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Rule Fog Hunter

Da Nang - Fog Hunter - Vietnam

Da Nang, Da Nang, Vietnam

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread8.3°C
Visibility24135 (Clear)
Relative Humidity61%
Wind Speed3.3m/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 Nang
Thu, Apr 16 · 13:00–15:00 · 2h window
Low confidence
35%
🌫️Fog Probability65.8-82.7%
Dewpoint Spread: 0.1°C
Visibility: 3224 (Mist/Haze)
Relative Humidity: 99%
Wind Speed: 1.0m/s (calm conditions)
fog weather icon
Moderate Fog at Sunset
Da Nang
Thu, Apr 16 · 18:00–19:00
🌫️Fog Probability:75.8%
Medium
fog weather icon
Dense Fog
Da Nang
Thu, Apr 16 · 19:00–20:00
🌫️Fog Probability:88.6%
Medium
fog weather icon
Moderate Fog
Da Nang
Fri, Apr 17 · 15:00–17:00
🌫️Fog Probability:64.8-74.8%
Low
fog weather icon
Moderate Fog at Sunset
Da Nang
Fri, Apr 17 · 17:00–19:00
🌫️Fog Probability:70.7-75.8%
Low

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 95 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Ho_Chi_Minh
Fog Probability
≥ 60.0%
Wed, Apr 8
08:000%
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Thu, Apr 9
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Fri, Apr 10
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Sat, Apr 11
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Sun, Apr 12
24:000%
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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 05:36 Sunset 18:00
09:00
100% 20°C 0mm 61% 0cm 48° 28°C 0mm 1.5kPa 24135m 4m/s 3.3m/s
10:00
100% 20°C 0mm 56% 0cm 62° 29°C 0mm 1.8kPa 24135m 4.5m/s 4.5m/s
11:00
100% 20°C 0mm 55% 0cm 75° 30°C 0mm 1.8kPa 24135m 5.1m/s 6.4m/s
12:00
100% 22°C 0mm 67% 0cm 81° 28°C 0mm 1.3kPa 24134m 7.2m/s 8.1m/s
13:00
100% 23°C 0mm 73% 0cm 71° 28°C 0mm 1kPa 24134m 8.2m/s 7.4m/s
14:00
100% 23°C 0mm 75% 0cm 57° 28°C 0mm 0.93kPa 24134m 8.1m/s 6.6m/s
15:00
100% 23°C 0mm 75% 0cm 43° 28°C 0mm 0.91kPa 24135m 8.2m/s 6m/s
16:00
100% 23°C 0mm 77% 0cm 28° 27°C 0mm 0.84kPa 24134m 7.9m/s 5.2m/s
17:00
100% 23°C 0mm 78% 0cm 14° 27°C 0mm 0.76kPa 24135m 7.9m/s 4.9m/s
18:00
99% 23°C 0mm 83% 0cm -0.001° 26°C 0mm 0.57kPa 24135m 5.6m/s 3.8m/s
19:00
99% 22°C 0mm 84% 0cm -15° 25°C 0mm 0.51kPa 24135m 4.4m/s 2.9m/s
20:00
94% 22°C 0mm 85% 0cm -29° 25°C 0mm 0.48kPa 24135m 3.9m/s 2.6m/s
21:00
90% 22°C 0mm 85% 0cm -42° 25°C 0mm 0.46kPa 24134m 4.3m/s 2.8m/s
22:00
85% 21°C 0mm 84% 0cm -54° 24°C 0mm 0.5kPa 24135m 3m/s 2.1m/s
23:00
85% 21°C 0mm 79% 0cm -63° 24°C 0mm 0.65kPa 24134m 2.5m/s 2.1m/s
Fri, Apr 10 Sunrise 05:36 Sunset 18:00
24:00
84% 19°C 0mm 73% 0cm -66° 25°C 0mm 0.85kPa 24134m 2.7m/s 2.4m/s
01:00
84% 19°C 0mm 71% 0cm -60° 25°C 0mm 0.9kPa 24135m 3.5m/s 2.9m/s
02:00
86% 19°C 0mm 73% 0cm -50° 24°C 0mm 0.83kPa 24135m 3.7m/s 3.1m/s
03:00
87% 20°C 0mm 76% 0cm -37° 24°C 0mm 0.73kPa 24134m 3.6m/s 2.9m/s
04:00
89% 19°C 0mm 75% 0cm -23° 24°C 0mm 0.76kPa 24134m 3.2m/s 2.8m/s
05:00
90% 19°C 0mm 73% 0cm -9.3° 24°C 0mm 0.83kPa 24135m 3.2m/s 2.9m/s
06:00
91% 19°C 0mm 68% 0cm 5.1° 25°C 0mm 1kPa 24134m 4m/s 3.3m/s
07:00
92% 19°C 0mm 67% 0cm 19° 26°C 0mm 1.1kPa 24135m 3.7m/s 3m/s
08:00
94% 20°C 0mm 61% 0cm 34° 28°C 0mm 1.4kPa 24134m 5.3m/s 4.1m/s
09:00
97% 20°C 0mm 55% 0cm 48° 30°C 0mm 1.9kPa 24134m 5.8m/s 4.2m/s
10:00
99% 20°C 0mm 52% 0cm 62° 31°C 0mm 2.2kPa 24135m 5.2m/s 4.3m/s
11:00
99% 21°C 0mm 55% 0cm 76° 31°C 0mm 2kPa 24134m 4.4m/s 4.9m/s
12:00
100% 22°C 0mm 67% 0cm 81° 29°C 0mm 1.3kPa 24134m 6.8m/s 7.2m/s
13:00
100% 23°C 0mm 74% 0cm 71° 28°C 0mm 0.98kPa 24135m 7m/s 6.2m/s
14:00
94% 23°C 0mm 74% 0cm 57° 28°C 0mm 0.98kPa 24134m 7.4m/s 6.2m/s
15:00
89% 23°C 0mm 76% 0cm 43° 28°C 0mm 0.87kPa 24134m 7.1m/s 5.4m/s
16:00
83% 23°C 0mm 77% 0cm 28° 28°C 0mm 0.84kPa 24135m 7.5m/s 5.1m/s
17:00
79% 24°C 0mm 80% 0cm 14° 27°C 0mm 0.74kPa 24135m 5.7m/s 3.9m/s
18:00
75% 24°C 0mm 83% 0cm 0.03° 27°C 0mm 0.58kPa 24134m 3.8m/s 2.7m/s
19:00
71% 23°C 0mm 84% 0cm -15° 26°C 0mm 0.55kPa 24134m 3.3m/s 2.2m/s
20:00
71% 23°C 0mm 83% 0cm -29° 26°C 0mm 0.57kPa 24134m 3.1m/s 2.4m/s
21:00
70% 23°C 0mm 83% 0cm -42° 26°C 0mm 0.58kPa 24134m 2.5m/s 1.9m/s
22:00
70% 22°C 0mm 81% 0cm -54° 26°C 0mm 0.63kPa 24134m 1.5m/s 1.1m/s
23:00
72% 21°C 0mm 75% 0cm -63° 26°C 0mm 0.82kPa 24134m 2.4m/s 2.2m/s
Sat, Apr 11 Sunrise 05:35 Sunset 18:01
24:00
75% 20°C 0mm 69% 0cm -66° 26°C 0mm 1kPa 24135m 2.5m/s 2.4m/s
01:00
77% 19°C 0mm 67% 0cm -60° 26°C 0mm 1.1kPa 24135m 3.3m/s 3m/s
02:00
83% 20°C 0mm 69% 0cm -49° 26°C 0mm 1kPa 24135m 3.6m/s 3.2m/s
03:00
88% 20°C 0mm 72% 0cm -37° 26°C 0mm 0.92kPa 24134m 3.7m/s 3.2m/s
04:00
94% 20°C 0mm 74% 0cm -23° 25°C 0mm 0.84kPa 24135m 3.6m/s 3.1m/s
05:00
95% 20°C 0mm 75% 0cm -9.1° 25°C 0mm 0.79kPa 24134m 3.7m/s 3.1m/s
06:00
97% 20°C 0mm 76% 0cm 5.2° 25°C 0mm 0.77kPa 24135m 4m/s 3.4m/s
07:00
98% 21°C 0mm 72% 0cm 19° 26°C 0mm 0.95kPa 24134m 4.1m/s 3.2m/s
08:00
99% 21°C 0mm 65% 0cm 34° 28°C 0mm 1.3kPa 24134m 4.8m/s 3.9m/s
09:00
99% 20°C 0mm 54% 0cm 48° 31°C 0mm 2kPa 24134m 5.9m/s 4m/s
10:00
100% 20°C 0mm 48% 0cm 62° 33°C 0mm 2.5kPa 24135m 6.1m/s 3.8m/s
11:00
100% 21°C 0mm 52% 0cm 76° 32°C 0mm 2.3kPa 24135m 5m/s 3.3m/s
12:00
100% 23°C 0mm 63% 0cm 82° 30°C 0mm 1.6kPa 24135m 6m/s 6.4m/s
13:00
100% 24°C 0mm 78% 0cm 71° 28°C 0mm 0.84kPa 24135m 7.8m/s 7.1m/s
14:00
88% 22°C 0mm 77% 0cm 57° 26°C 0mm 0.8kPa 24135m 5.5m/s 5.1m/s
15:00
77% 21°C 0mm 76% 0cm 43° 25°C 0mm 0.75kPa 24135m 3.2m/s 3m/s
16:00
65% 19°C 0mm 76% 0cm 28° 24°C 0mm 0.71kPa 24135m 0.93m/s 0.98m/s
17:00
66% 18°C 0mm 71% 0cm 14° 24°C 0mm 0.86kPa 24135m 1.1m/s 1.2m/s
18:00
67% 18°C 0mm 67% 0cm 0.07° 24°C 0mm 1kPa 24135m 1.3m/s 1.4m/s
19:00
68% 17°C 0mm 62% 0cm -15° 25°C 0mm 1.2kPa 24135m 1.5m/s 1.7m/s
20:00
70% 17°C 0mm 62% 0cm -28° 24°C 0mm 1.2kPa 24135m 1.4m/s 1.6m/s
21:00
72% 17°C 0mm 62% 0cm -42° 24°C 0mm 1.2kPa 24135m 1.3m/s 1.4m/s
22:00
74% 17°C 0mm 62% 0cm -54° 24°C 0mm 1.2kPa 24135m 1.2m/s 1.3m/s
23:00
78% 16°C 0mm 57% 0cm -63° 25°C 0mm 1.4kPa 24135m 2.5m/s 1.7m/s
Sun, Apr 12 Sunrise 05:34 Sunset 18:01
24:00
82% 16°C 0mm 53% 0cm -65° 27°C 0mm 1.6kPa 24135m 3.7m/s 2m/s
01:00
86% 16°C 0mm 48% 0cm -60° 28°C 0mm 1.9kPa 24135m 5m/s 2.4m/s
02:00
90% 16°C 0mm 41% 0cm -49° 31°C 0mm 2.6kPa 24135m 4.5m/s 2.4m/s
03:00
95% 15°C 0mm 33% 0cm -36° 34°C 0mm 3.5kPa 24135m 4m/s 2.4m/s
04:00
99% 14°C 0mm 26% 0cm -23° 37°C 0mm 4.6kPa 24135m 3.5m/s 2.4m/s
05:00
99% 15°C 0mm 26% 0cm -9° 37°C 0mm 4.7kPa 24135m 3.8m/s 2.9m/s
06:00
100% 15°C 0mm 26% 0cm 5.4° 38°C 0mm 4.9kPa 24135m 4.2m/s 3.3m/s
07:00
100% 16°C 0mm 26% 0cm 20° 39°C 0mm 5kPa 24135m 4.5m/s 3.8m/s
08:00
100% 18°C 0mm 35% 0cm 34° 36°C 0mm 3.9kPa 24135m 4.2m/s 3.4m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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