Île-de-France · France · 48.99° N · 1.72° E
Solar position in Mantes-la-Jolie
Sun position, daylight and the best solar panel angle for Mantes-la-Jolie — computed for 48.99° N, 1.72° E, 41 m above sea level.
The sun right now
Sun in Mantes-la-Jolie today
Sunday, 25 October 2026 · local time UTC+2
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:42 | sun 18° below horizon |
| Nautical dawn | 06:19 | 12° below |
| Civil dawn | 06:56 | 6° below |
| Sunrise | 07:29 | 108° ESE |
| Golden hour ends | 08:14 | sun 6° up |
| Solar noon | 12:36 | 28.8° high |
| Golden hour starts | 16:59 | sun 6° up |
| Sunset | 17:44 | 252° WSW |
| Civil dusk | 18:17 | 6° below |
| Nautical dusk | 18:54 | 12° below |
| Astronomical dusk | 19:30 | 18° below |
| Day length | 10 h 16 min | |
Sun path diagram for Mantes-la-Jolie
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 64.5° at solar noon in Mantes-la-Jolie; on the December solstice only 17.6°. Sunrise swings from 51° NE in June to 126° SE in December — a 75° 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 | 08:36 | 13:04 | 17:32 | 8 h 56 min | 21.2° |
| February | 07:50 | 13:07 | 18:23 | 10 h 32 min | 30.6° |
| March | 06:54 | 13:00 | 19:07 | 12 h 13 min | 41.4° |
| April | 06:50 | 13:52 | 20:54 | 14 h 03 min | 53.0° |
| May | 06:03 | 13:49 | 21:36 | 15 h 33 min | 61.3° |
| June | 05:48 | 13:54 | 22:01 | 16 h 12 min | 64.5° |
| July | 06:11 | 13:59 | 21:46 | 15 h 35 min | 61.4° |
| August | 06:53 | 13:56 | 20:57 | 14 h 04 min | 53.0° |
| September | 07:38 | 13:45 | 19:53 | 12 h 15 min | 41.6° |
| October | 08:22 | 13:37 | 18:51 | 10 h 29 min | 30.2° |
| November | 08:11 | 12:38 | 17:05 | 8 h 54 min | 21.1° |
| December | 08:44 | 12:51 | 16:57 | 8 h 14 min | 17.6° |
A year of daylight in Mantes-la-Jolie
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 Mantes-la-Jolie
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
38°collects the most energy over a year: 1177 kWh per kWp.
71°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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 970 | 82% | 0.60 | 7.8× |
| 15° | 1099 | 93% | 0.95 | 5.1× |
| 30° | 1167 | 99% | 1.25 | 3.8× |
| 38° year-round best | 1177 | 100% | 1.37 | 3.3× |
| 45° | 1170 | 99% | 1.47 | 3.0× |
| 49° = latitude | 1159 | 99% | 1.51 | 2.8× |
| 60° | 1107 | 94% | 1.59 | 2.5× |
| 70° | 1031 | 88% | 1.62 | 2.2× |
| 71° off-grid best | 1022 | 87% | 1.62 | 2.2× |
| 90° | 811 | 69% | 1.53 | 1.8× |
A fixed array in Mantes-la-Jolie produces the most over a year at 38°. The design month for an off-grid system is December: at 71° it makes 1.62 kWh per kWp a day, 18% more than at 38°, and costs 13% of the yearly total. Why steep panels win winter.
Off-grid solar in Mantes-la-Jolie at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 38° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 38° | Mean temp. |
|---|---|---|---|---|---|
| January | 0.95 | 1.91 | 1.69 | 1.49 | 3.2 °C |
| February | 1.72 | 2.75 | 2.44 | 2.33 | 3.7 °C |
| March | 2.93 | 3.58 | 3.15 | 3.32 | 6.5 °C |
| April | 4.47 | 4.19 | 3.63 | 4.32 | 9.9 °C |
| May | 5.19 | 3.94 | 3.36 | 4.42 | 13.2 °C |
| June | 5.71 | 3.93 | 3.30 | 4.56 | 16.7 °C |
| July | 5.54 | 3.97 | 3.31 | 4.49 | 18.6 °C |
| August | 4.71 | 4.00 | 3.35 | 4.16 | 18.4 °C |
| September | 3.68 | 4.11 | 3.50 | 3.85 | 15.3 °C |
| October | 2.15 | 3.10 | 2.67 | 2.65 | 11.5 °C |
| November | 1.15 | 2.17 | 1.89 | 1.71 | 7.0 °C |
| December | 0.79 | 1.83 | 1.62 | 1.37 | 3.7 °C |
| Year | 3.26 avg | 3.29 avg | 1031 kWh | 1177 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 730 Wp of panels at 70°, versus 860 Wp at 38°. The steep array is 15% smaller for the same winter. Size your own system.
Row spacing in Mantes-la-Jolie
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.
8.0 mrow pitch at 70°
6.4 mrow pitch at 38°
How Mantes-la-Jolie compares in France
Against the other 656 places in France with climate data, for a fixed array at its best angle.
485thof 657 places in France for sunshine, shared: 3.26 peak sun hours a day on flat ground.
−7%solar energy a year compared with the average place in France: 1,177 against 1,261 kWh per kWp.
+1 mindaylight on the longest day, compared with Paris: 16 h 12 min against 16 h 11 min.
38°best year-round tilt here; across France it runs from 33° in Ajaccio to 39° in Lille.
Of the 657 places in France, Marseille 12 and 5 other places get the most sun (4.46 peak sun hours a day) and Maubeuge and one other place the least (3.10); Mantes-la-Jolie ranks joint 485th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.62 kWh a day here, against 1.86 kWh on average in France. The shortest day lasts 8 h 14 min, −1 min compared with Paris.
Solar forecast for Mantes-la-Jolie, 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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A free, live card for Mantes-la-Jolie: 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.