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Rule Fog Hunter

San José - Fog Hunter - Costa Rica

San José, Provincia de San José, Costa Rica

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread2.3°C
Visibility7989 (Moderate)
Relative Humidity87%
Wind Speed2.5m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Costa_Rica
fog weather icon
Next opportunity
Dense Fog
San José
Today · 23:00–04:00 · 5h window
High confidence
95%
🌫️Fog Probability98.5-100%
Dewpoint Spread: 0.8°C
Visibility: 898 (Fog)
Relative Humidity: 95%
Wind Speed: 2.0m/s (calm conditions)
fog weather icon
Dense Fog at Dawn
San José
Tomorrow · 04:00–05:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog at Sunrise
San José
Tomorrow · 05:00–06:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
San José
Tomorrow · 06:00–07:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
San José
Tomorrow · 19:00–01:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
San José
Sat, Jul 11 · 21:00–01:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
San José
Wed, Jul 15 · 21:00–01:00
🌫️Fog Probability:77.1-100%
Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts when cloud forest conditions and valley fog create atmospheric scenes across Costa Rica's diverse elevations and microclimates. We track elevation-specific humidity, temperature differentials, and wind patterns to identify when fog and mist transform rainforest, cloud forest, and volcanic landscapes.

Costa Rica's dramatic topography creates numerous fog microclimates—from Monteverde's perpetual cloud forest mist to volcanic valley inversions to Caribbean coastal morning fog. The collision of Pacific and Caribbean weather systems over mountainous terrain produces exceptional fog photography opportunities year-round, with green season (May-November) bringing the most dramatic conditions.

What makes Costa Rica fog photography special:

  • Cloud forest immersion - Monteverde's permanent fog layer supports epiphyte-draped forests where mist is the defining feature, not occasional visitor
  • Volcanic valley fog - Arenal and Turrialba valleys fill with morning fog while volcanic peaks emerge above inversion layers
  • Microclimate transitions - Experience multiple fog types in single day—cloud forest, valley fog, coastal mist across short distances
  • Jungle emergence - Rainforest canopy trees and cecropia emerging from morning fog layers create layered atmospheric compositions

Monteverde cloud forest reserve exists because of fog—the persistent cloud layer that supports one of Earth's most biodiverse ecosystems. Here, photography captures fog as environment, with epiphytes, bromeliads, and moss-draped trees emerging from perpetual mist. The suspended bridges offer unique elevated perspectives into the fog layer. From La Fortuna, Arenal Volcano's perfect cone rises above valley fog on calm mornings, especially during green season. Turrialba Valley experiences similar inversions with the active volcano emerging above fog pools. Rincón de la Vieja's volcanic slopes create altitude-based fog layers with fumaroles adding volcanic steam to natural mist. Best conditions occur during green season when humidity is highest—arrive early as valley fog often dissipates by 8-9 AM.

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72-hour requirements breakdown

What passed or failed, hour by hour
17matching hours in the next 79 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Costa_Rica
Fog Probability
≥ 75.0%
Tue, Jul 7
23:0099%
Wed, Jul 8
24:0086%
01:0078%
02:0069%
03:0072%
04:0072%
05:0072%
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%
22:0067%
23:0099%
Thu, Jul 9
24:00100%
01:00100%
02:00100%
03:00100%
04:00100%
05:00100%
06:00100%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:00100%
20:00100%
21:00100%
22:00100%
23:00100%
Fri, Jul 10
24:00100%
01:0067%
02:0069%
03:0067%
04:0067%
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%
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
America/Costa_Rica
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 05:21 Sunset 18:01
07:00
0% 17°C 0mm 87% 0cm 22° 19°C 0mm 0.29kPa 7989m 4.4m/s 2.5m/s
08:00
1% 17°C 0mm 78% 0cm 36° 21°C 0mm 0.53kPa 8056m 4.1m/s 2.4m/s
09:00
1% 16°C 0mm 68% 0cm 49° 22°C 0mm 0.86kPa 24135m 3.8m/s 2.6m/s
10:00
1% 16°C 0mm 62% 0cm 63° 24°C 0.06mm 1.1kPa 24135m 3.4m/s 2.6m/s
11:00
2% 17°C 0mm 60% 0cm 74° 25°C 0.19mm 1.3kPa 24135m 3.2m/s 2.8m/s
12:00
2% 17°C 0mm 64% 0cm 77° 25°C 0.31mm 1.1kPa 23921m 2.8m/s 2.8m/s
13:00
2% 18°C 0mm 65% 0cm 67° 25°C 0.38mm 1.1kPa 24134m 2.5m/s 2.6m/s
14:00
2% 18°C 0mm 74% 0cm 55° 23°C 1mm 0.74kPa 18687m 2.7m/s 2.4m/s
15:00
2% 18°C 0mm 78% 0cm 41° 22°C 1.8mm 0.6kPa 23596m 2.9m/s 2.5m/s
16:00
1% 18°C 0mm 80% 0cm 27° 22°C 2mm 0.51kPa 21594m 2.9m/s 2.3m/s
17:00
1% 17°C 0mm 84% 0cm 13° 20°C 2.1mm 0.37kPa 4062m 3.1m/s 2.2m/s
18:00
0% 17°C 0mm 94% 0cm 0.11° 18°C 2.3mm 0.13kPa 21050m 3.3m/s 1.9m/s
19:00
0% 17°C 0mm 94% 0cm -14° 18°C 0mm 0.11kPa 8073m 3.5m/s 1.7m/s
20:00
0% 16°C 0mm 87% 0cm -27° 18°C 0.06mm 0.27kPa 4722m 3.4m/s 2m/s
21:00
0% 16°C 0mm 90% 0cm -39° 18°C 0.06mm 0.22kPa 4304m 3.5m/s 1.9m/s
22:00
0% 17°C 0mm 96% 0cm -49° 17°C 0.13mm 0.08kPa 3317m 3.5m/s 1.8m/s
23:00
0% 17°C 0mm 98% 0cm -56° 17°C 0.13mm 0.05kPa 1802m 3.8m/s 2.1m/s
Thu, Jul 9 Sunrise 05:21 Sunset 18:01
24:00
0% 17°C 0mm 95% 0cm -57° 17°C 0.13mm 0.09kPa 898m 4m/s 2m/s
01:00
0% 17°C 0mm 96% 0cm -52° 18°C 0mm 0.09kPa 693m 3.9m/s 2m/s
02:00
0% 17°C 0mm 96% 0cm -43° 18°C 0mm 0.07kPa 1278m 3.8m/s 1.9m/s
03:00
0% 17°C 0mm 98% 0cm -32° 17°C 0.06mm 0.04kPa 743m 3.6m/s 1.8m/s
04:00
0% 17°C 0mm 98% 0cm -19° 17°C 0.06mm 0.04kPa 625m 3.8m/s 2m/s
05:00
0% 17°C 0mm 97% 0cm -5.6° 17°C 0.13mm 0.06kPa 662m 3.9m/s 1.9m/s
06:00
0% 17°C 0.01mm 96% 0cm 8.1° 18°C 0.19mm 0.08kPa 680m 4.3m/s 2.2m/s
07:00
0% 17°C 0mm 91% 0cm 22° 19°C 0.06mm 0.2kPa 1252m 4m/s 2.3m/s
08:00
0% 17°C 0mm 87% 0cm 36° 20°C 0.13mm 0.3kPa 1836m 4.1m/s 2.4m/s
09:00
0% 18°C 0mm 82% 0cm 49° 21°C 0.25mm 0.44kPa 3850m 4m/s 2.4m/s
10:00
0% 18°C 0.01mm 72% 0cm 63° 23°C 0.69mm 0.77kPa 5144m 3.5m/s 2.4m/s
11:00
0% 18°C 0mm 71% 0cm 74° 23°C 1.3mm 0.84kPa 20919m 3.5m/s 2.8m/s
12:00
0% 18°C 0mm 77% 0cm 77° 22°C 2.3mm 0.63kPa 6162m 3.3m/s 2.7m/s
13:00
0% 19°C 0mm 79% 0cm 68° 22°C 1.6mm 0.55kPa 3960m 3.4m/s 2.6m/s
14:00
0% 19°C 0mm 85% 0cm 55° 21°C 3.6mm 0.38kPa 3353m 3.6m/s 2.6m/s
15:00
0% 18°C 0mm 88% 0cm 41° 20°C 4.6mm 0.29kPa 1171m 3.6m/s 2.3m/s
16:00
0% 18°C 0mm 92% 0cm 27° 19°C 5mm 0.17kPa 1132m 3.6m/s 2.2m/s
17:00
0% 18°C 0.04mm 96% 0cm 13° 19°C 5.2mm 0.09kPa 592m 3.7m/s 2m/s
18:00
0% 18°C 0.09mm 98% 0cm 0.12° 18°C 5.4mm 0.04kPa 426m 3.6m/s 1.7m/s
19:00
0% 18°C 0mm 98% 0cm -14° 18°C 0.06mm 0.05kPa 543m 4.5m/s 2m/s
20:00
0% 17°C 0mm 99% 0cm -27° 17°C 0.13mm 0.03kPa 524m 4.2m/s 2m/s
21:00
0% 17°C 0mm 98% 0cm -39° 18°C 0.13mm 0.05kPa 1020m 4m/s 2m/s
22:00
0% 17°C 0mm 97% 0cm -49° 17°C 0.13mm 0.05kPa 1332m 3.4m/s 1.8m/s
23:00
0% 17°C 0mm 97% 0cm -56° 17°C 0.13mm 0.06kPa 816m 2.9m/s 1.7m/s
Fri, Jul 10 Sunrise 05:21 Sunset 18:01
24:00
0% 17°C 0mm 96% 0cm -58° 17°C 0.13mm 0.08kPa 859m 2.8m/s 1.5m/s
01:00
0% 16°C 0mm 96% 0cm -53° 17°C 0mm 0.08kPa 3949m 2.7m/s 1.6m/s
02:00
0% 16°C 0mm 96% 0cm -43° 17°C 0mm 0.08kPa 1342m 3.1m/s 1.6m/s
03:00
0% 17°C 0mm 96% 0cm -32° 17°C 0mm 0.08kPa 3577m 3m/s 1.5m/s
04:00
0% 17°C 0mm 96% 0cm -19° 17°C 0.06mm 0.07kPa 4012m 2.4m/s 1.3m/s
05:00
0% 16°C 0mm 94% 0cm -5.7° 17°C 0.06mm 0.12kPa 4418m 2.9m/s 1.7m/s
06:00
0% 16°C 0mm 92% 0cm 17°C 0.13mm 0.16kPa 7957m 2.9m/s 1.7m/s
07:00
0% 16°C 0mm 89% 0cm 22° 18°C 0.06mm 0.23kPa 7781m 3.2m/s 1.9m/s
08:00
0% 17°C 0mm 85% 0cm 36° 19°C 0.06mm 0.33kPa 15110m 3.4m/s 2m/s
09:00
0% 17°C 0mm 77% 0cm 49° 21°C 0.19mm 0.56kPa 20184m 3.6m/s 2.2m/s
10:00
0% 17°C 0mm 71% 0cm 63° 22°C 0.31mm 0.79kPa 24135m 3.2m/s 2.3m/s
11:00
0% 17°C 0mm 67% 0cm 74° 23°C 0.63mm 0.93kPa 24135m 3.1m/s 2.5m/s
12:00
0% 17°C 0mm 69% 0cm 77° 23°C 1.3mm 0.88kPa 8677m 2.7m/s 2.5m/s
13:00
0% 17°C 0mm 79% 0cm 68° 21°C 1.3mm 0.53kPa 6117m 2.9m/s 2.2m/s
14:00
0% 17°C 0mm 89% 0cm 55° 19°C 1.3mm 0.25kPa 3556m 3.2m/s 2m/s
15:00
0% 17°C 0mm 99% 0cm 41° 17°C 1.4mm 0.02kPa 996m 3.4m/s 1.7m/s
16:00
0% 17°C 0.02mm 99% 0cm 27° 17°C 1.7mm 0.02kPa 1022m 3.2m/s 1.6m/s
17:00
0% 17°C 0.03mm 99% 0cm 13° 17°C 2mm 0.02kPa 1048m 2.9m/s 1.5m/s
18:00
0% 17°C 0.05mm 99% 0cm 0.13° 17°C 2.4mm 0.02kPa 1074m 2.6m/s 1.4m/s
19:00
0% 17°C 0.03mm 99% 0cm -14° 17°C 2.6mm 0.02kPa 1520m 2.4m/s 1.4m/s
20:00
0% 16°C 0.02mm 99% 0cm -27° 17°C 2.8mm 0.03kPa 1966m 2.2m/s 1.4m/s
21:00
0% 16°C 0mm 98% 0cm -39° 17°C 3.1mm 0.03kPa 2412m 2m/s 1.4m/s
22:00
0% 16°C 0.04mm 98% 0cm -49° 17°C 3.8mm 0.04kPa 5468m 1.8m/s 1.3m/s
23:00
0% 16°C 0.08mm 98% 0cm -56° 17°C 4.5mm 0.05kPa 8525m 1.6m/s 1.1m/s
Sat, Jul 11 Sunrise 05:22 Sunset 18:01
24:00
0% 16°C 0.12mm 97% 0cm -58° 17°C 5.3mm 0.05kPa 11581m 1.3m/s 1m/s
01:00
0% 17°C 0.08mm 95% 0cm -53° 17°C 3.7mm 0.09kPa 11896m 1.9m/s 1.3m/s
02:00
0% 17°C 0.04mm 94% 0cm -43° 18°C 2.1mm 0.13kPa 12211m 2.5m/s 1.6m/s
03:00
0% 17°C 0mm 92% 0cm -32° 19°C 0.56mm 0.17kPa 12527m 3.1m/s 1.9m/s
04:00
0% 17°C 0.03mm 93% 0cm -19° 18°C 1.5mm 0.16kPa 8902m 3m/s 1.9m/s
05:00
0% 17°C 0.06mm 93% 0cm -5.7° 18°C 2.5mm 0.14kPa 5278m 2.9m/s 1.9m/s
06:00
0% 17°C 0.09mm 94% 0cm 18°C 3.5mm 0.13kPa 1653m 2.7m/s 1.9m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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