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Rule Fog Hunter

Da Lat - Fog Hunter - Vietnam

Da Lat, Lâm Đồng Province, Vietnam

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread0.6°C
Visibility22942 (Clear)
Relative Humidity96%
Wind Speed0.5m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Ho_Chi_Minh
fog weather icon
Next opportunity
Dense Fog at Sunset
Da Lat
Mon, Jun 1 · 17:00–19:00 · 2h window
Low confidence
37%
🌫️Fog Probability75.8-91.1%
Dewpoint Spread: 0.1°C
Visibility: 7233 (Moderate)
Relative Humidity: 99%
Wind Speed: 1.3m/s (calm conditions)
fog weather icon
Dense Fog
Da Lat
Mon, Jun 1 · 19:00–02:00
🌫️Fog Probability:100%
High

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts when temperature inversions and morning mist create atmospheric conditions across Vietnam's mountain valleys, rice terraces, and karst landscapes. We track overnight cooling, humidity, topography, and seasonal patterns to identify when fog transforms Vietnam's highland regions into ethereal scenes.

Vietnam's dramatic elevation changes—from sea level to 10,000-foot peaks—create ideal conditions for fog formation in mountain valleys. Northern highlands around Sapa and Mu Cang Chai experience frequent morning fog, particularly during the transition between dry and wet seasons. Hill stations like Da Lat maintain cooler temperatures that promote mist formation even in tropical latitudes. The limestone karsts of Ha Long Bay and Ninh Binh develop ethereal fog conditions during cooler months.

What makes Vietnam fog photography special:

  • Terraced valleys - Sapa and Mu Cang Chai rice terraces emerge layer by layer as fog burns off, creating depth and mystery
  • Karst landscapes - Ha Long Bay limestone islands pierce through low-lying fog like ancient towers floating on clouds
  • Mountain village life - Traditional H'mong and Dao villages in Sapa appear and disappear through drifting mist during morning hours
  • Highland agriculture - Da Lat's flower farms and strawberry fields gain dreamlike quality under morning fog blankets

Sapa experiences its most reliable fog from September through November and March through May—transition seasons when temperature differentials are greatest. Early morning (5-8 AM) provides peak conditions as fog fills valleys while higher villages remain clear. Mu Cang Chai's deep valleys create spectacular inversions, especially during harvest season (late September) when golden rice terraces emerge through fog layers. Da Lat's elevation (1,500 meters) generates morning mist year-round, peaking December through March. Ninh Binh's karsts become most atmospheric during cooler months (November-February) when mist drifts through limestone formations. Arrive at viewpoints well before dawn—fog often dissipates quickly after sunrise.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 79 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Ho_Chi_Minh
Fog Probability
≥ 75.0%
Sun, May 24
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0030%
21:000%
22:000%
23:000%
Mon, May 25
24:000%
01:000%
02:0055%
03:0055%
04:0055%
05:0030%
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%
20:0055%
21:0055%
22:0030%
23:0030%
Tue, May 26
24:0030%
01:0030%
02:0055%
03:0055%
04:0055%
05:0055%
06:0053%
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%
20:0053%
21:0053%
22:0053%
23:000%
Wed, May 27
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%
16:0044%
17:0030%
18:0030%
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/Ho_Chi_Minh
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, May 24 Sunrise 05:21 Sunset 18:05
20:00
4% 17°C 0mm 96% 0cm -26° 17°C 0.75mm 0.08kPa 22942m 0.5m/s 0.54m/s
21:00
4% 17°C 0mm 96% 0cm -38° 17°C 1.7mm 0.07kPa 21401m 0.31m/s 0.34m/s
22:00
5% 17°C 0mm 96% 0cm -49° 17°C 2mm 0.09kPa 24134m 0.4m/s 0.4m/s
23:00
3% 17°C 0mm 96% 0cm -56° 17°C 2.9mm 0.09kPa 24134m 0.81m/s 0.86m/s
Mon, May 25 Sunrise 05:21 Sunset 18:05
24:00
2% 17°C 0mm 96% 0cm -57° 17°C 3.4mm 0.09kPa 24134m 1m/s 1.1m/s
01:00
0% 16°C 0mm 96% 0cm -52° 17°C 3.6mm 0.08kPa 24134m 0.71m/s 0.75m/s
02:00
2% 16°C 0mm 96% 0cm -43° 17°C 0.19mm 0.08kPa 24135m 0.62m/s 0.65m/s
03:00
4% 16°C 0mm 96% 0cm -32° 17°C 0.19mm 0.08kPa 24134m 0.72m/s 0.83m/s
04:00
6% 16°C 0mm 96% 0cm -19° 17°C 0.19mm 0.08kPa 24135m 0.91m/s 1m/s
05:00
7% 16°C 0mm 96% 0cm -5.5° 17°C 0.25mm 0.08kPa 24134m 0.7m/s 0.79m/s
06:00
8% 16°C 0mm 94% 0cm 8.2° 17°C 0.44mm 0.12kPa 24135m 0.61m/s 0.65m/s
07:00
9% 18°C 0mm 90% 0cm 22° 19°C 0.5mm 0.22kPa 24135m 1.2m/s 0.91m/s
08:00
8% 18°C 0mm 78% 0cm 36° 22°C 0mm 0.58kPa 24135m 1.5m/s 0.92m/s
09:00
7% 16°C 0mm 58% 0cm 50° 25°C 0.06mm 1.4kPa 24135m 0.72m/s 0.85m/s
10:00
6% 16°C 0mm 48% 0cm 64° 28°C 0.13mm 1.9kPa 24135m 0.93m/s 0.59m/s
11:00
4% 15°C 0mm 44% 0cm 76° 28°C 0.13mm 2.1kPa 24134m 1m/s 1.1m/s
12:00
2% 15°C 0mm 45% 0cm 80° 28°C 0.13mm 2.1kPa 21318m 1.6m/s 1.8m/s
13:00
0% 19°C 0.02mm 81% 0cm 70° 22°C 1mm 0.52kPa 9031m 2.9m/s 1.5m/s
14:00
5% 18°C 0.29mm 85% 0cm 56° 21°C 1.6mm 0.36kPa 5692m 1.2m/s 0.99m/s
15:00
9% 18°C 1.1mm 91% 0cm 42° 19°C 4.5mm 0.2kPa 8324m 1.2m/s 1.1m/s
16:00
14% 18°C 1.5mm 94% 0cm 28° 19°C 8.6mm 0.13kPa 5772m 1.6m/s 1.4m/s
17:00
13% 17°C 3.1mm 99% 0cm 14° 18°C 16mm 0.02kPa 1811m 2.6m/s 1.5m/s
18:00
12% 17°C 0.05mm 98% 0cm 0.84° 17°C 17mm 0.04kPa 24134m 0.8m/s 0.5m/s
19:00
11% 16°C 0mm 97% 0cm -13° 17°C 18mm 0.05kPa 24135m 2.1m/s 1.4m/s
20:00
14% 17°C 0mm 97% 0cm -26° 17°C 0.06mm 0.06kPa 24134m 1m/s 1.2m/s
21:00
18% 17°C 0mm 96% 0cm -38° 17°C 0.06mm 0.07kPa 24134m 0.83m/s 0.87m/s
22:00
21% 16°C 0mm 97% 0cm -48° 17°C 0.25mm 0.07kPa 24134m 0.61m/s 0.66m/s
23:00
22% 16°C 0mm 96% 0cm -55° 17°C 0.25mm 0.08kPa 24134m 0.81m/s 0.94m/s
Tue, May 26 Sunrise 05:21 Sunset 18:05
24:00
23% 16°C 0mm 96% 0cm -57° 17°C 0.25mm 0.07kPa 24135m 0.81m/s 0.96m/s
01:00
24% 16°C 0mm 96% 0cm -52° 17°C 0.31mm 0.07kPa 24134m 0.8m/s 0.94m/s
02:00
30% 16°C 0mm 96% 0cm -43° 17°C 0mm 0.08kPa 24135m 0.81m/s 0.97m/s
03:00
36% 16°C 0mm 96% 0cm -31° 17°C 0mm 0.08kPa 24134m 0.81m/s 1m/s
04:00
42% 16°C 0mm 96% 0cm -19° 16°C 0mm 0.07kPa 24135m 1m/s 1.2m/s
05:00
40% 16°C 0mm 97% 0cm -5.5° 16°C 0mm 0.06kPa 24134m 0.81m/s 0.98m/s
06:00
37% 16°C 0mm 95% 0cm 8.2° 17°C 0mm 0.1kPa 24134m 0.72m/s 0.89m/s
07:00
35% 18°C 0mm 87% 0cm 22° 20°C 0.06mm 0.3kPa 7012m 1.8m/s 1m/s
08:00
33% 18°C 0mm 76% 0cm 36° 22°C 0.25mm 0.63kPa 23976m 2.3m/s 1.2m/s
09:00
32% 17°C 0mm 67% 0cm 50° 24°C 0.44mm 0.95kPa 24135m 1.8m/s 1.5m/s
10:00
30% 16°C 0mm 52% 0cm 64° 27°C 0.44mm 1.7kPa 24134m 0.82m/s 1.4m/s
11:00
25% 16°C 0mm 51% 0cm 76° 27°C 0.63mm 1.7kPa 6495m 1m/s 1.4m/s
12:00
21% 17°C 0mm 60% 0cm 80° 26°C 1.3mm 1.3kPa 8704m 1.7m/s 1.9m/s
13:00
16% 18°C 0.05mm 71% 0cm 69° 24°C 2.3mm 0.85kPa 6808m 2.4m/s 1.2m/s
14:00
15% 19°C 0.02mm 76% 0cm 56° 23°C 1.2mm 0.68kPa 7499m 2.3m/s 0.59m/s
15:00
13% 18°C 0.02mm 88% 0cm 42° 20°C 2.5mm 0.27kPa 5263m 1.5m/s 0.95m/s
16:00
12% 17°C 0.1mm 91% 0cm 28° 19°C 4.6mm 0.2kPa 5046m 1.3m/s 1.1m/s
17:00
12% 18°C 0.38mm 95% 0cm 14° 18°C 5.9mm 0.1kPa 19292m 2m/s 1.5m/s
18:00
11% 17°C 0.25mm 97% 0cm 0.9° 18°C 6.7mm 0.07kPa 21179m 1.4m/s 1.2m/s
19:00
11% 17°C 0.03mm 97% 0cm -13° 17°C 7mm 0.06kPa 24134m 1.1m/s 1.4m/s
20:00
12% 17°C 0mm 96% 0cm -26° 18°C 0.06mm 0.09kPa 24134m 0.7m/s 0.83m/s
21:00
12% 17°C 0mm 96% 0cm -38° 18°C 0.19mm 0.09kPa 24135m 0.83m/s 0.93m/s
22:00
13% 17°C 0mm 95% 0cm -48° 18°C 0.19mm 0.1kPa 24135m 1m/s 1.2m/s
23:00
12% 17°C 0mm 95% 0cm -55° 17°C 0.19mm 0.1kPa 24134m 0.93m/s 1m/s
Wed, May 27 Sunrise 05:21 Sunset 18:05
24:00
12% 16°C 0mm 94% 0cm -57° 17°C 0.19mm 0.11kPa 24135m 0.81m/s 0.94m/s
01:00
11% 16°C 0mm 94% 0cm -52° 17°C 0.19mm 0.12kPa 24134m 0.92m/s 1.1m/s
02:00
12% 17°C 0mm 83% 0cm -43° 20°C 0.56mm 0.38kPa 23414m 0.88m/s 1m/s
03:00
14% 17°C 0mm 73% 0cm -31° 22°C 0.94mm 0.73kPa 22695m 0.84m/s 0.99m/s
04:00
15% 17°C 0mm 62% 0cm -19° 25°C 1.3mm 1.2kPa 21975m 0.8m/s 0.96m/s
05:00
13% 18°C 0mm 66% 0cm -5.5° 25°C 2mm 1.1kPa 21472m 0.9m/s 0.94m/s
06:00
12% 18°C 0mm 69% 0cm 8.2° 24°C 2.8mm 0.93kPa 20969m 1m/s 0.92m/s
07:00
10% 19°C 0mm 73% 0cm 22° 24°C 3.5mm 0.81kPa 20466m 1.1m/s 0.9m/s
08:00
13% 19°C 0.05mm 78% 0cm 36° 23°C 3.4mm 0.63kPa 16622m 1m/s 0.74m/s
09:00
15% 20°C 0.09mm 83% 0cm 50° 23°C 3.4mm 0.47kPa 12778m 0.99m/s 0.57m/s
10:00
18% 20°C 0.14mm 88% 0cm 64° 22°C 3.3mm 0.31kPa 8933m 0.93m/s 0.4m/s
11:00
15% 19°C 0.2mm 91% 0cm 76° 21°C 4.7mm 0.22kPa 14001m 0.93m/s 0.56m/s
12:00
12% 18°C 0.26mm 94% 0cm 80° 19°C 6.1mm 0.13kPa 19068m 0.94m/s 0.71m/s
13:00
9% 18°C 0.32mm 97% 0cm 69° 18°C 7.6mm 0.06kPa 24135m 0.94m/s 0.87m/s
14:00
8% 17°C 0.21mm 97% 0cm 56° 18°C 5.1mm 0.07kPa 24135m 0.87m/s 0.86m/s
15:00
6% 17°C 0.11mm 96% 0cm 42° 18°C 2.6mm 0.08kPa 24135m 0.8m/s 0.85m/s
16:00
5% 17°C 0mm 96% 0cm 28° 18°C 0.13mm 0.08kPa 24135m 0.73m/s 0.83m/s
17:00
5% 17°C 0mm 96% 0cm 14° 17°C 0.23mm 0.08kPa 24135m 0.81m/s 0.93m/s
18:00
6% 17°C 0mm 96% 0cm 0.95° 17°C 0.33mm 0.08kPa 24135m 0.89m/s 1m/s
19:00
6% 16°C 0mm 96% 0cm -13° 17°C 0.44mm 0.08kPa 24135m 0.97m/s 1.1m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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