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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
Fog Probability
0%
Dewpoint Spread15.6°C
Visibility24135 (Clear)
Relative Humidity38%
Wind Speed0.4m/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
Moderate Fog
Da Lat
Thu, Apr 16 · 22:00–23:00 · 1h window
Medium confidence
44%
🌫️Fog Probability79.7%
Dewpoint Spread: 0.4°C
Visibility: 24135 (Clear)
Relative Humidity: 97%
Wind Speed: 1.1m/s (calm conditions)

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
4matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Ho_Chi_Minh
Fog Probability
≥ 60.0%
Wed, Apr 8
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0076%
21:0081%
22:0087%
23:0080%
Thu, Apr 9
24:0059%
01:0019%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
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23:000%
Fri, Apr 10
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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16:000%
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20:000%
21:000%
22:000%
23:000%
Sat, Apr 11
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
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20:000%
21:000%
22:000%
23:000%
Sun, Apr 12
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
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/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
Thu, Apr 9 Sunrise 05:37 Sunset 17:57
09:00 ☾
58% 12°C 0mm 38% 0cm 48° 28°C 0mm 2.3kPa 24135m 2.2m/s 0.42m/s
10:00 ☾
79% 10°C 0mm 30% 0cm 63° 30°C 0mm 3kPa 24135m 2.2m/s 0.02m/s
11:00 ☾
84% 9.9°C 0mm 26% 0cm 77° 32°C 0mm 3.5kPa 24135m 2.2m/s 0.97m/s
12:00 ☾
90% 9.9°C 0mm 27% 0cm 85° 31°C 0mm 3.4kPa 24134m 1.9m/s 2.2m/s
13:00 ☾
95% 10°C 0mm 27% 0cm 72° 31°C 0mm 3.3kPa 24134m 3.3m/s 2.6m/s
14:00 ☾
68% 11°C 0.01mm 35% 0cm 57° 28°C 0mm 2.4kPa 24134m 2.1m/s 2.1m/s
15:00 ☾
41% 12°C 0mm 45% 0cm 43° 25°C 0mm 1.7kPa 24135m 2.8m/s 1.5m/s
16:00 ☾
14% 12°C 0mm 50% 0cm 28° 23°C 0mm 1.4kPa 24134m 1m/s 0.66m/s
17:00 ☾
10% 13°C 0mm 54% 0cm 13° 22°C 0mm 1.3kPa 24135m 2.2m/s 1.3m/s
18:00 ☾
6% 13°C 0mm 60% 0cm -1.1° 21°C 0mm 0.99kPa 24135m 2.6m/s 1.3m/s
19:00 ☾
2% 13°C 0mm 73% 0cm -16° 18°C 0mm 0.54kPa 24135m 0.9m/s 0.91m/s
20:00 ☾
19% 13°C 0mm 76% 0cm -30° 17°C 0mm 0.47kPa 24135m 0.43m/s 0.35m/s
21:00 ☾
37% 12°C 0mm 74% 0cm -44° 17°C 0mm 0.51kPa 24134m 0.51m/s 0.4m/s
22:00 ☾
54% 12°C 0mm 67% 0cm -57° 19°C 0mm 0.72kPa 24135m 0.8m/s 0.7m/s
23:00 ☾
56% 12°C 0mm 63% 0cm -67° 20°C 0mm 0.83kPa 24134m 0.81m/s 0.69m/s
Fri, Apr 10 Sunrise 05:37 Sunset 17:57
24:00 ☾
57% 12°C 0mm 62% 0cm -70° 20°C 0mm 0.86kPa 24134m 0.6m/s 0.53m/s
01:00 ☾
59% 12°C 0mm 62% 0cm -63° 20°C 0mm 0.89kPa 24135m 0.61m/s 0.62m/s
02:00 ☾
65% 12°C 0mm 64% 0cm -52° 19°C 0mm 0.81kPa 24135m 0.9m/s 0.86m/s
03:00 ☾
72% 12°C 0mm 73% 0cm -38° 17°C 0mm 0.51kPa 24134m 1m/s 1.2m/s
04:00 ☾
78% 12°C 0mm 76% 0cm -24° 16°C 0mm 0.44kPa 24134m 0.9m/s 0.96m/s
05:00 ☾
80% 12°C 0mm 73% 0cm -9.9° 17°C 0mm 0.51kPa 24135m 0.71m/s 0.81m/s
06:00 ☾
82% 12°C 0mm 74% 0cm 4.8° 17°C 0mm 0.5kPa 24134m 0.81m/s 0.88m/s
07:00 ☾
84% 12°C 0mm 55% 0cm 19° 22°C 0mm 1.2kPa 24135m 1.4m/s 0.79m/s
08:00 ☾
85% 12°C 0mm 42% 0cm 34° 26°C 0mm 1.9kPa 24134m 2.3m/s 0.83m/s
09:00 ☾
87% 11°C 0mm 34% 0cm 49° 28°C 0mm 2.5kPa 24134m 2.5m/s 1m/s
10:00 ☾
88% 9.5°C 0mm 28% 0cm 63° 30°C 0mm 3.1kPa 24135m 2m/s 1.1m/s
11:00 ☾
83% 9.2°C 0mm 24% 0cm 78° 32°C 0mm 3.6kPa 24134m 1.5m/s 1.1m/s
12:00 ☾
78% 9.2°C 0mm 24% 0cm 85° 32°C 0mm 3.6kPa 24134m 1.8m/s 1.7m/s
13:00 ☾
73% 9.7°C 0mm 27% 0cm 72° 31°C 0mm 3.2kPa 24135m 2.7m/s 2.1m/s
14:00 ☾
49% 11°C 0.03mm 40% 0cm 57° 26°C 0mm 2kPa 24134m 2.4m/s 1.4m/s
15:00 ☾
26% 12°C 0mm 48% 0cm 43° 24°C 0mm 1.5kPa 24134m 1.5m/s 0.8m/s
16:00 ☾
2% 13°C 0mm 51% 0cm 28° 23°C 0mm 1.4kPa 24135m 0.41m/s 0.45m/s
17:00 ☾
2% 13°C 0mm 55% 0cm 13° 23°C 0mm 1.2kPa 24135m 0.9m/s 0.97m/s
18:00 ☾
1% 14°C 0mm 62% 0cm -1.1° 22°C 0mm 0.98kPa 24134m 1m/s 0.92m/s
19:00 ☾
1% 15°C 0mm 77% 0cm -16° 19°C 0mm 0.5kPa 24134m 0.7m/s 0.66m/s
20:00 ☾
20% 15°C 0mm 81% 0cm -30° 18°C 0mm 0.4kPa 24134m 0.32m/s 0.22m/s
21:00 ☾
38% 15°C 0mm 80% 0cm -44° 18°C 0mm 0.41kPa 24134m 0.5m/s 0.31m/s
22:00 ☾
57% 14°C 0mm 76% 0cm -57° 19°C 0mm 0.51kPa 24134m 0.73m/s 0.75m/s
23:00 ☾
60% 13°C 0mm 71% 0cm -67° 19°C 0mm 0.62kPa 24134m 0.84m/s 0.86m/s
Sat, Apr 11 Sunrise 05:37 Sunset 17:57
24:00 ☾
63% 13°C 0mm 68% 0cm -70° 19°C 0mm 0.71kPa 24135m 0.82m/s 0.8m/s
01:00 ☾
66% 13°C 0mm 68% 0cm -63° 19°C 0mm 0.69kPa 24135m 0.72m/s 0.8m/s
02:00 ☾
73% 13°C 0mm 72% 0cm -51° 18°C 0mm 0.58kPa 24135m 1.2m/s 1.2m/s
03:00 ☾
79% 13°C 0mm 77% 0cm -38° 17°C 0mm 0.46kPa 24134m 1m/s 1.1m/s
04:00 ☾
86% 14°C 0mm 80% 0cm -24° 17°C 0mm 0.39kPa 24135m 0.92m/s 1.1m/s
05:00 ☾
87% 14°C 0mm 86% 0cm -9.7° 16°C 0mm 0.26kPa 24134m 0.9m/s 0.96m/s
06:00 ☾
89% 14°C 0mm 84% 0cm 4.9° 17°C 0mm 0.31kPa 24135m 0.71m/s 0.78m/s
07:00 ☾
90% 14°C 0mm 61% 0cm 19° 22°C 0mm 1kPa 24134m 1.4m/s 0.91m/s
08:00 ☾
91% 13°C 0mm 44% 0cm 34° 26°C 0mm 1.9kPa 24134m 1.8m/s 0.75m/s
09:00 ☾
93% 12°C 0mm 35% 0cm 49° 29°C 0mm 2.5kPa 24134m 2m/s 0.37m/s
10:00 ☾
94% 11°C 0mm 29% 0cm 63° 31°C 0mm 3.1kPa 24135m 1.6m/s 0.04m/s
11:00 ☾
85% 11°C 0mm 27% 0cm 78° 32°C 0mm 3.6kPa 24135m 1.5m/s 0.8m/s
12:00 ☾
77% 11°C 0mm 28% 0cm 85° 32°C 0mm 3.3kPa 24135m 1.8m/s 1.4m/s
13:00 ☾
68% 12°C 0.02mm 39% 0cm 72° 27°C 0mm 2.2kPa 24135m 1.7m/s 1.5m/s
14:00 ☾
46% 15°C 0.01mm 57% 0cm 57° 24°C 0.04mm 1.3kPa 24135m 1.4m/s 1.3m/s
15:00 ☾
23% 16°C 0.007mm 74% 0cm 43° 21°C 0.08mm 0.64kPa 24135m 1.1m/s 1m/s
16:00 ☾
1% 16°C 0mm 92% 0cm 28° 18°C 0.13mm 0.17kPa 24135m 0.83m/s 0.76m/s
17:00 ☾
1% 16°C 0mm 91% 0cm 13° 17°C 0.13mm 0.18kPa 22975m 0.99m/s 0.97m/s
18:00 ☾
1% 16°C 0mm 91% 0cm -1.1° 17°C 0.13mm 0.18kPa 21814m 1.1m/s 1.2m/s
19:00 ☾
1% 15°C 0mm 90% 0cm -16° 17°C 0.13mm 0.19kPa 20654m 1.3m/s 1.4m/s
20:00 ☾
16% 16°C 0.003mm 88% 0cm -30° 18°C 0.1mm 0.23kPa 21745m 1.4m/s 1.3m/s
21:00 ☾
32% 16°C 0.007mm 87% 0cm -44° 18°C 0.08mm 0.28kPa 22835m 1.5m/s 1.2m/s
22:00 ☾
47% 16°C 0.01mm 85% 0cm -56° 19°C 0.06mm 0.32kPa 23926m 1.5m/s 1.1m/s
23:00 ☾
49% 16°C 0.01mm 81% 0cm -66° 19°C 0.08mm 0.43kPa 23996m 1.6m/s 1m/s
Sun, Apr 12 Sunrise 05:36 Sunset 17:57
24:00 ☾
52% 16°C 0.01mm 77% 0cm -69° 20°C 0.1mm 0.54kPa 24065m 1.6m/s 0.99m/s
01:00 ☾
54% 16°C 0.01mm 73% 0cm -63° 21°C 0.13mm 0.67kPa 24135m 1.6m/s 0.92m/s
02:00 ☾
64% 16°C 0.007mm 59% 0cm -51° 24°C 0.1mm 1.2kPa 24135m 1.6m/s 0.91m/s
03:00 ☾
74% 14°C 0.003mm 46% 0cm -38° 27°C 0.08mm 1.9kPa 24135m 1.6m/s 0.9m/s
04:00 ☾
84% 12°C 0mm 33% 0cm -24° 30°C 0.06mm 2.9kPa 24135m 1.6m/s 0.88m/s
05:00 ☾
86% 15°C 0.07mm 51% 0cm -9.6° 26°C 0.29mm 1.7kPa 18179m 1.9m/s 0.99m/s
06:00 ☾
88% 17°C 0.15mm 70% 0cm 5° 23°C 0.52mm 0.82kPa 12223m 2.1m/s 1.1m/s
07:00 ☾
90% 17°C 0.22mm 88% 0cm 20° 19°C 0.75mm 0.25kPa 6267m 2.4m/s 1.2m/s
08:00 ☾
90% 17°C 4.8mm 92% 0cm 34° 18°C 10mm 0.17kPa 5574m 3.1m/s 1.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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