Prachuap Khiri Khan · Thailand · 12.08° N · 99.85° E
Solar position in Kui Buri
Sun position, daylight and the best solar panel angle for Kui Buri — computed for 12.08° N, 99.85° E, 15 m above sea level.
The sun right now
Sun in Kui Buri today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:00 | sun 18° below horizon |
| Nautical dawn | 05:25 | 12° below |
| Civil dawn | 05:50 | 6° below |
| Sunrise | 06:11 | 102° ESE |
| Golden hour ends | 06:40 | sun 6° up |
| Solar noon | 12:04 | 65.8° high |
| Golden hour starts | 17:28 | sun 6° up |
| Sunset | 17:57 | 258° WSW |
| Civil dusk | 18:19 | 6° below |
| Nautical dusk | 18:44 | 12° below |
| Astronomical dusk | 19:08 | 18° below |
| Day length | 11 h 46 min | |
Sun path diagram for Kui Buri
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 78.6° at solar noon in Kui Buri; on the December solstice only 54.5°. 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.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 06:45 | 12:31 | 18:17 | 11 h 32 min | 58.0° |
| February | 06:39 | 12:34 | 18:28 | 11 h 49 min | 67.4° |
| March | 06:24 | 12:27 | 18:31 | 12 h 07 min | 78.2° |
| April | 06:05 | 12:19 | 18:33 | 12 h 27 min | 89.8° |
| May | 05:55 | 12:17 | 18:38 | 12 h 43 min | 81.9° |
| June | 05:57 | 12:22 | 18:47 | 12 h 50 min | 78.6° |
| July | 06:04 | 12:27 | 18:48 | 12 h 44 min | 81.6° |
| August | 06:09 | 12:23 | 18:37 | 12 h 28 min | 90.0° |
| September | 06:09 | 12:13 | 18:17 | 12 h 08 min | 78.6° |
| October | 06:11 | 12:05 | 17:59 | 11 h 48 min | 67.2° |
| November | 06:20 | 12:06 | 17:52 | 11 h 32 min | 58.0° |
| December | 06:35 | 12:18 | 18:01 | 11 h 25 min | 54.5° |
A year of daylight in Kui Buri
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 Kui Buri
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
13°collects the most energy over a year: 1454 kWh per kWp.
4°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 | July kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1423 | 98% | 3.60 | 1.3× |
| 4° off-grid best | 1439 | 99% | 3.56 | 1.3× |
| 12° = latitude | 1454 | 100% | 3.44 | 1.3× |
| 13° year-round best | 1454 | 100% | 3.42 | 1.3× |
| 15° | 1454 | 100% | 3.38 | 1.4× |
| 30° | 1407 | 97% | 3.00 | 1.6× |
| 45° | 1286 | 88% | 2.47 | 1.9× |
| 60° | 1099 | 76% | 1.85 | 2.4× |
| 70° | 947 | 65% | 1.44 | 2.8× |
| 90° | 656 | 45% | 1.11 | 2.9× |
A fixed array in Kui Buri produces the most over a year at 13°. The design month for an off-grid system is July: at 4° it makes 3.56 kWh per kWp a day, 4% more than at 13°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Kui Buri at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 13° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 13° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.86 | 4.83 | 3.97 | 4.31 | 24.5 °C |
| February | 5.41 | 4.46 | 3.64 | 4.61 | 25.8 °C |
| March | 5.67 | 3.63 | 2.94 | 4.61 | 27.1 °C |
| April | 5.84 | 2.69 | 2.15 | 4.52 | 28.3 °C |
| May | 5.15 | 2.03 | 1.60 | 3.88 | 27.6 °C |
| June | 4.74 | 1.80 | 1.42 | 3.54 | 26.7 °C |
| July | 4.55 | 1.82 | 1.44 | 3.42 | 26.3 °C |
| August | 4.53 | 2.16 | 1.73 | 3.49 | 26.1 °C |
| September | 4.61 | 2.74 | 2.22 | 3.67 | 25.9 °C |
| October | 4.42 | 3.26 | 2.65 | 3.65 | 25.8 °C |
| November | 4.59 | 4.21 | 3.44 | 3.98 | 25.3 °C |
| December | 4.69 | 4.87 | 4.01 | 4.20 | 24.3 °C |
| Year | 4.92 avg | 3.20 avg | 947 kWh | 1454 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 830 Wp of panels at 70°, versus 340 Wp at 13°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Kui Buri
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.
2.2 mrow pitch at 70°
2.3 mrow pitch at 13°
How Kui Buri compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
254thof 295 places in Thailand for sunshine, shared: 4.92 peak sun hours a day on flat ground.
−4%solar energy a year compared with the average place in Thailand: 1,454 against 1,509 kWh per kWp.
−6 mindaylight on the longest day, compared with Bangkok: 12 h 50 min against 12 h 56 min.
13°best year-round tilt here; across Thailand it runs from 4° in Narathiwat to 23° in Mae Chan.
Of the 295 places in Thailand, Bangkok and 7 other places get the most sun (5.23 peak sun hours a day) and Mae Ramat the least (4.74); Kui Buri ranks joint 254th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.42 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 25 min, +6 min compared with Bangkok.
Solar forecast for Kui Buri, 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 Kui Buri
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Places near Kui Buri
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A free, live card for Kui Buri: 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.