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Rule Golden Hour

Golden Hour Forecast for Ha Long Bay, Vietnam

Ha Long, Quảng Ninh, Vietnam

The view layers Ha Long Bay's limestone towers from a boat or high viewpoint, using a junk silhouette and open water to separate overlapping karst forms.

Currently

Real-time conditions
Low Cloud Cover100%
Mid Cloud Cover100%
High Cloud Cover100%
Sun Elevation-34.0° (Astronomical night)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Bangkok

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (85-hour forecast)

  • Golden Hour Potential100% of hours
  • Precipitation Chance100% of hours
  • Golden Hour83% of hours

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Golden Hour conditions across Vietnam. The requirements and hourly values below show how those signals apply at Ha Long Bay.

Explore Golden Hour conditions across Vietnam →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at Ha Long Bay during the last 365 days.

Last 30 days
2
recorded matching windows · 80% average confidence
Last 90 days
11
recorded matching windows · 71% average confidence
Last 365 days
54
recorded matching windows · 76% average confidence
Most frequent recorded start hour

18:00 local time, shared by 30 of 54 matches recorded in the last 365 days.

Most represented month

April, with 26 of 54 matches recorded in the last 365 days.

These figures use completed PhotoWeather MatchEvent records from the previous 365 days only. They describe recorded forecast matches, not observations, climatological probability, or a guarantee of future conditions.

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85-hour requirements breakdown

When available, the detailed table below covers only the stated 85-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the next 14 days, so this table does not explain that entire 14-day period.

What passed or failed, hour by hour
0matching hours in the next 85 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Bangkok
Golden Hour
Any
Golden Hour Potential
≥ 80.0%
Precipitation Chance
≤ 5.0%
Visibility
≥ 1000.0m
Sat, Aug 22
12:0014%91%3411m
13:0014%93%3519m
14:0014%98%4798m
15:0014%96%19997m
16:0012%94%10793m
17:0036%95%5563m
18:0042%96%11332m
19:0014%96%3292m
20:0014%91%18233m
21:0011%83%5537m
22:009%75%4007m
23:009%79%1336m
Sun, Aug 23
24:0014%83%9161m
01:0014%87%9490m
02:0014%88%19014m
03:0012%88%5206m
04:0014%89%4530m
05:0035%91%3594m
06:0029%93%1192m
07:009%96%472m
08:009%93%278m
09:0011%91%190m
10:0012%88%470m
11:0014%91%1681m
12:0014%94%3210m
13:0012%96%3767m
14:0014%95%7516m
15:0014%94%14572m
16:0014%93%15152m
17:0045%95%16204m
18:0046%96%21484m
19:0014%98%18039m
20:0014%96%21920m
21:0014%95%24134m
22:0014%94%23165m
23:0015%94%19268m
Mon, Aug 24
24:0018%94%23462m
01:0017%95%19515m
02:0021%92%8274m
03:0021%89%23885m
04:0026%86%24134m
05:0065%90%24134m
06:0064%95%24134m
07:0023%99%24134m
08:0022%99%24134m
09:0023%99%8880m
10:0027%99%22963m
11:0026%99%23374m
12:0026%98%11996m
13:0020%98%12293m
14:0020%83%9989m
15:0020%68%12898m
16:0023%53%18350m
17:0068%60%24134m
18:0067%68%24134m
19:0024%75%24134m
20:0024%72%24134m
21:0024%68%24135m
22:0024%65%24134m
23:0024%70%24135m
Tue, Aug 25
24:0024%75%24134m
01:0024%81%24135m
02:0024%84%24134m
03:0024%87%24134m
04:0024%90%24134m
05:0067%93%24135m
06:0058%96%24134m
07:0024%98%24134m
08:000%98%19227m
09:000%97%14319m
10:000%97%9412m
11:000%96%10049m
12:000%94%10686m
13:000%93%11324m
14:000%75%11254m
15:000%57%11184m
16:000%38%11115m
17:0048%46%9968m
18:0048%54%8822m
19:000%62%7676m
20:000%68%11605m
21:000%73%15533m
22:000%78%19462m
23:000%80%21020m
Wed, Aug 26
24:000%83%22577m
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Golden Hour Potential mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time
Asia/Bangkok
Golden Hour
High Clouds
%
Low Clouds
%
Mid-Level Clouds
%
Relative Humidity
%
Solar Elevation
°
Total Cloud Coverage
%
Wind Speed
m/s
Sun, Aug 23 Sunrise 05:32 Sunset 18:16
03:00
- 100% 100% 100% 97% -34° 100% 4.1m/s
04:00
- 100% 100% 100% 98% -22° 100% 3.6m/s
05:00
- 100% 100% 95% 99% -8.2° 100% 3.4m/s
06:00
- 100% 100% 90% 99% 5.5° 100% 2.9m/s
07:00
- 100% 100% 100% 99% 19° 100% 2.8m/s
08:00
- 100% 100% 100% 99% 33° 100% 2.8m/s
09:00
- 100% 100% 61% 99% 47° 100% 3.2m/s
10:00
- 100% 100% 13% 98% 61° 100% 4m/s
11:00
- 100% 100% 17% 97% 74° 100% 4.2m/s
12:00
- 100% 100% 39% 97% 80° 100% 4.3m/s
13:00
- 100% 100% 20% 96% 72° 100% 5.1m/s
14:00
- 28% 100% 3% 96% 58° 100% 4.4m/s
15:00
- 17% 100% 0% 95% 45° 100% 3.6m/s
16:00
- 74% 100% 0% 95% 31° 100% 3.6m/s
17:00
- 96% 97% 1% 95% 17° 100% 2.8m/s
18:00
- 100% 94% 6% 95% 100% 2.3m/s
19:00
- 100% 77% 0% 95% -11° 100% 2.1m/s
20:00
- 100% 67% 0% 95% -24° 100% 2.2m/s
21:00
- 100% 63% 0% 94% -36° 100% 1.4m/s
22:00
- 100% 65% 1% 94% -47° 100% 1.4m/s
23:00
- 100% 55% 0% 93% -55° 100% 1m/s
Mon, Aug 24 Sunrise 05:33 Sunset 18:15
24:00
- 99% 24% 0% 93% -58° 99% 0.63m/s
01:00
- 100% 42% 0% 94% -54° 100% 0.59m/s
02:00
- 100% 30% 9% 95% -45° 100% 1m/s
03:00
- 100% 7% 0% 95% -34° 100% 1.3m/s
04:00
- 98% 7% 0% 95% -22° 98% 1.3m/s
05:00
- 100% 4% 0% 95% -8.3° 100% 1.4m/s
06:00
- 92% 4% 0% 95% 5.5° 92% 1.6m/s
07:00
- 64% 0% 0% 92% 19° 64% 1.3m/s
08:00
- 44% 4% 1% 86% 33° 44% 1.4m/s
09:00
- 99% 5% 2% 78% 47° 99% 1.2m/s
10:00
- 93% 6% 0% 78% 61° 93% 2m/s
11:00
- 100% 18% 0% 78% 74° 100% 2.3m/s
12:00
- 100% 34% 0% 78% 80° 100% 2.5m/s
13:00
- 100% 35% 0% 82% 71° 100% 2.4m/s
14:00
- 100% 30% 0% 84% 58° 100% 2.1m/s
15:00
- 100% 26% 0% 83% 44° 100% 1.9m/s
16:00
- 100% 4% 0% 85% 30° 100% 1.7m/s
17:00
- 100% 0% 0% 86% 16° 100% 1.6m/s
18:00
- 100% 2% 1% 89% 2.8° 100% 1.5m/s
19:00
- 100% 0% 0% 91% -11° 100% 0.99m/s
20:00
- 100% 0% 0% 92% -24° 100% 0.83m/s
21:00
- 100% 1% 0% 93% -37° 100% 0.36m/s
22:00
- 100% 1% 0% 93% -48° 100% 0.16m/s
23:00
- 100% 2% 0% 94% -55° 100% 0.22m/s
Tue, Aug 25 Sunrise 05:33 Sunset 18:14
24:00
- 100% 2% 1% 94% -58° 100% 0.59m/s
01:00
- 100% 2% 0% 94% -54° 100% 0.78m/s
02:00
- 100% 2% 0% 94% -46° 100% 0.84m/s
03:00
- 100% 1% 0% 94% -34° 100% 0.87m/s
04:00
- 100% 0% 0% 94% -22° 100% 0.96m/s
05:00
- 100% 0% 19% 94% -8.4° 100% 1.2m/s
06:00
- 100% 1% 88% 94% 5.4° 100% 1.2m/s
07:00
- 100% 0% 44% 92% 19° 100% 1m/s
08:00
- 100% 5% 29% 89% 33° 100% 1.2m/s
09:00
- 100% 10% 15% 86% 47° 100% 1.4m/s
10:00
- 100% 15% 0% 82% 61° 100% 1.6m/s
11:00
- 100% 12% 33% 85% 74° 100% 1.4m/s
12:00
- 99% 9% 66% 87% 80° 100% 1.2m/s
13:00
- 99% 6% 98% 89% 71° 100% 0.92m/s
14:00
- 99% 9% 78% 90% 58° 100% 0.91m/s
15:00
- 100% 12% 57% 91% 44° 100% 0.89m/s
16:00
- 100% 15% 36% 92% 30° 100% 0.87m/s
17:00
- 100% 14% 50% 93% 16° 100% 1m/s
18:00
- 100% 13% 65% 94% 2.6° 100% 1.2m/s
19:00
- 100% 13% 79% 95% -11° 100% 1.3m/s
20:00
- 100% 13% 82% 95% -24° 100% 1.3m/s
21:00
- 100% 12% 85% 95% -37° 100% 1.4m/s
22:00
- 100% 12% 88% 94% -48° 100% 1.4m/s
23:00
- 95% 11% 92% 94% -56° 100% 1.4m/s
Wed, Aug 26 Sunrise 05:33 Sunset 18:13
24:00
- 91% 10% 96% 94% -58° 100% 1.5m/s
01:00
- 86% 8% 100% 94% -55° 100% 1.5m/s
02:00
- 85% 12% 97% 92% -46° 97% 1.5m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

How this forecast is made

Opportunities are threshold-based signals: PhotoWeather checks whether forecast conditions match the rules for a photography scenario. They are planning guidance, not guarantees. Forecasts can change as new model runs arrive, and confidence generally decreases farther into the forecast horizon, so recheck conditions before travelling.

The weather forecast foundation comes through Open-Meteo , which aggregates models from weather agencies. PhotoWeather applies condition-specific thresholds and derived calculations; not every condition uses every model or data input.

Forecast generated

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