Solarposition.org

Hawaii · United States · 21.28° N · 157.81° W

Solar position in Diamond Head / Kapahulu / Saint Louis Heights

Sun position, daylight and the best solar panel angle for Diamond Head / Kapahulu / Saint Louis Heights — computed for 21.28° N, 157.81° W, 14 m above sea level.

Sunrise today06:30102° ESE
Sunset today17:59257° WSW
Best panel angle18°year-round, facing south
Off-grid angle32°best for the darkest month

The sun right now

Azimuth180.0°
Elevation56.7°
At solar noon, 12:15Open on the sun map

Sun in Diamond Head / Kapahulu / Saint Louis Heights today

Saturday, 24 October 2026 · local time UTC−10

EventTimeDirection / height
Astronomical dawn05:15sun 18° below horizon
Nautical dawn05:4112° below
Civil dawn06:076° below
Sunrise06:30102° ESE
Golden hour ends07:00sun 6° up
Solar noon12:1556.7° high
Golden hour starts17:29sun 6° up
Sunset17:59257° WSW
Civil dusk18:226° below
Nautical dusk18:4812° below
Astronomical dusk19:1418° below
Day length11 h 29 min

Sun path diagram for Diamond Head / Kapahulu / Saint Louis Heights

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 solstice678910111213141516171819EquinoxDecember solstice891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 87.8° at solar noon in Diamond Head / Kapahulu / Saint Louis Heights; on the December solstice only 45.3°. Sunrise swings from 64° ENE in June to 115° 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January07:1012:4218:1411 h 04 min49.0°
February06:5712:4418:3211 h 35 min58.4°
March06:3412:3818:4212 h 09 min69.3°
April06:0712:2918:5212 h 46 min80.8°
May05:5012:2719:0513 h 14 min89.1°
June05:5012:3319:1613 h 26 min87.8°
July06:0012:3719:1413 h 14 min89.0°
August06:1112:3418:5612 h 45 min80.6°
September06:1912:2418:2812 h 08 min69.1°
October06:2912:1518:0111 h 33 min57.8°
November06:4512:1717:4811 h 02 min48.7°
December07:0412:2917:5410 h 50 min45.3°

A year of daylight in Diamond Head / Kapahulu / Saint Louis Heights

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 Diamond Head / Kapahulu / Saint Louis Heights

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

18°collects the most energy over a year: 1763 kWh per kWp.

32°gives the most in the darkest month — the one an off-grid system is sized for.

20%30%40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 18°Best worst-month 32°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°168496%3.191.8×
15°1760100%3.921.4×
18° year-round best1763100%4.041.3×
21° = latitude1762100%4.151.3×
30°173398%4.411.2×
32° off-grid best172198%4.461.1×
45°160491%4.631.3×
60°138478%4.561.9×
70°119768%4.362.5×
90°79945%3.614.0×

A fixed array in Diamond Head / Kapahulu / Saint Louis Heights produces the most over a year at 18°. The design month for an off-grid system is December: at 32° it makes 4.46 kWh per kWp a day, 10% more than at 18°, and costs 2% of the yearly total. Why steep panels win winter.

Off-grid solar in Diamond Head / Kapahulu / Saint Louis Heights at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 18° (year-round best).

0123456January: 4.53 (70°)4.5JanFebruary: 4.12 (70°)4.1FebMarch: 3.55 (70°)3.5MarApril: 2.87 (70°)2.9AprMay: 2.14 (70°)2.1MayJune: 1.78 (70°)1.8JunJuly: 1.90 (70°)1.9JulAugust: 2.51 (70°)2.5AugSeptember: 3.44 (70°)3.4SepOctober: 3.96 (70°)4.0OctNovember: 4.25 (70°)4.2NovDecember: 4.36 (70°)4.4Dec18°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 18°Mean temp.
January4.395.504.534.3323.6 °C
February4.984.984.124.5923.1 °C
March5.614.303.554.8223.3 °C
April6.423.502.875.1423.9 °C
May6.902.642.145.1924.7 °C
June7.142.231.785.1925.4 °C
July7.072.371.905.1825.9 °C
August6.813.102.515.2526.3 °C
September6.324.233.445.2426.5 °C
October5.304.853.964.7226.1 °C
November4.475.184.254.2725.3 °C
December4.055.304.364.0424.3 °C
Year5.79 avg4.01 avg1197 kWh1763 kWh

Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 660 Wp of panels at 70°, versus 290 Wp at 18°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Diamond Head / Kapahulu / Saint Louis Heights

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 18°

Row spacing calculator

How Diamond Head / Kapahulu / Saint Louis Heights compares in the United States

Against the other 3,120 places in the United States with climate data, for a fixed array at its best angle.

78thof 3,121 places in the United States for sunshine, shared: 5.79 peak sun hours a day on flat ground.

+16%solar energy a year compared with the average place in the United States: 1,763 against 1,515 kWh per kWp.

−1 h 40 mindaylight on the longest day, compared with New York City: 13 h 26 min against 15 h 06 min.

18°best year-round tilt here; across the United States it runs from 18° in Honolulu to 53° in Fairbanks.

Of the 3,121 places in the United States, Fortuna Foothills and 2 other places get the most sun (5.96 peak sun hours a day) and Juneau the least (2.38); Diamond Head / Kapahulu / Saint Louis Heights ranks joint 78th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.78 kWh a day here, against 2.55 kWh on average in the United States. The shortest day lasts 10 h 50 min, +1 h 35 min compared with New York City.

The sunniest places in the United States

Solar forecast for Diamond Head / Kapahulu / Saint Louis Heights, 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 Diamond Head / Kapahulu / Saint Louis Heights

What is the best solar panel angle in Diamond Head / Kapahulu / Saint Louis Heights?
For a fixed array facing south, the best year-round tilt in Diamond Head / Kapahulu / Saint Louis Heights is 18°, worth about 1763 kWh per kWp a year. An off-grid system that has to get through December does better at about 32°.
What time is sunrise and sunset in Diamond Head / Kapahulu / Saint Louis Heights today?
On 24 October 2026 the sun rises at 06:30 and sets at 17:59 local time (UTC−10), giving 11 h 29 min of daylight. Solar noon is at 12:15.
How many peak sun hours does Diamond Head / Kapahulu / Saint Louis Heights get?
On a flat surface 5.8 hours a day averaged over the year, from 4.0 in December to 7.1 in June. Panels tilted at 70° receive 2.2 sun hours a day in June.
How high does the sun get in Diamond Head / Kapahulu / Saint Louis Heights?
At solar noon the sun stands 87.8° above the horizon on the June solstice and 45.3° on the December solstice.
Is Diamond Head / Kapahulu / Saint Louis Heights a good place for solar panels?
With 5.8 peak sun hours a day on flat ground, Diamond Head / Kapahulu / Saint Louis Heights ranks joint 78th of 3,121 places in the United States for sunshine. A 1 kWp array at the best angle (18°) makes about 1,763 kWh a year here, 16% more than the average place in the United States.

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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.