Rio Grande do Sul · Brazil · 28.66° S · 56.00° W
Solar position in São Borja
Sun position, daylight and the best solar panel angle for São Borja — computed for 28.66° S, 56.00° W, 98 m above sea level.
The sun right now
Sun in São Borja today
Saturday, 24 October 2026 · local time UTC−3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:35 | sun 18° below horizon |
| Nautical dawn | 05:04 | 12° below |
| Civil dawn | 05:33 | 6° below |
| Sunrise | 05:58 | 104° ESE |
| Golden hour ends | 06:29 | sun 6° up |
| Solar noon | 12:28 | 73.2° high |
| Golden hour starts | 18:26 | sun 6° up |
| Sunset | 18:58 | 256° WSW |
| Civil dusk | 19:23 | 6° below |
| Nautical dusk | 19:52 | 12° below |
| Astronomical dusk | 20:21 | 18° below |
| Day length | 13 h 01 min | |
Sun path diagram for São Borja
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 37.9° at solar noon in São Borja; on the December solstice only 84.8°. Sunrise swings from 64° ENE in June to 117° ESE in December — a 54° 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 | 06:05 | 12:55 | 19:44 | 13 h 39 min | 81.1° |
| February | 06:30 | 12:57 | 19:24 | 12 h 54 min | 71.7° |
| March | 06:48 | 12:50 | 18:53 | 12 h 06 min | 60.9° |
| April | 07:05 | 12:42 | 18:19 | 11 h 14 min | 49.3° |
| May | 07:22 | 12:40 | 17:58 | 10 h 35 min | 41.1° |
| June | 07:36 | 12:45 | 17:55 | 10 h 19 min | 37.9° |
| July | 07:33 | 12:50 | 18:07 | 10 h 35 min | 41.0° |
| August | 07:10 | 12:47 | 18:24 | 11 h 15 min | 49.4° |
| September | 06:34 | 12:37 | 18:39 | 12 h 05 min | 60.8° |
| October | 06:00 | 12:28 | 18:56 | 12 h 56 min | 72.2° |
| November | 05:39 | 12:29 | 19:20 | 13 h 40 min | 81.3° |
| December | 05:42 | 12:42 | 19:41 | 13 h 58 min | 84.8° |
A year of daylight in São Borja
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 São Borja
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
25°collects the most energy over a year: 1545 kWh per kWp.
54°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° | 1418 | 92% | 2.09 | 2.7× |
| 15° | 1524 | 99% | 2.67 | 2.0× |
| 25° year-round best | 1545 | 100% | 2.96 | 1.7× |
| 29° = latitude | 1542 | 100% | 3.06 | 1.6× |
| 30° | 1540 | 100% | 3.08 | 1.6× |
| 45° | 1465 | 95% | 3.30 | 1.4× |
| 54° off-grid best | 1380 | 89% | 3.34 | 1.3× |
| 60° | 1307 | 85% | 3.32 | 1.4× |
| 70° | 1160 | 75% | 3.22 | 1.7× |
| 90° | 806 | 52% | 2.76 | 2.8× |
A fixed array in São Borja produces the most over a year at 25°. The design month for an off-grid system is June: at 54° it makes 3.34 kWh per kWp a day, 13% more than at 25°, and costs 11% of the yearly total. Why steep panels win winter.
Off-grid solar in São Borja at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 25° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 25° | Mean temp. |
|---|---|---|---|---|---|
| January | 6.76 | 3.08 | 2.48 | 4.96 | 26.7 °C |
| February | 6.24 | 3.71 | 3.02 | 4.94 | 26.2 °C |
| March | 5.38 | 4.34 | 3.56 | 4.72 | 24.3 °C |
| April | 4.19 | 4.58 | 3.82 | 4.16 | 20.8 °C |
| May | 3.10 | 4.14 | 3.52 | 3.39 | 16.5 °C |
| June | 2.60 | 3.76 | 3.22 | 2.96 | 14.5 °C |
| July | 2.93 | 4.18 | 3.60 | 3.34 | 13.5 °C |
| August | 3.65 | 4.36 | 3.72 | 3.83 | 15.4 °C |
| September | 4.38 | 3.96 | 3.34 | 4.09 | 17.6 °C |
| October | 5.32 | 3.57 | 2.96 | 4.45 | 20.7 °C |
| November | 6.57 | 3.17 | 2.60 | 4.99 | 22.8 °C |
| December | 6.94 | 2.87 | 2.31 | 5.00 | 25.4 °C |
| Year | 4.83 avg | 3.81 avg | 1160 kWh | 1545 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 510 Wp of panels at 70°, versus 400 Wp at 25°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in São Borja
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.
3.4 mrow pitch at 70°
3.0 mrow pitch at 25°
How São Borja compares in Brazil
Against the other 2,263 places in Brazil with climate data, for a fixed array at its best angle.
1758thof 2,264 places in Brazil for sunshine, shared: 4.83 peak sun hours a day on flat ground.
−2%solar energy a year compared with the average place in Brazil: 1,545 against 1,581 kWh per kWp.
+23 mindaylight on the longest day, compared with São Paulo: 13 h 58 min against 13 h 35 min.
25°best year-round tilt here; across Brazil it runs from 0° in Macapá to 28° in Santa Vitória do Palmar.
Of the 2,264 places in Brazil, Catolé do Rocha gets the most sun (6.16 peak sun hours a day) and Paranaguá the least (4.01); São Borja ranks joint 1758th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.32 kWh a day here, against 1.56 kWh on average in Brazil. The shortest day lasts 10 h 19 min, −22 min compared with São Paulo.
Solar forecast for São Borja, 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 São Borja
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A free, live card for São Borja: 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.