Buenos Aires · Argentina · 34.06° S · 60.10° W
Solar position in Arrecifes
Sun position, daylight and the best solar panel angle for Arrecifes — computed for 34.06° S, 60.10° W, 28 m above sea level.
The sun right now
Sun in Arrecifes today
Saturday, 24 October 2026 · local time UTC−3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:38 | sun 18° below horizon |
| Nautical dawn | 05:10 | 12° below |
| Civil dawn | 05:41 | 6° below |
| Sunrise | 06:07 | 105° ESE |
| Golden hour ends | 06:41 | sun 6° up |
| Solar noon | 12:44 | 67.9° high |
| Golden hour starts | 18:47 | sun 6° up |
| Sunset | 19:21 | 255° WSW |
| Civil dusk | 19:47 | 6° below |
| Nautical dusk | 20:18 | 12° below |
| Astronomical dusk | 20:51 | 18° below |
| Day length | 13 h 14 min | |
Sun path diagram for Arrecifes
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 32.5° at solar noon in Arrecifes; on the December solstice only 79.4°. 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 | 06:10 | 13:11 | 20:12 | 14 h 02 min | 75.7° |
| February | 06:41 | 13:13 | 19:46 | 13 h 05 min | 66.3° |
| March | 07:04 | 13:07 | 19:10 | 12 h 06 min | 55.5° |
| April | 07:27 | 12:58 | 18:29 | 11 h 02 min | 43.9° |
| May | 07:50 | 12:56 | 18:03 | 10 h 13 min | 35.7° |
| June | 08:05 | 13:02 | 17:58 | 9 h 53 min | 32.5° |
| July | 08:00 | 13:07 | 18:13 | 10 h 13 min | 35.6° |
| August | 07:32 | 13:03 | 18:34 | 11 h 02 min | 44.0° |
| September | 06:51 | 12:53 | 18:56 | 12 h 05 min | 55.4° |
| October | 06:11 | 12:45 | 19:19 | 13 h 08 min | 66.8° |
| November | 05:45 | 12:46 | 19:48 | 14 h 03 min | 75.9° |
| December | 05:45 | 12:58 | 20:11 | 14 h 26 min | 79.4° |
A year of daylight in Arrecifes
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 Arrecifes
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: 1624 kWh per kWp.
60°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° | 1436 | 88% | 1.89 | 3.2× |
| 15° | 1577 | 97% | 2.57 | 2.3× |
| 30° year-round best | 1624 | 100% | 3.08 | 1.7× |
| 34° = latitude | 1620 | 100% | 3.19 | 1.6× |
| 45° | 1574 | 97% | 3.40 | 1.4× |
| 60° off-grid best | 1433 | 88% | 3.51 | 1.2× |
| 70° | 1293 | 80% | 3.45 | 1.4× |
| 90° | 932 | 57% | 3.06 | 2.3× |
A fixed array in Arrecifes produces the most over a year at 30°. The design month for an off-grid system is June: at 60° it makes 3.51 kWh per kWp a day, 14% more than at 30°, and costs 12% of the yearly total. Why steep panels win winter.
Off-grid solar in Arrecifes 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 | 7.23 | 3.68 | 3.00 | 5.34 | 24.7 °C |
| February | 6.31 | 4.22 | 3.47 | 5.16 | 23.2 °C |
| March | 5.24 | 4.73 | 3.94 | 4.88 | 20.6 °C |
| April | 3.87 | 4.75 | 4.03 | 4.21 | 16.7 °C |
| May | 2.81 | 4.21 | 3.62 | 3.42 | 12.9 °C |
| June | 2.34 | 3.96 | 3.45 | 3.08 | 9.7 °C |
| July | 2.52 | 4.00 | 3.49 | 3.21 | 9.0 °C |
| August | 3.43 | 4.57 | 3.96 | 3.96 | 11.0 °C |
| September | 4.60 | 4.66 | 4.00 | 4.61 | 13.6 °C |
| October | 5.63 | 4.21 | 3.55 | 4.92 | 17.0 °C |
| November | 6.85 | 3.78 | 3.14 | 5.29 | 20.5 °C |
| December | 7.42 | 3.50 | 2.87 | 5.37 | 23.1 °C |
| Year | 4.85 avg | 4.19 avg | 1293 kWh | 1624 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 380 Wp at 30°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Arrecifes
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.
4.0 mrow pitch at 70°
3.5 mrow pitch at 30°
How Arrecifes compares in Argentina
Against the other 313 places in Argentina with climate data, for a fixed array at its best angle.
172ndof 314 places in Argentina for sunshine, shared: 4.85 peak sun hours a day on flat ground.
−1%solar energy a year compared with the average place in Argentina: 1,624 against 1,639 kWh per kWp.
−3 mindaylight on the longest day, compared with Buenos Aires: 14 h 26 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); Arrecifes ranks joint 172nd. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.87 kWh a day here, against 2.68 kWh on average in Argentina. The shortest day lasts 9 h 53 min, +3 min compared with Buenos Aires.
Solar forecast for Arrecifes, 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 Arrecifes
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Places near Arrecifes
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A free, live card for Arrecifes: 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.