Ca Mau · Vietnam · 9.23° N · 105.46° E
Solar position in Giá Rai
Sun position, daylight and the best solar panel angle for Giá Rai — computed for 9.23° N, 105.46° E, 4 m above sea level.
The sun right now
Sun in Giá Rai today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:35 | sun 18° below horizon |
| Nautical dawn | 05:00 | 12° below |
| Civil dawn | 05:25 | 6° below |
| Sunrise | 05:46 | 102° ESE |
| Golden hour ends | 06:15 | sun 6° up |
| Solar noon | 11:42 | 68.7° high |
| Golden hour starts | 17:09 | sun 6° up |
| Sunset | 17:37 | 258° WSW |
| Civil dusk | 17:59 | 6° below |
| Nautical dusk | 18:23 | 12° below |
| Astronomical dusk | 18:48 | 18° below |
| Day length | 11 h 51 min | |
Sun path diagram for Giá Rai
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 75.8° at solar noon in Giá Rai; on the December solstice only 57.3°. 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 | 06:19 | 12:09 | 17:59 | 11 h 40 min | 60.9° |
| February | 06:15 | 12:11 | 18:08 | 11 h 53 min | 70.2° |
| March | 06:02 | 12:05 | 18:08 | 12 h 07 min | 81.0° |
| April | 05:45 | 11:56 | 18:08 | 12 h 22 min | 87.4° |
| May | 05:37 | 11:54 | 18:12 | 12 h 35 min | 79.1° |
| June | 05:40 | 11:59 | 18:19 | 12 h 40 min | 75.8° |
| July | 05:47 | 12:04 | 18:22 | 12 h 35 min | 78.8° |
| August | 05:49 | 12:01 | 18:12 | 12 h 23 min | 87.1° |
| September | 05:47 | 11:51 | 17:55 | 12 h 07 min | 81.5° |
| October | 05:46 | 11:42 | 17:39 | 11 h 53 min | 70.1° |
| November | 05:53 | 11:43 | 17:34 | 11 h 40 min | 60.9° |
| December | 06:08 | 11:56 | 17:43 | 11 h 35 min | 57.3° |
A year of daylight in Giá Rai
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 Giá Rai
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
10°collects the most energy over a year: 1456 kWh per kWp.
0°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° off-grid best | 1440 | 99% | 3.57 | 1.3× |
| 9° = latitude | 1456 | 100% | 3.43 | 1.4× |
| 10° year-round best | 1456 | 100% | 3.41 | 1.4× |
| 15° | 1451 | 100% | 3.30 | 1.5× |
| 30° | 1384 | 95% | 2.87 | 1.7× |
| 45° | 1244 | 85% | 2.30 | 2.0× |
| 60° | 1041 | 71% | 1.65 | 2.6× |
| 70° | 883 | 61% | 1.25 | 3.1× |
| 90° | 603 | 41% | 1.02 | 2.8× |
A fixed array in Giá Rai produces the most over a year at 10°. The design month for an off-grid system is July: at 0° it makes 3.57 kWh per kWp a day, 5% more than at 10°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Giá Rai at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 10° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 10° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.98 | 4.61 | 3.77 | 4.25 | 25.8 °C |
| February | 5.75 | 4.50 | 3.66 | 4.78 | 26.8 °C |
| March | 6.07 | 3.65 | 2.95 | 4.86 | 28.3 °C |
| April | 5.98 | 2.47 | 1.96 | 4.60 | 29.5 °C |
| May | 5.12 | 1.73 | 1.35 | 3.85 | 29.1 °C |
| June | 4.67 | 1.54 | 1.20 | 3.49 | 27.9 °C |
| July | 4.52 | 1.60 | 1.25 | 3.41 | 27.4 °C |
| August | 4.65 | 1.97 | 1.56 | 3.58 | 27.2 °C |
| September | 4.56 | 2.54 | 2.04 | 3.60 | 27.1 °C |
| October | 4.59 | 3.24 | 2.62 | 3.74 | 27.0 °C |
| November | 4.65 | 4.02 | 3.27 | 3.91 | 26.7 °C |
| December | 4.52 | 4.28 | 3.50 | 3.86 | 25.9 °C |
| Year | 5.00 avg | 3.00 avg | 883 kWh | 1456 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 980 Wp of panels at 70°, versus 350 Wp at 10°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Giá Rai
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.
2.0 mrow pitch at 70°
2.2 mrow pitch at 10°
How Giá Rai compares in Vietnam
Against the other 306 places in Vietnam with climate data, for a fixed array at its best angle.
118thof 307 places in Vietnam for sunshine, shared: 5.00 peak sun hours a day on flat ground.
+10%solar energy a year compared with the average place in Vietnam: 1,456 against 1,320 kWh per kWp.
−6 mindaylight on the longest day, compared with Ho Chi Minh City: 12 h 40 min against 12 h 46 min.
10°best year-round tilt here; across Vietnam it runs from 9° in Vĩnh Châu to 21° in Dien Bien Phu.
Of the 307 places in Vietnam, Phú Quý gets the most sun (5.45 peak sun hours a day) and Thị Trấn Thất Khê and one other place the least (3.61); Giá Rai ranks joint 118th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.20 kWh a day here, against 1.53 kWh on average in Vietnam. The shortest day lasts 11 h 35 min, +6 min compared with Ho Chi Minh City.
Solar forecast for Giá Rai, 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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A free, live card for Giá Rai: 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.