Reunion · Reunion · 21.38° S · 55.62° E
Solar position in Saint-Joseph
Sun position, daylight and the best solar panel angle for Saint-Joseph — computed for 21.38° S, 55.62° E, 43 m above sea level.
The sun right now
Sun in Saint-Joseph today
Saturday, 24 October 2026 · local time UTC+4
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:22 | sun 18° below horizon |
| Nautical dawn | 04:49 | 12° below |
| Civil dawn | 05:16 | 6° below |
| Sunrise | 05:39 | 103° ESE |
| Golden hour ends | 06:09 | sun 6° up |
| Solar noon | 12:01 | 80.4° high |
| Golden hour starts | 17:54 | sun 6° up |
| Sunset | 18:24 | 257° WSW |
| Civil dusk | 18:47 | 6° below |
| Nautical dusk | 19:14 | 12° below |
| Astronomical dusk | 19:41 | 18° below |
| Day length | 12 h 45 min | |
Sun path diagram for Saint-Joseph
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 45.2° at solar noon in Saint-Joseph; on the December solstice only 87.9°. 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 | 05:52 | 12:28 | 19:05 | 13 h 13 min | 88.5° |
| February | 06:10 | 12:31 | 18:51 | 12 h 41 min | 79.1° |
| March | 06:21 | 12:24 | 18:27 | 12 h 06 min | 68.3° |
| April | 06:31 | 12:16 | 18:00 | 11 h 29 min | 56.7° |
| May | 06:43 | 12:14 | 17:44 | 11 h 01 min | 48.4° |
| June | 06:54 | 12:19 | 17:44 | 10 h 50 min | 45.2° |
| July | 06:53 | 12:24 | 17:54 | 11 h 01 min | 48.2° |
| August | 06:36 | 12:20 | 18:05 | 11 h 29 min | 56.6° |
| September | 06:08 | 12:10 | 18:13 | 12 h 05 min | 68.0° |
| October | 05:41 | 12:02 | 18:22 | 12 h 41 min | 79.4° |
| November | 05:26 | 12:03 | 18:40 | 13 h 13 min | 88.6° |
| December | 05:32 | 12:15 | 18:58 | 13 h 26 min | 87.9° |
A year of daylight in Saint-Joseph
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-Joseph
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: 1713 kWh per kWp.
34°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° | 1626 | 95% | 3.01 | 1.9× |
| 15° | 1708 | 100% | 3.69 | 1.5× |
| 20° year-round best | 1713 | 100% | 3.87 | 1.4× |
| 21° = latitude | 1712 | 100% | 3.90 | 1.4× |
| 30° | 1689 | 99% | 4.15 | 1.2× |
| 34° off-grid best | 1668 | 97% | 4.22 | 1.2× |
| 45° | 1573 | 92% | 4.34 | 1.3× |
| 60° | 1367 | 80% | 4.27 | 1.7× |
| 70° | 1190 | 69% | 4.08 | 2.2× |
| 90° | 804 | 47% | 3.37 | 3.4× |
A fixed array in Saint-Joseph produces the most over a year at 20°. The design month for an off-grid system is June: at 34° it makes 4.22 kWh per kWp a day, 9% more than at 20°, and costs 3% of the yearly total. Why steep panels win winter.
Off-grid solar in Saint-Joseph 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 | 6.58 | 2.55 | 2.05 | 4.83 | 26.3 °C |
| February | 6.37 | 3.23 | 2.61 | 4.93 | 26.6 °C |
| March | 5.72 | 3.95 | 3.22 | 4.74 | 26.3 °C |
| April | 4.96 | 4.64 | 3.80 | 4.49 | 25.4 °C |
| May | 4.18 | 4.87 | 4.02 | 4.08 | 24.1 °C |
| June | 3.80 | 4.93 | 4.08 | 3.87 | 22.6 °C |
| July | 4.01 | 4.99 | 4.15 | 4.04 | 21.6 °C |
| August | 4.79 | 4.99 | 4.16 | 4.56 | 21.3 °C |
| September | 5.80 | 4.60 | 3.82 | 5.09 | 21.7 °C |
| October | 6.56 | 3.69 | 3.04 | 5.30 | 22.6 °C |
| November | 7.00 | 2.75 | 2.23 | 5.24 | 23.9 °C |
| December | 7.18 | 2.37 | 1.90 | 5.16 | 25.4 °C |
| Year | 5.57 avg | 3.97 avg | 1190 kWh | 1713 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-Joseph
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-Joseph compares in Reunion
Against the other 13 places in Reunion with climate data, for a fixed array at its best angle.
12thof 14 places in Reunion for sunshine, shared: 5.58 peak sun hours a day on flat ground.
−1%solar energy a year compared with the average place in Reunion: 1,713 against 1,733 kWh per kWp.
+2 mindaylight on the longest day, compared with Saint-Denis: 13 h 26 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-Joseph ranks joint 12th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.90 kWh a day here, against 1.88 kWh on average in Reunion. The shortest day lasts 10 h 50 min, −2 min compared with Saint-Denis.
Solar forecast for Saint-Joseph, 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-Joseph
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A free, live card for Saint-Joseph: 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.