Chiang Mai · Thailand · 18.63° N · 98.90° E
Solar position in San Pa Tong
Sun position, daylight and the best solar panel angle for San Pa Tong — computed for 18.63° N, 98.90° E, 300 m above sea level.
The sun right now
Sun in San Pa Tong today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:07 | sun 18° below horizon |
| Nautical dawn | 05:33 | 12° below |
| Civil dawn | 05:59 | 6° below |
| Sunrise | 06:21 | 102° ESE |
| Golden hour ends | 06:51 | sun 6° up |
| Solar noon | 12:08 | 59.3° high |
| Golden hour starts | 17:25 | sun 6° up |
| Sunset | 17:55 | 257° WSW |
| Civil dusk | 18:17 | 6° below |
| Nautical dusk | 18:43 | 12° below |
| Astronomical dusk | 19:08 | 18° below |
| Day length | 11 h 34 min | |
Sun path diagram for San Pa Tong
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 85.2° at solar noon in San Pa Tong; on the December solstice only 47.9°. Sunrise swings from 65° ENE in June to 115° ESE in December — a 50° 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 | 06:59 | 12:35 | 18:11 | 11 h 12 min | 51.5° |
| February | 06:48 | 12:38 | 18:27 | 11 h 38 min | 60.8° |
| March | 06:28 | 12:31 | 18:35 | 12 h 08 min | 71.6° |
| April | 06:03 | 12:23 | 18:43 | 12 h 40 min | 83.2° |
| May | 05:48 | 12:20 | 18:53 | 13 h 05 min | 88.4° |
| June | 05:48 | 12:26 | 19:03 | 13 h 15 min | 85.2° |
| July | 05:58 | 12:30 | 19:03 | 13 h 05 min | 88.2° |
| August | 06:07 | 12:27 | 18:47 | 12 h 40 min | 83.5° |
| September | 06:13 | 12:17 | 18:21 | 12 h 09 min | 72.1° |
| October | 06:20 | 12:08 | 17:57 | 11 h 38 min | 60.7° |
| November | 06:34 | 12:10 | 17:45 | 11 h 12 min | 51.5° |
| December | 06:51 | 12:22 | 17:52 | 11 h 01 min | 47.9° |
A year of daylight in San Pa Tong
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 San Pa Tong
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
21°collects the most energy over a year: 1495 kWh per kWp.
2°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 | August kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1416 | 95% | 3.38 | 1.4× |
| 2° off-grid best | 1430 | 96% | 3.38 | 1.4× |
| 15° | 1489 | 100% | 3.32 | 1.4× |
| 19° = latitude | 1495 | 100% | 3.28 | 1.5× |
| 21° year-round best | 1495 | 100% | 3.25 | 1.5× |
| 30° | 1481 | 99% | 3.10 | 1.6× |
| 45° | 1392 | 93% | 2.74 | 1.9× |
| 60° | 1230 | 82% | 2.25 | 2.3× |
| 70° | 1087 | 73% | 1.88 | 2.6× |
| 90° | 770 | 51% | 1.14 | 3.1× |
A fixed array in San Pa Tong produces the most over a year at 21°. The design month for an off-grid system is August: at 2° it makes 3.38 kWh per kWp a day, 4% more than at 21°, and costs 4% of the yearly total. Why steep panels win winter.
Off-grid solar in San Pa Tong at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 21° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 21° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.61 | 5.34 | 4.47 | 4.59 | 19.9 °C |
| February | 5.32 | 5.03 | 4.17 | 4.89 | 22.4 °C |
| March | 5.63 | 4.10 | 3.35 | 4.72 | 25.3 °C |
| April | 6.02 | 3.24 | 2.61 | 4.64 | 27.7 °C |
| May | 5.46 | 2.40 | 1.93 | 4.03 | 26.2 °C |
| June | 4.77 | 2.13 | 1.70 | 3.49 | 25.1 °C |
| July | 4.39 | 2.11 | 1.69 | 3.25 | 24.5 °C |
| August | 4.24 | 2.33 | 1.88 | 3.25 | 24.1 °C |
| September | 4.55 | 3.00 | 2.45 | 3.67 | 24.1 °C |
| October | 4.44 | 3.67 | 3.02 | 3.86 | 23.2 °C |
| November | 4.58 | 4.94 | 4.12 | 4.42 | 21.4 °C |
| December | 4.34 | 5.29 | 4.44 | 4.41 | 19.4 °C |
| Year | 4.86 avg | 3.62 avg | 1087 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 700 Wp of panels at 70°, versus 360 Wp at 21°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in San Pa Tong
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.
2.6 mrow pitch at 70°
2.6 mrow pitch at 21°
How San Pa Tong compares in Thailand
Against the other 294 places in Thailand with climate data, for a fixed array at its best angle.
277thof 295 places in Thailand for sunshine, shared: 4.86 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.
+19 mindaylight on the longest day, compared with Bangkok: 13 h 15 min against 12 h 56 min.
21°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); San Pa Tong ranks joint 277th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 1.69 kWh a day here, against 1.53 kWh on average in Thailand. The shortest day lasts 11 h 01 min, −18 min compared with Bangkok.
Solar forecast for San Pa Tong, 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 San Pa Tong
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Places near San Pa Tong
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A free, live card for San Pa Tong: 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.