Thailand · 17.88° N · 102.74° E
Solar position in Nong Khai
Sun position, daylight and the best solar panel angle for Nong Khai — computed for 17.88° N, 102.74° E, 168 m above sea level.
The sun right now
Sun in Nong Khai today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:52 | sun 18° below horizon |
| Nautical dawn | 05:17 | 12° below |
| Civil dawn | 05:43 | 6° below |
| Sunrise | 06:05 | 102° ESE |
| Golden hour ends | 06:34 | sun 6° up |
| Solar noon | 11:53 | 60.0° high |
| Golden hour starts | 17:11 | sun 6° up |
| Sunset | 17:40 | 257° WSW |
| Civil dusk | 18:02 | 6° below |
| Nautical dusk | 18:28 | 12° below |
| Astronomical dusk | 18:53 | 18° below |
| Day length | 11 h 35 min | |
Sun path diagram for Nong Khai
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 84.4° at solar noon in Nong Khai; on the December solstice only 48.7°. Sunrise swings from 65° ENE in June to 114° ESE in December — a 49° 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 | 06:43 | 12:20 | 17:57 | 11 h 14 min | 52.2° |
| February | 06:32 | 12:22 | 18:12 | 11 h 39 min | 61.6° |
| March | 06:12 | 12:16 | 18:20 | 12 h 07 min | 72.4° |
| April | 05:48 | 12:07 | 18:26 | 12 h 38 min | 84.0° |
| May | 05:34 | 12:05 | 18:36 | 13 h 02 min | 87.7° |
| June | 05:34 | 12:10 | 18:46 | 13 h 12 min | 84.4° |
| July | 05:43 | 12:15 | 18:46 | 13 h 03 min | 87.4° |
| August | 05:52 | 12:12 | 18:31 | 12 h 39 min | 84.2° |
| September | 05:57 | 12:02 | 18:06 | 12 h 09 min | 72.8° |
| October | 06:04 | 11:53 | 17:43 | 11 h 39 min | 61.4° |
| November | 06:17 | 11:54 | 17:31 | 11 h 14 min | 52.2° |
| December | 06:35 | 12:06 | 17:38 | 11 h 04 min | 48.7° |
A year of daylight in Nong Khai
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 Nong Khai
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
20°collects the most energy over a year: 1495 kWh per kWp.
1°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° | 1421 | 95% | 3.67 | 1.2× |
| 1° off-grid best | 1428 | 96% | 3.67 | 1.2× |
| 15° | 1490 | 100% | 3.51 | 1.3× |
| 18° = latitude | 1494 | 100% | 3.46 | 1.3× |
| 20° year-round best | 1495 | 100% | 3.42 | 1.3× |
| 30° | 1478 | 99% | 3.18 | 1.5× |
| 45° | 1386 | 93% | 2.69 | 1.8× |
| 60° | 1220 | 82% | 2.09 | 2.3× |
| 70° | 1076 | 72% | 1.67 | 2.7× |
| 90° | 762 | 51% | 1.15 | 3.3× |
A fixed array in Nong Khai produces the most over a year at 20°. The design month for an off-grid system is July: at 1° it makes 3.67 kWh per kWp a day, 7% more than at 20°, and costs 4% of the yearly total. Why steep panels win winter.
Off-grid solar in Nong Khai at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 20° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 20° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.66 | 5.31 | 4.43 | 4.56 | 21.2 °C |
| February | 5.10 | 4.68 | 3.85 | 4.58 | 24.5 °C |
| March | 5.14 | 3.69 | 2.98 | 4.23 | 27.7 °C |
| April | 5.66 | 3.06 | 2.44 | 4.33 | 29.9 °C |
| May | 5.38 | 2.37 | 1.88 | 3.95 | 28.8 °C |
| June | 4.96 | 2.12 | 1.68 | 3.60 | 27.3 °C |
| July | 4.65 | 2.10 | 1.67 | 3.42 | 26.6 °C |
| August | 4.49 | 2.39 | 1.91 | 3.42 | 26.2 °C |
| September | 4.68 | 3.03 | 2.46 | 3.75 | 26.1 °C |
| October | 4.86 | 4.00 | 3.28 | 4.21 | 24.8 °C |
| November | 4.82 | 5.17 | 4.28 | 4.60 | 22.8 °C |
| December | 4.54 | 5.48 | 4.58 | 4.54 | 20.5 °C |
| Year | 4.91 avg | 3.61 avg | 1076 kWh | 1495 kWh |
Sizing example. To run a 1 kWh-per-day load through July on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 710 Wp of panels at 70°, versus 350 Wp at 20°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Nong Khai
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.
2.5 mrow pitch at 70°
2.6 mrow pitch at 20°
How Nong Khai compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
258thof 295 places in Thailand for sunshine, shared: 4.91 peak sun hours a day on flat ground.
−1%solar energy a year compared with the average place in Thailand: 1,495 against 1,509 kWh per kWp.
+16 mindaylight on the longest day, compared with Bangkok: 13 h 12 min against 12 h 56 min.
20°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); Nong Khai ranks joint 258th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 1.67 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 04 min, −15 min compared with Bangkok.
Solar forecast for Nong Khai, 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 Nong Khai
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Places near Nong Khai
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A free, live card for Nong Khai: 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.