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Rule Fog Hunter

Fog Hunter Forecast for Sapa, Vietnam

Sa Pa, Lào Cai Province, Vietnam

Sapa's terrace walls wrap around steep valleys as dense contour lines. Paths, farmhouses, and field workers clarify the scale of cultivated slopes that would otherwise read as an abstract pattern.

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread0.7°C
Visibility11495 (Clear)
Relative Humidity96%
Wind Speed1.1m/s (calm conditions)

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)

  • Fog Probability100% of hours

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Fog Hunter conditions across Vietnam. The requirements and hourly values below show how those signals apply at Sapa.

Explore Fog Hunter conditions across Vietnam →

Recorded match history

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

Last 30 days
1
recorded matching window · 41% average confidence
Last 90 days
39
recorded matching windows · 75% average confidence
Last 365 days
46
recorded matching windows · 73% average confidence
Most frequent recorded start hour

02:00 local time, shared by 12 of 46 matches recorded in the last 365 days.

Most represented month

June, with 20 of 46 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
Fog Probability
≥ 75.0%
Sat, Aug 22
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sun, Aug 23
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0039%
21:0039%
22:000%
23:000%
Mon, Aug 24
24:000%
01:000%
02:0055%
03:0032%
04:0039%
05:000%
06:000%
07:000%
08:0031%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0055%
21:0029%
22:0029%
23:000%
Tue, Aug 25
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:0029%
07:0027%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Aug 26
24:000%
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Fog Probability 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
Clear Sky Probability (Ensemble)
%
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Solar Elevation
°
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Sun, Aug 23 Sunrise 05:44 Sunset 18:30
03:00 ☾
1% 19°C 0mm 96% 0cm -36° 19°C 2.7mm 0.1kPa 11495m 1.1m/s 1.1m/s
04:00 ☾
1% 19°C 0.01mm 95% 0cm -24° 19°C 3.2mm 0.11kPa 16830m 0.94m/s 0.98m/s
05:00 ☾
1% 19°C 0.99mm 97% 0cm -11° 19°C 3.9mm 0.06kPa 11369m 1.1m/s 1.3m/s
06:00 ☾
1% 19°C 2.1mm 99% 0cm 2.9° 19°C 6.4mm 0.03kPa 8090m 1.3m/s 1.2m/s
07:00
1% 19°C 0.29mm 99% 0cm 16° 19°C 7.6mm 0.03kPa 10950m 2m/s 1.5m/s
08:00
3% 19°C 1mm 98% 0cm 30° 19°C 1.1mm 0.03kPa 10653m 1.6m/s 1.2m/s
09:00
6% 19°C 0.95mm 98% 0cm 44° 20°C 2.4mm 0.04kPa 11863m 1.5m/s 0.81m/s
10:00
8% 20°C 0.34mm 99% 0cm 58° 20°C 3.3mm 0.03kPa 22944m 2.6m/s 1.3m/s
11:00
8% 20°C 0mm 97% 0cm 71° 21°C 3.4mm 0.07kPa 22922m 2.3m/s 1.3m/s
12:00
8% 21°C 0mm 80% 0cm 79° 24°C 3.9mm 0.6kPa 16385m 2.2m/s 1.5m/s
13:00
8% 21°C 0mm 82% 0cm 73° 24°C 5mm 0.55kPa 8252m 2.7m/s 1.5m/s
14:00
8% 22°C 0mm 96% 0cm 61° 22°C 0.94mm 0.12kPa 8232m 2.4m/s 1.1m/s
15:00
7% 22°C 0mm 97% 0cm 47° 22°C 1.9mm 0.09kPa 12494m 2.3m/s 1.1m/s
16:00
7% 21°C 0mm 97% 0cm 34° 22°C 2.7mm 0.09kPa 16683m 2.3m/s 1.2m/s
17:00
7% 20°C 0mm 97% 0cm 20° 21°C 3.5mm 0.08kPa 8440m 2.1m/s 1.8m/s
18:00
8% 20°C 0.01mm 96% 0cm 6.1° 20°C 4.4mm 0.09kPa 11388m 1.5m/s 1.7m/s
19:00 ☾
8% 20°C 0mm 96% 0cm -7.5° 20°C 4.7mm 0.1kPa 23570m 1.5m/s 1.8m/s
20:00 ☾
8% 20°C 0.02mm 97% 0cm -21° 20°C 0.5mm 0.06kPa 19924m 2.1m/s 2.1m/s
21:00 ☾
7% 20°C 0mm 97% 0cm -33° 20°C 0.81mm 0.06kPa 18622m 2.2m/s 2.3m/s
22:00 ☾
7% 19°C 0mm 97% 0cm -44° 20°C 1.1mm 0.06kPa 22465m 2.8m/s 2.3m/s
23:00 ☾
7% 19°C 0mm 97% 0cm -53° 20°C 1.4mm 0.06kPa 22088m 3.1m/s 2.4m/s
Mon, Aug 24 Sunrise 05:44 Sunset 18:29
24:00 ☾
7% 19°C 0mm 98% 0cm -56° 20°C 1.6mm 0.06kPa 22554m 3.2m/s 2.4m/s
01:00 ☾
7% 19°C 0mm 97% 0cm -54° 20°C 1.8mm 0.06kPa 24135m 3.2m/s 2.4m/s
02:00 ☾
8% 19°C 0mm 97% 0cm -47° 20°C 0.19mm 0.07kPa 24134m 3.1m/s 2.3m/s
03:00 ☾
9% 19°C 0mm 97% 0cm -36° 20°C 0.44mm 0.07kPa 20945m 3.1m/s 2.3m/s
04:00 ☾
10% 19°C 0mm 97% 0cm -24° 19°C 0.81mm 0.06kPa 17957m 2.9m/s 2.2m/s
05:00 ☾
10% 19°C 0mm 97% 0cm -11° 19°C 1.3mm 0.06kPa 21310m 2.9m/s 2.1m/s
06:00 ☾
9% 19°C 0mm 97% 0cm 2.9° 19°C 1.6mm 0.06kPa 17434m 2.9m/s 2.2m/s
07:00
9% 19°C 0.01mm 96% 0cm 16° 20°C 2.1mm 0.08kPa 19401m 3.1m/s 2.1m/s
08:00
8% 20°C 0mm 97% 0cm 30° 20°C 0.69mm 0.07kPa 12342m 2.5m/s 2m/s
09:00
7% 20°C 0mm 98% 0cm 44° 20°C 1.1mm 0.06kPa 15440m 2.6m/s 2m/s
10:00
6% 20°C 0mm 97% 0cm 58° 20°C 1.7mm 0.06kPa 10703m 2.5m/s 2m/s
11:00
5% 20°C 0mm 97% 0cm 70° 21°C 2.3mm 0.07kPa 8250m 2.8m/s 1.9m/s
12:00
3% 21°C 0mm 96% 0cm 79° 21°C 2.9mm 0.11kPa 12597m 2.8m/s 1.8m/s
13:00
2% 21°C 0mm 82% 0cm 73° 24°C 3.7mm 0.53kPa 11865m 2.2m/s 1.2m/s
14:00
2% 21°C 0mm 77% 0cm 61° 25°C 0.75mm 0.73kPa 9638m 2.3m/s 0.85m/s
15:00
1% 21°C 0mm 82% 0cm 47° 25°C 1.8mm 0.57kPa 7217m 2.2m/s 0.92m/s
16:00
1% 23°C 0mm 94% 0cm 33° 24°C 2.7mm 0.17kPa 8789m 2.4m/s 1.2m/s
17:00
1% 22°C 0mm 96% 0cm 20° 22°C 3.6mm 0.11kPa 12137m 1.9m/s 1.4m/s
18:00
1% 20°C 0mm 96% 0cm 5.9° 21°C 4.7mm 0.09kPa 15754m 1.9m/s 1.8m/s
19:00 ☾
1% 19°C 0mm 97% 0cm -7.8° 20°C 5.2mm 0.07kPa 22768m 1.5m/s 2m/s
20:00 ☾
2% 19°C 0mm 96% 0cm -21° 19°C 0.13mm 0.08kPa 24134m 1.5m/s 1.9m/s
21:00 ☾
2% 19°C 0mm 96% 0cm -33° 19°C 0.38mm 0.09kPa 24135m 1.4m/s 1.9m/s
22:00 ☾
3% 19°C 0mm 95% 0cm -44° 19°C 0.69mm 0.1kPa 24134m 1.3m/s 1.7m/s
23:00 ☾
3% 19°C 0mm 94% 0cm -53° 20°C 1mm 0.13kPa 24135m 1.2m/s 1.4m/s
Tue, Aug 25 Sunrise 05:45 Sunset 18:28
24:00 ☾
2% 19°C 0mm 93% 0cm -57° 20°C 1.3mm 0.16kPa 24134m 1m/s 1.2m/s
01:00 ☾
2% 18°C 0mm 93% 0cm -54° 20°C 1.4mm 0.17kPa 24135m 0.82m/s 0.93m/s
02:00 ☾
2% 18°C 0mm 94% 0cm -47° 19°C 0mm 0.14kPa 24134m 0.61m/s 0.64m/s
03:00 ☾
3% 18°C 0mm 94% 0cm -36° 19°C 0.06mm 0.12kPa 24134m 0.63m/s 0.56m/s
04:00 ☾
3% 18°C 0mm 95% 0cm -24° 19°C 0.06mm 0.11kPa 24134m 0.7m/s 0.74m/s
05:00 ☾
2% 18°C 0mm 95% 0cm -11° 18°C 0.13mm 0.11kPa 24135m 0.71m/s 0.67m/s
06:00 ☾
2% 18°C 0.04mm 95% 0cm 2.8° 19°C 0.25mm 0.11kPa 22047m 0.81m/s 0.82m/s
07:00
1% 19°C 0.38mm 96% 0cm 16° 19°C 0.81mm 0.08kPa 14459m 0.73m/s 0.69m/s
08:00
1% 20°C 0.3mm 94% 0cm 30° 21°C 1.2mm 0.17kPa 17684m 0.76m/s 0.7m/s
09:00
2% 22°C 0.21mm 91% 0cm 44° 24°C 1.6mm 0.27kPa 20909m 0.79m/s 0.71m/s
10:00
2% 24°C 0.13mm 88% 0cm 58° 26°C 2.1mm 0.41kPa 24135m 0.82m/s 0.73m/s
11:00
2% 24°C 0.16mm 88% 0cm 70° 26°C 2.4mm 0.39kPa 22906m 0.79m/s 0.7m/s
12:00
1% 23°C 0.18mm 89% 0cm 78° 25°C 2.6mm 0.36kPa 21678m 0.77m/s 0.67m/s
13:00
1% 23°C 0.21mm 89% 0cm 73° 25°C 2.9mm 0.34kPa 20449m 0.75m/s 0.64m/s
14:00
1% 23°C 0.14mm 91% 0cm 61° 24°C 2.5mm 0.26kPa 19730m 0.81m/s 0.75m/s
15:00
0% 23°C 0.07mm 93% 0cm 47° 24°C 2.1mm 0.19kPa 19010m 0.87m/s 0.86m/s
16:00
0% 22°C 0mm 95% 0cm 33° 23°C 1.6mm 0.13kPa 18291m 0.93m/s 0.96m/s
17:00
0% 22°C 0.1mm 96% 0cm 19° 23°C 2.4mm 0.11kPa 18060m 1.2m/s 0.99m/s
18:00
0% 22°C 0.21mm 97% 0cm 5.7° 23°C 3.1mm 0.1kPa 17830m 1.4m/s 1m/s
19:00 ☾
0% 22°C 0.31mm 97% 0cm -8° 23°C 3.8mm 0.08kPa 17599m 1.6m/s 1m/s
20:00 ☾
0% 22°C 0.24mm 98% 0cm -21° 23°C 3.2mm 0.07kPa 16138m 1.2m/s 0.73m/s
21:00 ☾
0% 22°C 0.17mm 98% 0cm -34° 23°C 2.6mm 0.06kPa 14677m 0.77m/s 0.43m/s
22:00 ☾
0% 22°C 0.1mm 98% 0cm -45° 23°C 2.1mm 0.05kPa 13216m 0.33m/s 0.13m/s
23:00 ☾
0% 22°C 0.17mm 99% 0cm -53° 23°C 3.5mm 0.04kPa 11309m 0.3m/s 0.12m/s
Wed, Aug 26 Sunrise 05:45 Sunset 18:27
24:00 ☾
0% 23°C 0.23mm 99% 0cm -57° 23°C 5mm 0.03kPa 9401m 0.27m/s 0.11m/s
01:00 ☾
0% 23°C 0.3mm 99% 0cm -55° 23°C 6.5mm 0.02kPa 7494m 0.24m/s 0.1m/s
02:00 ☾
0% 23°C 0.59mm 98% 0cm -47° 23°C 6.3mm 0.06kPa 6638m 0.38m/s 0.27m/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.

How opportunities work → Weather data sources →
Forecast generated

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