Reunion · Reunion · 21.17° S · 55.29° E
Solar position in Saint-Leu
Sun position, daylight and the best solar panel angle for Saint-Leu — computed for 21.17° S, 55.29° E, 10 m above sea level.
The sun right now
Sun in Saint-Leu today
Saturday, 24 October 2026 · local time UTC+4
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:24 | sun 18° below horizon |
| Nautical dawn | 04:51 | 12° below |
| Civil dawn | 05:18 | 6° below |
| Sunrise | 05:41 | 103° ESE |
| Golden hour ends | 06:10 | sun 6° up |
| Solar noon | 12:03 | 80.6° high |
| Golden hour starts | 17:55 | sun 6° up |
| Sunset | 18:25 | 257° WSW |
| Civil dusk | 18:48 | 6° below |
| Nautical dusk | 19:15 | 12° below |
| Astronomical dusk | 19:42 | 18° below |
| Day length | 12 h 44 min | |
Sun path diagram for Saint-Leu
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 45.4° at solar noon in Saint-Leu; on the December solstice only 87.7°. Sunrise swings from 65° ENE in June to 116° ESE in December — a 51° 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 | 05:53 | 12:30 | 19:06 | 13 h 12 min | 88.7° |
| February | 06:12 | 12:32 | 18:52 | 12 h 40 min | 79.3° |
| March | 06:22 | 12:25 | 18:28 | 12 h 06 min | 68.5° |
| April | 06:32 | 12:17 | 18:02 | 11 h 30 min | 56.9° |
| May | 06:44 | 12:15 | 17:46 | 11 h 02 min | 48.6° |
| June | 06:55 | 12:20 | 17:45 | 10 h 51 min | 45.4° |
| July | 06:54 | 12:25 | 17:56 | 11 h 01 min | 48.4° |
| August | 06:37 | 12:22 | 18:06 | 11 h 29 min | 56.8° |
| September | 06:09 | 12:12 | 18:14 | 12 h 05 min | 68.2° |
| October | 05:43 | 12:03 | 18:24 | 12 h 41 min | 79.6° |
| November | 05:28 | 12:04 | 18:40 | 13 h 12 min | 88.8° |
| December | 05:34 | 12:16 | 18:59 | 13 h 25 min | 87.7° |
A year of daylight in Saint-Leu
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 Saint-Leu
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
20°collects the most energy over a year: 1735 kWh per kWp.
33°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° | 1647 | 95% | 3.07 | 1.9× |
| 15° | 1730 | 100% | 3.77 | 1.4× |
| 20° year-round best | 1735 | 100% | 3.95 | 1.4× |
| 21° = latitude | 1735 | 100% | 3.98 | 1.3× |
| 30° | 1711 | 99% | 4.23 | 1.2× |
| 33° off-grid best | 1695 | 98% | 4.30 | 1.2× |
| 45° | 1593 | 92% | 4.44 | 1.3× |
| 60° | 1384 | 80% | 4.37 | 1.7× |
| 70° | 1203 | 69% | 4.17 | 2.2× |
| 90° | 813 | 47% | 3.44 | 3.5× |
A fixed array in Saint-Leu produces the most over a year at 20°. The design month for an off-grid system is June: at 33° it makes 4.30 kWh per kWp a day, 9% more than at 20°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in Saint-Leu 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 | 6.63 | 2.54 | 2.04 | 4.86 | 26.6 °C |
| February | 6.45 | 3.24 | 2.62 | 4.98 | 26.9 °C |
| March | 5.80 | 3.99 | 3.24 | 4.80 | 26.7 °C |
| April | 5.04 | 4.71 | 3.85 | 4.55 | 25.9 °C |
| May | 4.25 | 4.97 | 4.08 | 4.15 | 24.6 °C |
| June | 3.88 | 5.05 | 4.17 | 3.95 | 23.1 °C |
| July | 4.10 | 5.11 | 4.24 | 4.13 | 22.2 °C |
| August | 4.89 | 5.11 | 4.25 | 4.65 | 21.8 °C |
| September | 5.90 | 4.66 | 3.87 | 5.17 | 22.2 °C |
| October | 6.65 | 3.70 | 3.05 | 5.35 | 23.1 °C |
| November | 7.09 | 2.74 | 2.22 | 5.29 | 24.3 °C |
| December | 7.25 | 2.36 | 1.89 | 5.20 | 25.8 °C |
| Year | 5.66 avg | 4.02 avg | 1203 kWh | 1735 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 620 Wp of panels at 70°, versus 300 Wp at 20°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Saint-Leu
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.
2.8 mrow pitch at 70°
2.6 mrow pitch at 20°
How Saint-Leu compares in Reunion
Against the other 13 places in Reunion with climate data, for a fixed array at its best angle.
9thof 14 places in Reunion for sunshine: 5.66 peak sun hours a day on flat ground.
±0%solar energy a year compared with the average place in Reunion: 1,735 against 1,733 kWh per kWp.
+1 mindaylight on the longest day, compared with Saint-Denis: 13 h 25 min against 13 h 24 min.
20°best year-round tilt here; across Reunion it runs from 19° in Saint-Denis to 20° in Saint-Paul.
Of the 14 places in Reunion, Le Port and one other place get the most sun (5.71 peak sun hours a day) and Saint-Pierre the least (5.56); Saint-Leu ranks 9th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.89 kWh a day here, against 1.88 kWh on average in Reunion. The shortest day lasts 10 h 51 min, −1 min compared with Saint-Denis.
Solar forecast for Saint-Leu, 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 Saint-Leu
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A free, live card for Saint-Leu: 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.