Sonora · Mexico · 32.46° N · 114.77° W
Solar position in San Luis Río Colorado
Sun position, daylight and the best solar panel angle for San Luis Río Colorado — computed for 32.46° N, 114.77° W, 36 m above sea level.
The sun right now
Sun in San Luis Río Colorado 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 | 06:49 | 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 Río Colorado
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 Río Colorado; 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 | 77.9° |
| June | 05:32 | 12:40 | 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 | 69.5° |
| 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 Río Colorado
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 Río Colorado
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.
40°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° | 1722 | 88% | 2.61 | 2.5× |
| 15° | 1903 | 97% | 3.63 | 1.8× |
| 30° year-round best | 1966 | 100% | 4.41 | 1.4× |
| 32° = latitude | 1965 | 100% | 4.49 | 1.4× |
| 40° off-grid best | 1942 | 99% | 4.77 | 1.2× |
| 45° | 1909 | 97% | 4.89 | 1.3× |
| 60° | 1738 | 88% | 5.06 | 1.5× |
| 70° | 1566 | 80% | 4.99 | 1.9× |
| 90° | 1119 | 57% | 4.44 | 4.0× |
A fixed array in San Luis Río Colorado produces the most over a year at 30°. The design month for an off-grid system is December: at 40° it makes 4.77 kWh per kWp a day, 8% more than at 30°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in San Luis Río Colorado 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 | 3.62 | 6.12 | 5.26 | 4.76 | 12.7 °C |
| February | 4.59 | 6.06 | 5.18 | 5.25 | 14.4 °C |
| March | 6.00 | 5.95 | 5.01 | 5.90 | 18.0 °C |
| April | 7.33 | 5.02 | 4.17 | 6.14 | 21.1 °C |
| May | 8.14 | 4.01 | 3.27 | 5.97 | 25.3 °C |
| June | 8.41 | 3.46 | 2.76 | 5.69 | 30.4 °C |
| July | 7.66 | 3.54 | 2.78 | 5.30 | 33.6 °C |
| August | 7.15 | 4.30 | 3.39 | 5.42 | 33.5 °C |
| September | 6.27 | 5.41 | 4.33 | 5.53 | 30.6 °C |
| October | 5.13 | 6.25 | 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 | 4.41 | 12.2 °C |
| Year | 5.96 avg | 5.17 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 Río Colorado
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 Río Colorado compares in Mexico
Against the other 624 places in Mexico with climate data, for a fixed array at its best angle.
58thof 625 places in Mexico for sunshine, shared: 5.96 peak sun hours a day on flat ground.
+12%solar energy a year compared with the average place in Mexico: 1,966 against 1,754 kWh per kWp.
+59 mindaylight on the longest day, compared with Mexico City: 14 h 17 min against 13 h 18 min.
30°best year-round tilt here; across Mexico it runs from 15° in Coatzacoalcos to 30° in Tijuana.
Of the 625 places in Mexico, Ciudad Constitución gets the most sun (6.12 peak sun hours a day) and Poza Rica de Hidalgo and one other place the least (4.59); San Luis Río Colorado ranks joint 58th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.76 kWh a day here, against 1.82 kWh on average in Mexico. The shortest day lasts 10 h 01 min, −57 min compared with Mexico City.
Solar forecast for San Luis Río Colorado, 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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A free, live card for San Luis Río Colorado: 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.