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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
Visibility24135 (Clear)
Relative Humidity96%
Wind Speed1.3m/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
Dense Fog
Da Lat
Tomorrow · 01:00–05:00 · 4h window
High confidence
98%
🌫️Fog Probability100%
Dewpoint Spread: 0.3°C
Visibility: 1081 (Mist/Haze)
Relative Humidity: 98%
Wind Speed: 1.4m/s (calm conditions)
fog weather icon
Dense Fog at Sunrise
Da Lat
Tomorrow · 05:00–06:00
🌫️Fog Probability:99.5%
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
5matching 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
≥ 75.0%
Tue, Jul 7
21:0073%
22:0073%
23:0069%
Wed, Jul 8
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:0049%
09:0057%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:0071%
20:0071%
21:0055%
22:0055%
23:0071%
Thu, Jul 9
24:0071%
01:00100%
02:00100%
03:00100%
04:00100%
05:00100%
06:0046%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:0043%
20:0062%
21:000%
22:000%
23:000%
Fri, Jul 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%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sat, Jul 11
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%
14:0019%
15:000%
16:000%
17:000%
18:000%
19:000%
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
Wed, Jul 8 Sunrise 05:27 Sunset 18:14
21:00
0% 16°C 0mm 96% 0cm -36° 17°C 0mm 0.07kPa 24135m 3.3m/s 1.3m/s
22:00
0% 16°C 0mm 96% 0cm -46° 17°C 0mm 0.07kPa 24135m 2.6m/s 1.1m/s
23:00
0% 16°C 0mm 97% 0cm -53° 17°C 0mm 0.05kPa 24135m 3m/s 1.3m/s
Thu, Jul 9 Sunrise 05:27 Sunset 18:14
24:00
0% 16°C 0mm 98% 0cm -56° 17°C 0mm 0.04kPa 24135m 6.4m/s 1.5m/s
01:00
0% 16°C 0mm 98% 0cm -52° 16°C 0mm 0.03kPa 1081m 3.8m/s 1.4m/s
02:00
0% 16°C 0mm 98% 0cm -43° 16°C 0mm 0.04kPa 273m 7m/s 1.4m/s
03:00
0% 16°C 0mm 98% 0cm -32° 17°C 0mm 0.04kPa 155m 7.2m/s 1.3m/s
04:00
0% 17°C 0mm 97% 0cm -20° 17°C 0mm 0.05kPa 150m 7.7m/s 1.6m/s
05:00
0% 16°C 0mm 96% 0cm -7° 17°C 0mm 0.08kPa 302m 9.3m/s 1.8m/s
06:00
0% 16°C 0mm 95% 0cm 6.6° 17°C 0.06mm 0.1kPa 21626m 10m/s 2.1m/s
07:00
0% 16°C 0mm 90% 0cm 20° 18°C 0.06mm 0.2kPa 24135m 11m/s 2.2m/s
08:00
0% 15°C 0mm 74% 0cm 34° 20°C 0mm 0.58kPa 24135m 10m/s 3.4m/s
09:00
1% 15°C 0mm 65% 0cm 48° 21°C 0mm 0.89kPa 24135m 10m/s 4.3m/s
10:00
1% 15°C 0mm 60% 0cm 61° 23°C 0mm 1.1kPa 24134m 9.3m/s 4.3m/s
11:00
1% 16°C 0mm 61% 0cm 74° 24°C 0mm 1.1kPa 24134m 8.3m/s 4.3m/s
12:00
0% 16°C 0mm 64% 0cm 79° 24°C 0.06mm 1kPa 24134m 7.8m/s 4.1m/s
13:00
0% 17°C 0mm 67% 0cm 71° 23°C 0.19mm 0.92kPa 23890m 7.1m/s 3.5m/s
14:00
0% 17°C 0mm 71% 0cm 58° 22°C 0.13mm 0.79kPa 24135m 7.1m/s 3.3m/s
15:00
1% 17°C 0mm 80% 0cm 44° 21°C 0.25mm 0.48kPa 24134m 6.7m/s 3m/s
16:00
1% 18°C 0mm 88% 0cm 30° 20°C 0.38mm 0.28kPa 24135m 7m/s 2.2m/s
17:00
1% 16°C 0mm 80% 0cm 16° 20°C 0.44mm 0.48kPa 24134m 6.9m/s 2.6m/s
18:00
1% 17°C 0mm 92% 0cm 2.8° 18°C 0.44mm 0.17kPa 24135m 4.9m/s 1.6m/s
19:00
1% 16°C 0mm 98% 0cm -11° 17°C 0.5mm 0.03kPa 11465m 2.7m/s 1.5m/s
20:00
2% 17°C 0mm 97% 0cm -24° 17°C 0mm 0.06kPa 24134m 7.7m/s 1.7m/s
21:00
4% 16°C 0mm 94% 0cm -36° 17°C 0mm 0.12kPa 21307m 10m/s 2.3m/s
22:00
5% 16°C 0mm 92% 0cm -46° 17°C 0mm 0.15kPa 24135m 11m/s 2.6m/s
23:00
4% 16°C 0mm 93% 0cm -53° 17°C 0mm 0.14kPa 24134m 11m/s 2.7m/s
Fri, Jul 10 Sunrise 05:27 Sunset 18:14
24:00
3% 16°C 0mm 92% 0cm -56° 17°C 0mm 0.16kPa 24135m 12m/s 3.3m/s
01:00
2% 16°C 0mm 94% 0cm -52° 17°C 0.06mm 0.12kPa 24135m 12m/s 3.5m/s
02:00
3% 16°C 0mm 92% 0cm -43° 17°C 0mm 0.15kPa 24134m 13m/s 4m/s
03:00
4% 16°C 0mm 92% 0cm -33° 17°C 0mm 0.14kPa 21719m 13m/s 4m/s
04:00
5% 15°C 0mm 93% 0cm -20° 16°C 0mm 0.13kPa 24135m 13m/s 4.3m/s
05:00
4% 15°C 0mm 93% 0cm -7.1° 16°C 0mm 0.13kPa 24135m 14m/s 4.1m/s
06:00
3% 15°C 0mm 92% 0cm 6.5° 17°C 0mm 0.15kPa 24135m 14m/s 4.3m/s
07:00
2% 16°C 0mm 90% 0cm 20° 17°C 0mm 0.2kPa 24135m 14m/s 4.1m/s
08:00
2% 16°C 0mm 89% 0cm 34° 18°C 0mm 0.22kPa 21007m 14m/s 4m/s
09:00
1% 16°C 0mm 91% 0cm 48° 18°C 0mm 0.19kPa 494m 14m/s 4.2m/s
10:00
1% 17°C 0mm 92% 0cm 61° 18°C 0.06mm 0.16kPa 324m 14m/s 4m/s
11:00
1% 17°C 0mm 92% 0cm 74° 19°C 0.19mm 0.18kPa 1832m 13m/s 4m/s
12:00
0% 17°C 0mm 91% 0cm 80° 19°C 0.31mm 0.2kPa 2154m 13m/s 3.7m/s
13:00
0% 17°C 0mm 91% 0cm 71° 18°C 0.44mm 0.19kPa 24135m 13m/s 3.6m/s
14:00
0% 16°C 0mm 77% 0cm 58° 21°C 0.06mm 0.55kPa 24134m 13m/s 4.4m/s
15:00
0% 16°C 0mm 68% 0cm 44° 22°C 0.13mm 0.83kPa 24134m 13m/s 4.5m/s
16:00
0% 16°C 0mm 73% 0cm 30° 21°C 0.19mm 0.68kPa 24135m 12m/s 4.3m/s
17:00
1% 16°C 0mm 79% 0cm 16° 20°C 0.25mm 0.47kPa 24134m 13m/s 4.2m/s
18:00
2% 16°C 0mm 82% 0cm 2.8° 19°C 0.25mm 0.38kPa 24134m 13m/s 4m/s
19:00
3% 16°C 0mm 90% 0cm -11° 18°C 0.31mm 0.2kPa 24134m 12m/s 3.8m/s
20:00
6% 16°C 0mm 93% 0cm -24° 18°C 0mm 0.14kPa 24135m 13m/s 4m/s
21:00
10% 17°C 0.01mm 93% 0cm -36° 18°C 0.06mm 0.14kPa 24134m 13m/s 4.3m/s
22:00
13% 16°C 0mm 89% 0cm -46° 18°C 0.13mm 0.23kPa 24134m 15m/s 5.1m/s
23:00
10% 16°C 0mm 85% 0cm -54° 18°C 0.13mm 0.32kPa 24135m 14m/s 5.2m/s
Sat, Jul 11 Sunrise 05:28 Sunset 18:14
24:00
6% 16°C 0mm 90% 0cm -56° 18°C 0.19mm 0.2kPa 24135m 14m/s 5.1m/s
01:00
3% 17°C 0mm 94% 0cm -52° 18°C 0.19mm 0.12kPa 21171m 13m/s 4.5m/s
02:00
2% 17°C 0mm 92% 0cm -44° 18°C 0.19mm 0.17kPa 14839m 13m/s 4.6m/s
03:00
2% 17°C 0mm 90% 0cm -33° 18°C 0.19mm 0.22kPa 8507m 14m/s 4.6m/s
04:00
1% 17°C 0mm 88% 0cm -20° 19°C 0.19mm 0.27kPa 2175m 14m/s 4.6m/s
05:00
1% 17°C 0.003mm 88% 0cm -7.1° 19°C 0.29mm 0.26kPa 8626m 14m/s 4.4m/s
06:00
0% 17°C 0.007mm 88% 0cm 6.5° 19°C 0.4mm 0.26kPa 15078m 13m/s 4.2m/s
07:00
0% 17°C 0.01mm 89% 0cm 20° 19°C 0.5mm 0.25kPa 21530m 13m/s 3.9m/s
08:00
0% 17°C 0.007mm 90% 0cm 34° 19°C 0.54mm 0.22kPa 15246m 13m/s 4.1m/s
09:00
1% 17°C 0.003mm 91% 0cm 48° 19°C 0.58mm 0.19kPa 8963m 14m/s 4.4m/s
10:00
1% 17°C 0mm 92% 0cm 61° 19°C 0.63mm 0.16kPa 2679m 14m/s 4.6m/s
11:00
1% 17°C 0.02mm 93% 0cm 74° 18°C 0.75mm 0.14kPa 2366m 14m/s 4.7m/s
12:00
0% 17°C 0.05mm 94% 0cm 80° 18°C 0.88mm 0.13kPa 2054m 14m/s 4.8m/s
13:00
0% 17°C 0.07mm 95% 0cm 71° 18°C 1mm 0.11kPa 1741m 15m/s 4.9m/s
14:00
0% 17°C 0.05mm 94% 0cm 58° 17°C 0.73mm 0.11kPa 1835m 15m/s 5m/s
15:00
0% 16°C 0.03mm 94% 0cm 44° 17°C 0.46mm 0.12kPa 1930m 15m/s 5.2m/s
16:00
0% 16°C 0.01mm 94% 0cm 30° 17°C 0.19mm 0.12kPa 2025m 16m/s 5.3m/s
17:00
0% 16°C 0.01mm 94% 0cm 16° 17°C 0.21mm 0.13kPa 2383m 16m/s 5.3m/s
18:00
1% 16°C 0.02mm 93% 0cm 2.8° 17°C 0.23mm 0.13kPa 2742m 16m/s 5.4m/s
19:00
1% 16°C 0.02mm 93% 0cm -11° 17°C 0.25mm 0.13kPa 3101m 16m/s 5.5m/s
20:00
2% 16°C 0.01mm 93% 0cm -24° 17°C 0.19mm 0.13kPa 2162m 16m/s 5.3m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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