 30°, and costs 2% 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 | 3.61 | 6.11 | 5.26 | 4.76 | 12.7 °C |
| February | 4.59 | 6.06 | 5.18 | 5.24 | 14.4 °C |
| March | 6.00 | 5.95 | 5.01 | 5.90 | 18.0 °C |
| April | 7.33 | 5.02 | 4.17 | 6.14 | 21.2 °C |
| May | 8.14 | 4.02 | 3.28 | 5.97 | 25.4 °C |
| June | 8.41 | 3.47 | 2.76 | 5.69 | 30.5 °C |
| July | 7.67 | 3.55 | 2.79 | 5.30 | 33.7 °C |
| August | 7.15 | 4.30 | 3.39 | 5.42 | 33.6 °C |
| September | 6.28 | 5.42 | 4.33 | 5.53 | 30.7 °C |
| October | 5.13 | 6.26 | 5.14 | 5.43 | 24.2 °C |
| November | 3.89 | 6.24 | 5.25 | 4.87 | 17.8 °C |
| December | 3.24 | 5.79 | 4.99 | 4.40 | 12.2 °C |
| Year | 5.96 avg | 5.18 avg | 1566 kWh | 1966 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 430 Wp of panels at 70°, versus 270 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.
3.8 mrow pitch at 70°
3.4 mrow pitch at 30°
How San Luis compares in the United States
Against the other 3,120 places in the United States with climate data, for a fixed array at its best angle.
1stof 3,121 places in the United States for sunshine, shared: 5.96 peak sun hours a day on flat ground.
+30%solar energy a year compared with the average place in the United States: 1,966 against 1,515 kWh per kWp.
−48 mindaylight on the longest day, compared with New York City: 14 h 17 min against 15 h 06 min.
30°best year-round tilt here; across the United States it runs from 18° in Honolulu to 53° in Fairbanks.
San Luis shares the top spot for sunshine among the 3,121 places in the United States (5.96 peak sun hours a day); the least sunny is Juneau with 2.38. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.76 kWh a day here, against 2.55 kWh on average in the United States. The shortest day lasts 10 h 01 min, +46 min compared with New York City.
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
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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.