Solarposition.org

Cambodia · 13.36° N · 103.86° E

Solar position in Siem Reap

Sun position, daylight and the best solar panel angle for Siem Reap — computed for 13.36° N, 103.86° E, 18 m above sea level.

Sunrise today05:56102° ESE
Sunset today17:40258° WSW
Best panel angle14°year-round, facing south
Off-grid angle9°best for the darkest month

The sun right now

Azimuth180.0°
Elevation64.5°
At solar noon, 11:48Open on the sun map

Sun in Siem Reap today

Sunday, 25 October 2026 · local time UTC+7

EventTimeDirection / height
Astronomical dawn04:45sun 18° below horizon
Nautical dawn05:1012° below
Civil dawn05:356° below
Sunrise05:56102° ESE
Golden hour ends06:25sun 6° up
Solar noon11:4864.5° high
Golden hour starts17:11sun 6° up
Sunset17:40258° WSW
Civil dusk18:026° below
Nautical dusk18:2712° below
Astronomical dusk18:5218° below
Day length11 h 44 min

Sun path diagram for Siem Reap

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 solstice6789101112131415161718EquinoxDecember solstice7891011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 79.9° at solar noon in Siem Reap; on the December solstice only 53.2°. Sunrise swings from 66° ENE in June to 114° ESE in December — a 48° 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
January06:3112:1517:5911 h 28 min56.7°
February06:2412:1818:1111 h 47 min66.1°
March06:0812:1118:1512 h 07 min76.9°
April05:4812:0318:1812 h 30 min88.5°
May05:3712:0118:2412 h 47 min83.2°
June05:3812:0618:3312 h 55 min79.9°
July05:4612:1118:3412 h 48 min82.9°
August05:5212:0718:2212 h 30 min88.7°
September05:5311:5718:0112 h 08 min77.3°
October05:5511:4917:4211 h 46 min65.9°
November06:0611:5017:3411 h 28 min56.7°
December06:2212:0217:4211 h 20 min53.2°

A year of daylight in Siem Reap

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 Siem Reap

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

14°collects the most energy over a year: 1522 kWh per kWp.

9°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 14°Best worst-month 9°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearSeptember kWh/kWp/dayBest ÷ worst month
0°148397%3.731.2×
9° off-grid best1516100%3.761.2×
13° = latitude1521100%3.751.2×
14° year-round best1522100%3.751.2×
15°1521100%3.741.2×
30°147797%3.571.4×
45°135289%3.211.8×
60°115876%2.702.4×
70°99966%2.292.9×
90°69446%1.363.1×

A fixed array in Siem Reap produces the most over a year at 14°. The design month for an off-grid system is September: at 9° it makes 3.76 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.

Off-grid solar in Siem Reap at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 14° (year-round best).

012345January: 4.29 (70°)4.3JanFebruary: 3.65 (70°)3.6FebMarch: 2.86 (70°)2.9MarApril: 2.17 (70°)2.2AprMay: 1.65 (70°)1.6MayJune: 1.47 (70°)1.5JunJuly: 1.55 (70°)1.6JulAugust: 1.87 (70°)1.9AugSeptember: 2.29 (70°)2.3SepOctober: 2.98 (70°)3.0OctNovember: 3.81 (70°)3.8NovDecember: 4.31 (70°)4.3Dec14°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 14°Mean temp.
January5.065.264.294.5326.6 °C
February5.364.523.654.5428.8 °C
March5.423.582.864.3530.3 °C
April5.712.742.174.3830.4 °C
May5.632.091.654.1929.2 °C
June5.361.861.473.9527.8 °C
July5.181.961.553.8627.0 °C
August4.972.341.873.8226.8 °C
September4.712.842.293.7526.7 °C
October4.833.672.984.0326.6 °C
November4.854.663.814.2726.1 °C
December4.835.274.314.3925.7 °C
Year5.16 avg3.39 avg999 kWh1522 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 810 Wp of panels at 70°, versus 310 Wp at 14°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.

Row spacing in Siem Reap

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.

2.3 mrow pitch at 70°

2.3 mrow pitch at 14°

Row spacing calculator

How Siem Reap compares in Cambodia

Against the other 45 places in Cambodia with climate data, for a fixed array at its best angle.

32ndof 46 places in Cambodia for sunshine: 5.16 peak sun hours a day on flat ground.

±0%solar energy a year compared with the average place in Cambodia: 1,522 against 1,520 kWh per kWp.

+7 mindaylight on the longest day, compared with Phnom Penh: 12 h 55 min against 12 h 48 min.

14°best year-round tilt here; across Cambodia it runs from 12° in Phnom Penh to 16° in Anlong Veaeng.

Of the 46 places in Cambodia, Snuol gets the most sun (5.29 peak sun hours a day) and Smach Mean Chey the least (4.78); Siem Reap ranks 32nd. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.47 kWh a day here, against 1.39 kWh on average in Cambodia. The shortest day lasts 11 h 20 min, −7 min compared with Phnom Penh.

The sunniest places in Cambodia

Solar forecast for Siem Reap, 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 Siem Reap

What is the best solar panel angle in Siem Reap?
For a fixed array facing south, the best year-round tilt in Siem Reap is 14°, worth about 1522 kWh per kWp a year. An off-grid system that has to get through September does better at about 9°.
What time is sunrise and sunset in Siem Reap today?
On 25 October 2026 the sun rises at 05:56 and sets at 17:40 local time (UTC+7), giving 11 h 44 min of daylight. Solar noon is at 11:48.
How many peak sun hours does Siem Reap get?
On a flat surface 5.2 hours a day averaged over the year, from 4.7 in September to 5.7 in April. Panels tilted at 70° receive 1.9 sun hours a day in June.
How high does the sun get in Siem Reap?
At solar noon the sun stands 79.9° above the horizon on the June solstice and 53.2° on the December solstice.
Is Siem Reap a good place for solar panels?
With 5.2 peak sun hours a day on flat ground, Siem Reap ranks 32nd of 46 places in Cambodia for sunshine. A 1 kWp array at the best angle (14°) makes about 1,522 kWh a year here, as much as the average place in Cambodia.

Places near Siem Reap

All places in Cambodia

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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.