Solarposition.org

Cantabria · Spain · 43.38° N · 3.22° W

Solar position in Castro-Urdiales

Sun position, daylight and the best solar panel angle for Castro-Urdiales — computed for 43.38° N, 3.22° W, 18 m above sea level.

Sunrise today08:37105° ESE
Sunset today19:15254° WSW
Best panel angle34°year-round, facing south
Off-grid angle63°best for the darkest month

The sun right now

Azimuth180.0°
Elevation34.8°
At solar noon, 13:56Open on the sun map

Sun in Castro-Urdiales today

Saturday, 24 October 2026 · local time UTC+2

EventTimeDirection / height
Astronomical dawn07:02sun 18° below horizon
Nautical dawn07:3512° below
Civil dawn08:086° below
Sunrise08:37105° ESE
Golden hour ends09:17sun 6° up
Solar noon13:5634.8° high
Golden hour starts18:35sun 6° up
Sunset19:15254° WSW
Civil dusk19:446° below
Nautical dusk20:1812° below
Astronomical dusk20:5118° below
Day length10 h 38 min

Sun path diagram for Castro-Urdiales

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice789101112131415161718192021EquinoxDecember solstice91011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 70.1° at solar noon in Castro-Urdiales; on the December solstice only 23.2°. Sunrise swings from 56° NE in June to 122° ESE in December — a 66° 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January08:3813:2418:099 h 31 min26.8°
February08:0213:2618:5110 h 49 min36.2°
March07:1413:2019:2612 h 12 min47.0°
April07:2114:1121:0213 h 42 min58.6°
May06:4214:0921:3614 h 54 min66.9°
June06:3214:1421:5715 h 25 min70.1°
July06:5114:1921:4614 h 55 min67.0°
August07:2414:1521:0613 h 42 min58.6°
September07:5814:0520:1212 h 13 min47.2°
October08:3413:5719:2010 h 46 min35.8°
November08:1312:5817:439 h 30 min26.7°
December08:4213:1017:398 h 58 min23.2°

A year of daylight in Castro-Urdiales

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Castro-Urdiales

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

34°collects the most energy over a year: 1282 kWh per kWp.

63°gives the most in the darkest month — the one an off-grid system is sized for.

40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 34°Best worst-month 63°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°109585%1.014.8×
15°122195%1.453.4×
30°1279100%1.812.6×
34° year-round best1282100%1.892.5×
43° = latitude127099%2.042.2×
45°126399%2.062.1×
60°117792%2.181.8×
63° off-grid best115290%2.191.8×
70°108485%2.181.7×
90°82664%2.011.5×

A fixed array in Castro-Urdiales produces the most over a year at 34°. The design month for an off-grid system is December: at 63° it makes 2.19 kWh per kWp a day, 16% more than at 34°, and costs 10% of the yearly total. Why steep panels win winter.

Off-grid solar in Castro-Urdiales at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 34° (year-round best).

012345January: 2.14 (70°)2.1JanFebruary: 2.76 (70°)2.8FebMarch: 3.33 (70°)3.3MarApril: 3.36 (70°)3.4AprMay: 3.21 (70°)3.2MayJune: 3.03 (70°)3.0JunJuly: 3.14 (70°)3.1JulAugust: 3.39 (70°)3.4AugSeptember: 3.63 (70°)3.6SepOctober: 3.09 (70°)3.1OctNovember: 2.35 (70°)2.4NovDecember: 2.18 (70°)2.2Dec34°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 34°Mean temp.
January1.412.472.141.929.1 °C
February2.243.172.762.708.9 °C
March3.473.853.333.6510.6 °C
April4.593.913.364.2112.2 °C
May5.483.793.214.5414.6 °C
June5.863.633.034.5817.9 °C
July5.913.793.144.6620.0 °C
August5.254.083.394.4920.8 °C
September4.244.333.634.1719.1 °C
October2.763.643.093.1316.4 °C
November1.652.742.352.1512.2 °C
December1.302.522.181.899.8 °C
Year3.69 avg3.49 avg1084 kWh1282 kWh

Sizing example. To run a 1 kWh-per-day load through January on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 550 Wp of panels at 70°, versus 620 Wp at 34°. The steep array is 12% smaller for the same winter. Size your own system.

Row spacing in Castro-Urdiales

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.

5.8 mrow pitch at 70°

4.7 mrow pitch at 34°

Row spacing calculator

How Castro-Urdiales compares in Spain

Against the other 543 places in Spain with climate data, for a fixed array at its best angle.

536thof 544 places in Spain for sunshine: 3.69 peak sun hours a day on flat ground.

−20%solar energy a year compared with the average place in Spain: 1,282 against 1,601 kWh per kWp.

+21 mindaylight on the longest day, compared with Madrid: 15 h 25 min against 15 h 04 min.

34°best year-round tilt here; across Spain it runs from 24° in Arona to 36° in Girona.

Of the 544 places in Spain, Playa del Ingles and one other place get the most sun (5.53 peak sun hours a day) and Santander the least (3.65); Castro-Urdiales ranks 536th. In its darkest month, January, 1 kWp of off-grid panels at 70° makes 2.14 kWh a day here, against 3.03 kWh on average in Spain. The shortest day lasts 8 h 58 min, −20 min compared with Madrid.

The sunniest places in Spain

Solar forecast for Castro-Urdiales, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Castro-Urdiales

What is the best solar panel angle in Castro-Urdiales?
For a fixed array facing south, the best year-round tilt in Castro-Urdiales is 34°, worth about 1282 kWh per kWp a year. An off-grid system that has to get through December does better at about 63°.
What time is sunrise and sunset in Castro-Urdiales today?
On 24 October 2026 the sun rises at 08:37 and sets at 19:15 local time (UTC+2), giving 10 h 38 min of daylight. Solar noon is at 13:56.
How many peak sun hours does Castro-Urdiales get?
On a flat surface 3.7 hours a day averaged over the year, from 1.3 in December to 5.9 in July. Panels tilted at 70° receive 2.5 sun hours a day in January.
How high does the sun get in Castro-Urdiales?
At solar noon the sun stands 70.1° above the horizon on the June solstice and 23.2° on the December solstice.
Is Castro-Urdiales a good place for solar panels?
With 3.7 peak sun hours a day on flat ground, Castro-Urdiales ranks 536th of 544 places in Spain for sunshine. A 1 kWp array at the best angle (34°) makes about 1,282 kWh a year here, 20% less than the average place in Spain.

Places near Castro-Urdiales

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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.