Morelos · Mexico · 18.87° N · 99.21° W
Solar position in Tres de Mayo
Sun position, daylight and the best solar panel angle for Tres de Mayo — computed for 18.87° N, 99.21° W, 1379 m above sea level.
The sun right now
Sun in Tres de Mayo today
Saturday, 24 October 2026 · local time UTC−6
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:20 | sun 18° below horizon |
| Nautical dawn | 05:45 | 12° below |
| Civil dawn | 06:11 | 6° below |
| Sunrise | 06:33 | 102° ESE |
| Golden hour ends | 07:03 | sun 6° up |
| Solar noon | 12:20 | 59.2° high |
| Golden hour starts | 17:38 | sun 6° up |
| Sunset | 18:07 | 258° WSW |
| Civil dusk | 18:30 | 6° below |
| Nautical dusk | 18:55 | 12° below |
| Astronomical dusk | 19:21 | 18° below |
| Day length | 11 h 34 min | |
Sun path diagram for Tres de Mayo
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 85.4° at solar noon in Tres de Mayo; on the December solstice only 47.7°. Sunrise swings from 65° ENE in June to 115° ESE in December — a 50° 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 | 07:12 | 12:48 | 18:23 | 11 h 11 min | 51.4° |
| February | 07:01 | 12:50 | 18:39 | 11 h 38 min | 60.8° |
| March | 06:39 | 12:43 | 18:48 | 12 h 08 min | 71.6° |
| April | 06:15 | 12:35 | 18:55 | 12 h 41 min | 83.2° |
| May | 06:00 | 12:33 | 19:06 | 13 h 06 min | 88.6° |
| June | 06:00 | 12:38 | 19:16 | 13 h 16 min | 85.4° |
| July | 06:10 | 12:43 | 19:16 | 13 h 06 min | 88.5° |
| August | 06:19 | 12:39 | 18:59 | 12 h 40 min | 83.0° |
| September | 06:25 | 12:29 | 18:33 | 12 h 08 min | 71.6° |
| October | 06:32 | 12:21 | 18:09 | 11 h 37 min | 60.2° |
| November | 06:47 | 12:22 | 17:57 | 11 h 10 min | 51.1° |
| December | 07:05 | 12:35 | 18:04 | 11 h 00 min | 47.7° |
A year of daylight in Tres de Mayo
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 Tres de Mayo
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
20°collects the most energy over a year: 1837 kWh per kWp.
14°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° | 1741 | 95% | 4.93 | 1.4× |
| 14° off-grid best | 1828 | 100% | 4.63 | 1.3× |
| 15° | 1831 | 100% | 4.60 | 1.3× |
| 19° = latitude | 1836 | 100% | 4.47 | 1.3× |
| 20° year-round best | 1837 | 100% | 4.43 | 1.3× |
| 30° | 1813 | 99% | 4.02 | 1.4× |
| 45° | 1690 | 92% | 3.23 | 1.8× |
| 60° | 1472 | 80% | 2.33 | 2.4× |
| 70° | 1284 | 70% | 1.72 | 3.2× |
| 90° | 880 | 48% | 1.12 | 4.1× |
A fixed array in Tres de Mayo produces the most over a year at 20°. The design month for an off-grid system is June: at 14° it makes 4.63 kWh per kWp a day, 4% more than at 20°, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Tres de Mayo at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 20° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 20° | Mean temp. |
|---|---|---|---|---|---|
| January | 5.01 | 6.11 | 5.21 | 5.16 | 15.3 °C |
| February | 5.86 | 5.79 | 4.90 | 5.60 | 17.1 °C |
| March | 6.63 | 4.85 | 4.08 | 5.79 | 19.0 °C |
| April | 6.95 | 3.42 | 2.83 | 5.50 | 21.2 °C |
| May | 6.52 | 2.48 | 2.03 | 4.86 | 21.6 °C |
| June | 6.05 | 2.11 | 1.72 | 4.43 | 19.9 °C |
| July | 6.14 | 2.25 | 1.85 | 4.57 | 18.7 °C |
| August | 6.05 | 2.83 | 2.35 | 4.74 | 18.5 °C |
| September | 5.39 | 3.50 | 2.94 | 4.53 | 17.9 °C |
| October | 5.38 | 4.68 | 3.96 | 4.92 | 17.2 °C |
| November | 5.13 | 5.88 | 5.00 | 5.16 | 16.0 °C |
| December | 4.90 | 6.37 | 5.42 | 5.16 | 15.4 °C |
| Year | 5.83 avg | 4.18 avg | 1284 kWh | 1837 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 690 Wp of panels at 70°, versus 270 Wp at 20°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Tres de Mayo
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.
2.6 mrow pitch at 70°
2.6 mrow pitch at 20°
How Tres de Mayo compares in Mexico
Against the other 624 places in Mexico with climate data, for a fixed array at its best angle.
189thof 625 places in Mexico for sunshine, shared: 5.83 peak sun hours a day on flat ground.
+5%solar energy a year compared with the average place in Mexico: 1,837 against 1,754 kWh per kWp.
−2 mindaylight on the longest day, compared with Mexico City: 13 h 16 min against 13 h 18 min.
20°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); Tres de Mayo ranks joint 189th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.72 kWh a day here, against 1.82 kWh on average in Mexico. The shortest day lasts 11 h 00 min, +2 min compared with Mexico City.
Solar forecast for Tres de Mayo, 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 Tres de Mayo
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Places near Tres de Mayo
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A free, live card for Tres de Mayo: 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.